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CODE OF PRACTICE

ON

SEWERAGE AND SANITARY WORKS

1stEdition- Mar 2000

Addend! No" 1-Fe# 2001

Addend! No" 2$ No% 200&

Water Re'(a!ation )Net*or+, Deart!ent

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Sin.aore

)T/is Code o Pra'ti'e is #(is/ed on t/e P We#siteat R3 Address/tt455***"#".o%"s.,
http://www.pub.gov.sg/http://www.pub.gov.sg/http://www.pub.gov.sg/

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Code o Pra'ti'e on Sanitar6 P(!#in. and Draina.e S6ste!

(Ceased publication since Mar 2000)

1st EDITION MAR 19!

2nd

EDITION A"R 19#$%rd EDITION &E' 19901st RE"RINT E" 19922nd RE"RINT A* 199$%rd RE"RINT MA+ 199!$t, RE"RINT MA+ 199

ADDENDMNO-1

E" 199

Se*era.e Pro'edres and Re7ire!ents

(Ceased publication since Mar 2000)

1st EDITION MAR 19!#2nd EDITION MA+ 19$1st RE"RINT MA+ 19.2nd RE"RINT DEC 19.%rd EDITION NO/ 19!$t, EDITION A"R 19#1%rd RE"RINT DEC 19#..t, EDITION AN 19#$t, RE"RINT &E' 19#9.t, RE"RINT OCT 1991!t, RE"RINT N 199$t, RE"RINT 199!

Code o Pra'ti'e on Se*era.e and Sanitar6 Wor+s

1st EDITION MAR 2000ADDENDM

NO- 1&E' 2001

ADDENDMNO- 2

NO/ 200$

)3ast date4 No% 200&,

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ONSEWERAGE AND SANITARY WORKS

CONTENTS

Page

Introd'tion (7i)

Ter!ino(o.6 (7ii)

PART 1 P3ANNING 9 DESIGN RE:IREMENTSFOR DE;E3OPMENT WORKS

1

1-1 Introd'tion 1

1-2 P(annin. Re7ire!ents1

PART 2 SEWERAGE WORKS $

2-1 Desi.n Re7ire!ents For Se*ers $

2-1-1 Ob?ecti7e $

2-1-2 Desi4n &lo8 $

2-1-% i@e $

2-1-$ "er5issible /elocities and *rades $

2-1-. Materials .

2-1-! e8er ections .

2-1- e8er 5an,oles .

2-1-# Ot,er Appurtenances !

2-1-9 e8er oints and Connections !

2-1-10 e8er "ipe ac3in4 Operations

(ii)

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Page

2-1-11 Testin4 o6 ater;ti4,tness o6 se8ers(Addendum No.1-Feb 2001)

2-1-12 *ood e8er and "u5pin4 Mains a>in4 "ractice (Addendum No.1-Feb 2001)

2-2 Desi.n Re7ire!ents For P!in. Mains #

2-2-1 Mini5u5 i@e #

2-2-2 Mini5u5 and Mai5u5 "er5issible /elocities #

2-2-% Materials #

2-2-$ "u5pin4 Main ection 9

2-2-. Appurtenances 9

2-2-! Testin4 o6 "u5pin4 Mains

(Addendum No.1-Feb 2001)9

2-2- *ood e8er and "u5pin4 Mains a>in4 "ractice (Addendum No.1-Feb 2001)

9

2-% Re7ire!ents For Se*a.e Treat!ent P(ant 10

2-%-1 Introduction 10

2-%-2 Capacit> o6 e8a4e Treat5ent "lant 10

2-%-% ocation o6 e8a4e Treat5ent "lant 11

2-%-$ ,ieldin4 o6 e8a4e Treat5ent "lant 12

2-%-. eparate "lot and &encin4 12

2-%-! Outlet 6or &inal E66luent 12

2-%- Te5porar> eptic Tan3 1%

2-%-# Desi4n *uideline 6or e8a4e Treat5ent "lants 1%

2-$ Me'/ani'a( 9 E(e'tri'a( )M 9 E, Re7ire!ents ForSe*era.e Insta((ations

1!

2-$-1 Mec,anical ReBuire5ents 1!

(iii)

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Page

2-$-2 Electrical ReBuire5ents 19

PART < SANITARY WORKS 22

%-1 Sanitar6 Draina.e S6ste! 22

%-1-1 Ob?ecti7e 22

%-1-2 Desi4n Criteria 22

%-1-% Acceptable Desi4n"ractice 2%

%-1-$ Material and Co5ponent 2#

%-2 Sanitar6 P(!#in. S6ste! 29

%-2-1 Ob?ecti7e 29

%-2-2 Desi4n Criteria 29

%-2-% Acceptable Desi4n"ractice %0

%-2-$ Material and Co5ponent %%

%-% Sanitar6 A(ian'es And Fittin.s %$

%-%-1 Ob?ecti7e %$

%-%-2 electionDesi4n Criteria %$

%-%-% Acceptable practices on Installation o6 anitar>Appliances

%.

%-%-$ ,allo8 &loor Trap 6or "re6abricated Toilet nit %9

%-%-. Material and Co5ponent %9

%-$ Standard Dra*in.s For Sanitar6 Wor+s $0

PART & 3IST OF STANDARD DRAWINGS

A;AI3A3E FOR DOWN3OAD FROM PWESITE

!#

(i7)

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Page

PART = 3IST OF ANNE>ES(Addendum No.1-Feb 2001)

0

ANNE> A - GOOD SEWER AND PMPING

MAINS 3AYING PRACTICE(Addendum No.1-Feb 2001)

0

ANNE> - STANDARD DRAWING FORPRO;ISION OF AD;ANCECONNECTIONS TO 3OTONDARIES FOR SEWERDI;ERSION WORK(Addendum No.1-Feb 2001)

$

A33 WORK PROCEDRES AND FORMS ARE A;AI3A3E IN T?EP WESITEAT R3 ADDRESS4 ,ttp:888-pub-4o7-s4

(7)
http://www.pub.gov.sg/http://www.pub.gov.sg/

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INTRODCTION

in4apore is c,aracterised b> abundant rain6all ,i4, te5perature and ,u5idit>-

Coupled 8it, ,i4, population densit> 8aterborne diseases can spread easil> and

Buic3l> unless a ,i4, standard o6 public ,ealt, is 5aintained- "roper collectiontreat5ent and disposal o6 do5estic and industrial 8aste8ater is t,ere6ore necessar> to

pre7ent t,e pollution o6 8atercourses reser7oirs ri7ers and t,e sea and t,us t,e

spread o6 diseases-

In in4apore do5estic and industrial 8aste8ater is collected and con7e>ed b>

se8ers to se8a4e treat5ent 8or3s 6or treat5ent be6ore 6inal disc,ar4e into t,e sea-

ence it is essential t,at adeBuate care and precaution be ta3en to ensure t,at ne8

de7elop5ent 8or3s do not a66ect t,e eistin4 se8era4e s>ste5- It is also i5portant

t,at t,e sanitar> and se8era4e s>ste5 t,at are to be pro7ided to ser7e ne8

de7elop5ents are desi4ned and constructed properl> to 5aintain t,e e66ecti7eness o6

t,e entire se8era4e s>ste5-

T,is Code o6 "ractice on e8era4e and anitar> or3s is issued under ection

%% o6 t,e e8era4e and Draina4e Act (C,apter 29$)- It ai5s to 4uide t,e uali6ied

"ersons in t,e proper plannin4 and desi4n o6 t,e sanitar> and se8era4e s>ste5- In

stipulatin4 onl> t,e 5ini5u5 and 5andator> desi4n reBuire5ents to be co5plied 8it,

it is ,oped t,at t,e uali6ied "ersons 8ill eercise 6leibilit> and creati7it> in t,e desi4n

o6 sanitar> and se8era4e s>ste5 8it,out co5pro5isin4 on 6unctional and 5aintenance

needs- In addition to t,e 5ini5u5 reBuire5ents so5e 4ood en4ineerin4 practices in

t,e plannin4 desi4n and construction o6 t,e sanitar> and se8era4e s>ste5 are also

4i7en in t,is code-

Dire'torWater Re'(a!ation )Net*or+, Deart!entP#(i' ti(ities oardSin.aore

(7i)

TERMINO3OGY

@Centra( i(din. P(an re6ers to t,e Central 'uildin4 "lan nit o6 t,e "lannin4 and

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nit )CP, De7elop5ent Depart5ent National En7iron5ent A4enc>(NEA)F

@Deart!ent re6ers to t,e ater Recla5ation (Net8or3) Depart5ent (RN)o6 t,e "ublic tilities 'oard ("')F

(Addendum No.2-Nov 2004)

@dis'/ar.e ie 5eans a pipe 8,ic, con7e>s t,e disc,ar4es 6ro5 a sanitar>appliance or a 6loor trapF

@dis'/ar.e sta'+ 5eans a 5ain 7ertical disc,ar4e pipeF

@drain-(ine 5eans an> pipe 8,ic, is connected to t,e se8era4e s>ste5F

@ittin.s 5eans an> apparatus or parts used 6or an> sanitar> 6acilit> ordrain;line o6 an> pre5isesF

@#(i' se*era.e s6ste! includes;(a) se8era4e s>ste5 8,ic, 8ere 7ested in t,e *o7ern5ent

be6ore t,e appointed da> under t,e repealed ater "ollution

Control and Draina4e Act (Cap- %$#) or an> ot,er 8rittenla8F

(b) se8era4e s>ste5s 8it, respect to 8,ic, a declaration o67estin4 ,as been 5ade under ection 9 o6 t,e e8era4e andDraina4e ActF

(c) se8era4e s>ste5s constructed b> t,e *o7ern5ent or t,e"ublic tilities 'oard on be,al6 o6 t,e *o7ern5ent on an>

pri7ate propert> at t,e epense o6 t,e *o7ern5ent oracBuired b> t,e *o7ern5entF and

(d) se8era4e s>ste5s constructed on an> pri7ate propert> and5aintained b> t,e "ublic tilities 'oardF

@#(i' se*er includes;(a) se8ers 8,ic, 8ere 7ested in t,e *o7ern5ent be6ore t,e

appointed da> under t,e repealed ater "ollution Controland Draina4e Act (Cap- %$#) or an> ot,er 8ritten la8F

(b) se8ers 8it, respect to 8,ic, a declaration o6 7estin4 ,asbeen 5ade under ection 10 o6 t,e e8era4e and Draina4eActF

(c) se8ers constructed b> t,e *o7ern5ent or t,e "ublictilities 'oard on be,al6 o6 t,e *o7ern5ent on an> pri7ate

propert> at t,e epense o6 t,e *o7ern5ent or acBuired b>t,e *o7ern5entF and

(d) se8ers constructed on an> pri7ate propert> and 5aintained

b> t,e "ublic tilities 'oardF

@7a(iied erson in relation to an> se8era4e 8or3s 5eans a Buali6ied personappointed under section !(%) or 9(2)(b) o6 t,e 'uildin4 ControlAct (Cap- 29) in respect o6 8or3s 8,ic, include t,e se8era4e8or3s and t,ose 8,ose Buali6ication is appropriate to t,enature o6 t,ose 8or3sF

(7ii)

@sanitar6 a(ian'es includes 8as, basins bat, tubs sin3s urinals toilet bo8ls andot,er appliances 8,ic, connect directl> or ot,er8ise to a

pri7ate se8a4e treat5ent plant or a public se8era4e s>ste5F

@sanitar6 draina.e 5eans a net8or3 o6 under4round pipes co5prisin4 drain;lines

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s6ste! branc, drain;lines 6ittin4s and inspection c,a5bers 6or t,econ7e>ance o6 se8a4e 8it,in an> pre5ises to a se8era4es>ste5F

@sanitar6 a'i(ities includes bat,roo5s toilets 6acilities 6or 8as,in4 and sanitar>appliances to4et,er 8it, t,e associated pipe;8or3 8,et,erabo7e or belo8 t,e 4round 8,ic, connect directl> orot,er8ise to a pri7ate se8a4e treat5ent or a public se8era4e

s>ste5F

@sanitar6 (!#in.s6ste!

5eans a s>ste5 o6 sanitar> pipe8or3 abo7e t,e 4roundco5prisin4 one or 5ore disc,ar4e pipes disc,ar4e stac3s7entilatin4 pipes 7entilatin4 stac3s and 6ittin4s 6or t,econ7e>ance o6 se8a4e 6ro5 pre5ises to a sanitar> draina4es>ste5F

@sanitar6 *or+s include 8or3s on an> sanitar> plu5bin4 s>ste5 or sanitar>draina4e s>ste5 and t,e 6iin4 alteration and repair o6 asanitar> appliance and ot,er 8or3s connected t,ere8it,F

@seti' tan+ 5eans a tan3 t,rou4, 8,ic, se8a4e 6lo8s and t,e depositedor4anic 5atter is 8,oll> or partiall> bro3en do8nanaerobicall>F

@se*a.e includes 8ater;borne do5estic 8aste and trade e66luentF

@se*a.e treat!ent (ant re6ers to se8a4e treat5ent 8or3s septic tan3 i5,o66 tan3percolatin4 6ilter slud4e di4estion tan3 or an> tan3 desi4ned 6ort,e pretreat5ent treat5ent or t,e stabilisation o6 se8a4e

@se*era.e s6ste! 5eans a s>ste5 o6 se8ers pu5pin4 5ains pu5pin4 stationsse8a4e treat5ent plants and treat5ent 8or3s 6or t,e collection

treat5ent and disposal o6 se8a4e and reco7er> o6 industrial8ater and includes an> industrial 8ater 5ain and pipe drain;line 4rease trap cesspit septic tan3 pri7> and an>appurtenance t,ereo6F

@se*era.e *or+s includes en4ineerin4 8or3s 6or t,e construction alteration and5aintenance o6 an> se8era4e s>ste5F

@%enti(atin. ie 5eans a pipe pro7ided to li5it t,e pressure 6luctuations 8it,inan> sanitar> plu5bin4 s>ste5F

@%enti(atin. sta'+ 5eans a 5ain 7ertical 7entilatin4 pipe-

(7iii)

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Code of Practice on Sewerage and Sanitary Works (1 stEdition Mar 2000) (Updated:o! 200")

PART 1

P3ANNING 9 DESIGN RE:IREMENTSFOR DE;E3OPMENT WORKS

1"1 INTRODCTION

It is essential t,at adeBuate 5easures are ta3en durin4 t,e plannin4 desi4n and constructiono6 all ne8 buildin4 and in6rastructure de7elop5ents to ensure t,at t,e> do not a66ect orunder5ine t,e inte4rit> o6 t,e eistin4 se8era4e s>ste5- It is also i5portant t,at 4ooddesi4n and en4ineerin4 practices are adopted in t,e plannin4 desi4n and construction o6ne8 sanitar> drain;lines and se8ers to ensure t,at t,e> can per6or5 e66ecti7el> and 8it,5ini5al 5aintenance-

1"2 P3ANNING RE:IREMENTS

1-2-1 All ne8 de7elop5ents s,all be ser7ed b> an internal sanitar> plu5bin4 and draina4es>ste5- T,is internal sanitar> plu5bin4 and draina4e s>ste5 s,all be connected to publicse8ers b> an internal drain;line 5aintained b> t,e o8ner or occupier o6 t,e de7elop5ent-In t,e plannin4 and desi4n o6 t,e internal drain;line and its connection to t,e public se8erst,e 6ollo8in4 reBuire5ents s,all be co5plied 8it,:

(a) A de7elop5ent s,all 5a3e use o6 t,e eistin4 se8er connection t,at is located 8it,int,e de7elop5ent site- I6 an eistin4 connection is not a7ailable t,e connection s,all be5ade to t,e nearest public se8er as ad7ised b> t,e Depart5ent-

(b) &or ,i4, densit> ,ousin4 de7elop5ents suc, as condo5iniu5s and apart5ents t,e

internal drain;lines s,all be connected to t,e public se8ers 7ia 5an,oles-

(c) &or sin4le unit ,ousin4 de7elop5ent t,e drain;line connection can be 5ade to t,epublic se8ers 7ia raised ?unction or G+H ?unction connections- In t,is case t,e lastinspection c,a5ber 8it,in t,e de7elop5ent site s,all be located not 5ore t,an 2-.5a8a> 6ro5 t,e de7elop5ent boundar>-

(d) ,ere a ne8 5inor se8er is laid to pic3 up 6lo8 6ro5 t,e drain;lines 6ro5 a ro8 o6sin4le unit ,ousin4 de7elop5ent t,e ne8 se8er can also be connected to t,e publicse8er 7ia raised ?unction or G+H ?unction connections sub?ect to t,e 6ollo8in4 criteria:

(i) t,e last 5an,ole t,at is located 8it,in t,e last ,ousin4 unit s,all not be 5ore t,an.05 a8a> 6ro5 t,e point o6 connection-

(ii) t,e connectin4 se8er 6ro5 t,e last 5an,ole to t,e eistin4 se8er s,all6ollo8 t,e si@e o6 t,e eistin4 se8er or 20055 dia5eter 8,ic,e7er iss5aller- T,e ne8 5inor se8er upstrea5 o6 t,e last 5an,ole s,all ,o8e7erre5ain at t,e 5ini5u5 si@e o6 20055 dia5eter- (Note: &or connectionto an eistin4 se8er 7ia a 5an,ole t,e connection se8er 6ro5 t,e last5an,ole s,all also be 20055 dia5eter- T,is is re4ardless o6 t,e si@e o6t,e eistin4 se8er)-

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(iii) Onl> up to 10 sin4le unit ,ousin4 de7elop5ent is allo8ed to be connected to t,epublic se8er 7ia ?unction connections- ,en t,ere are 5ore t,an 10 units in t,ero8 o6 ,ousin4 de7elop5ent t,e ne8 5inor se8er s,all be connected to t,eeistin4 se8er 7ia a 5an,ole-

(e) In t,e e7ent 8,en one o6 t,e units alon4 a ro8 o6 sin4le unit ,ousin4 de7elop5ent

proposes to carr> out etension 8or3 8,ic, in7ol7es di7ersion o6 se8er si5ilar to t,edesi4n la>out as s,o8n in t,e Dra8in4 No- .;1 in Anne ' o6 "art . t,e proposed se8erdi7ersion 8or3 5ust include ad7ance connections to t,e lot boundaries- T,e pipe endsare to be sealed as part o6 t,e se8er di7ersion 8or3- (Addendum No.1-Feb 2001)

1-2-2 It is essential t,at t,e se8ers s,all re5ain readil> accessible at all ti5es so t,at an>5aintenance 8or3s to t,e se8ers can be carried out epeditiousl>- &or t,is no buildin4 orstructure s,all be allo8ed to be erected o7er and across an> se8ers-

(a) 'uildin4 and structure s,all 5ean an> structural ele5ents suc, as per5anent etensionto eistin4 buildin4s balconies retainin4 8alls boundar> 8alls o7er,ead brid4es etc-

(b) Ee5ption to t,is reBuire5ent s,all onl> be applicable to structures t,at do not 6or5an inte4ral part o6 t,e buildin4 and 8,ic, are li4,t and easil> re5o7able suc, asa8nin4s plantin4 trou4,s co7ered lin38a>s co5pound drains etc-

(c) In addition buildin4 or erection o6 structures o7er and across 5inor se8ers 5a> beallo8ed on t,e condition t,at t,e buildin4 structures are 5odi6ied or desi4ned suc, t,att,e se8ers re5ain accessible 6or 5aintenance belo8 t,e structures- T,e desi4n o6 t,estructures 5a> include t,e erection o6 a trenc, t,at encloses and >et allo8 6ree accessto t,e se8ers- T,e trenc, s,all be desi4ned to 5eet t,e 6ollo8in4 reBuire5ents:

(i) It s,all be 5ade o6 rein6orced concrete or ot,er sturd> 5aterial-

(ii) "ro7ision s,all be 5ade to allo8 access into t,e trenc, 7ia t,e top suc, asre5o7able pre;cast concrete slabs or ot,er ,ard co7ers-

(iii) T,e 5ini5u5 8idt, o6 t,e trenc, s,all be .055 to allo8 a 5an to 8or3 8it,in-&or 5inor se8ers t,at are 5ore t,an %5 deep t,e 8idt, o6 t,e trenc, reBuireds,all be as ad7ised b> t,e Depart5ent-

(i7) T,e trenc, s,all be bac36illed 8it, sand or ot,er appro7ed 4ranular 5aterials-

1-2-% All buildin4s or structures s,all be erected a8a> 6ro5 se8erspu5pin4 5ains-o8e7er i6 t,ere is a need to build near se8ers or pu5pin4 5ains adeBuateseparation distance s,all be pro7ided bet8een t,e structures and t,e

se8erspu5pin4 5ains as 6ollo8s:

(a) All buildin4s and structures s,all be built at t,e 6ollo8in4 5ini5u5 lateral distancesa8a> 6ro5 se8ers:

Se*er SiBe)!! dia!eter,

Se*er Det/)!,

Mini!! Distan'e)!,

1.0 to !00 %

% and .

.

1-01-.2-0

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(b) All buildin4s and structures s,all be built at t,e 6ollo8in4 5ini5u5 lateral distancesa8a> 6ro5 pu5pin4 5ains:

P!in. Main SiBe)!! dia!eter,

P!in. Main Det/)!,

Mini!! Distan'e)!,

100 to !00 % % and .

.

1-01-.2-0

(c) T,e 5ini5u5 distances s,all be 5easured 6ro5 t,e outer 5ost ed4e o6 t,e buildin4structure includin4 6ootin4s and o7er,an4s to t,e centreline o6 t,e se8erpu5pin45ain-

(i) In t,e e7ent t,at t,e 5ini5u5 distances cannot be 5et an access trenc, to t,e

se8erpu5pin4 5ain as stated in clause 1-2-2 (c) s,all be pro7ided-

(ii) &or 5ain se8ers and pu5pin4 5ains t,at are 4reater t,an !0055 in dia5eter t,e5ini5u5 separation distance reBuired s,all be as ad7ised b> t,e Depart5ent-

1-2-$ In t,e plannin4 desi4n and construction o6 an> de7elop5ent it is 7ital to ,a7e a clear3no8led4e o6 t,e eistin4 se8era4e s>ste5 i6 an> 8it,in t,e de7elop5ent site- A t,orou4,in7esti4ation o6 t,e de7elop5ent site s,all be carried out to deter5ine t,e eistin4 se8era4es>ste5 8it,in t,e site and all practical 5easures s,all be ta3en to ensure t,at t,e proposedde7elop5ent 8ill not disrupt or a66ect an> se8erdrain;line t,at is ser7in4 ad?acentlotspre5ises-

1.2.5 As far as possible, sewerage works shall be carried out within the limitof the development site. If there is a need to lay sewers and to carryout the sewerage works beyond the limit of the development site, thedeveloper shall obtain the consent from the owner of the land on whichthe sewerage works is to be carried out. This shall include tate !andor any other land that is managed by other "overnment Agencies.

1.2.# $or an e%isting or a new sewer that is located within a development

site, the owner of the site shall allow future connection to the sewerwithin the site as and when re&uired by 'epartment.

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PART 2

SEWERAGE WORKS

2"1 DESIGN RE:IREMENTS FOR SEWERS

2"1"1 O#e'ti%e

e8ers s,all be planned and desi4ned to be as si5ple and as direct as practicable 6ore66ectual con7e>ance o6 se8a4e- T,e> s,all also be laid at t,e correct 4rade usin4 appro7ed5aterials to ensure 5ini5al 5aintenance reBuire5ent and 5ai5u5 durabilit>-

2"1"2 Desi.n F(o*

T,e desi4n 6lo8 is based on t,e a5ount o6 se8a4e disc,ar4ed per person- T,e a7era4e

do5estic se8a4e dail> 6lo8 s,all be ta3en as 2%0 litres per person per da> 6or public,ousin4 and %$. litres per person per da> 6or pri7ate ,ousin4- T,e desi4n 6lo8 s,all be %ti5es t,e a7era4e 6lo8 i-e- !90 litres per person per da> and 10%. litres per person per da>respecti7el>- A sin4le d8ellin4 unit s,all be ta3en to co5prise . persons-

2"1"< SiBe

T,e 5ini5u5 si@e o6 all ne8 se8ers s,all be 20055 in dia5eter- T,e onl> eception to t,isreBuire5ent is 6or ?unction connections into eistin4 5inor se8ers t,at are 1.055 india5eter- In suc, cases t,e connectin4 ne8 se8er 6ro5 t,e last inspection c,a5ber or5an,ole o6 a ne8 de7elop5ent site s,all 6ollo8 t,e si@e o6 t,e eistin4 1.055 dia5eter

se8ers- In all ot,er cases t,e se8ers s,all not be s5aller t,an 20055 in dia5eter-

2"1"& Per!issi#(e ;e(o'ities and Grades

a) T,e 5ini5u5 and 5ai5u5 7elocities and 4rades o6 t,e 20055 dia5eter se8er6lo8in4 6ull s,all be as 6ollo8s:

JTA'EJTA'E

F(o*'ondition

Mini!!%e(o'it6

Mini!!Grade

Mai!!%e(o'it6

Mai!!Grade

al6 'ore 0-# 5s 1 in 2.0 2-$ 5s 1 in %0

al6 'ore 0-9 5s 1 in 120 2-$ 5s 1 in 20

JTA'ET,e uali6ied "erson is ,o8e7er ad7ised not to use t,e li5itin4 4radients in ,is se8erdesi4n so as to allo8 6or tolerance durin4 construction- &or s5all de7elop5ent sitessuc, as sin4le unit de7elop5ents s5all condo5iniu5s and 6actories se8a4e 6lo8 isli3el> to be lo8- In suc, cases ne8 se8ers includin4 t,e last connectin4 se8ers 6ort,ese de7elop5ents s,all be laid at a 5ini5u5 4rade o6 1 in 120- T,is is to pre7entt,e se8a4e in t,e se8ers 6ro5 turnin4 septic under lo8 6lo8 condition- &or lar4ede7elop5ents t,e uali6ied "erson s,all deter5ine t,e appropriate 4radient to ac,ie7et,e 5ini5u5 4radient 6or t,e se8ers 6ro5 ,is 6lo8 calculations-

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b) T,e 5ini5u5 and 5ai5u5 7elocities in se8ers abo7e 20055 dia5eter 6lo8in4 6ulls,all not be less t,an 0-# 5sec or 5ore t,an 2-$ 5sec-

JTA'E

2"1"= Materia(s

All 5aterials used 6or se8er pipes s,all con6or5 to t,e 6ollo8in4 reBuire5ents:

(a) /itri6ied Cla>All 7itri6ied cla> pipes and 6ittin4s s,all co5pl> 8it, EN 29.- T,e crus,in4 stren4t, o67itri6ied cla> pipes laid b> open trenc, 5et,od s,all not be less t,an t,e 7alues 6orClass nu5ber 1!0 as 4i7en in table . in EN 29.- /itri6ied cla> pipes 6or5icrotunnellin4 or pipe ?ac3in4 s,all also co5pl> 8it, t,e sa5e standard ,o8e7er t,ecrus,in4 stren4t, o6 t,e 7itri6ied cla> pipes s,all not be less t,an t,e 7alues 6or Classnu5ber 2$0-

(b) Ductile ironAll ductile iron pipes and 6ittin4s s,all co5pl> 8it, EN .9#- T,e> s,all be internall>lined 8it, ,i4, alu5ina ce5ent (AC) 5ortar in accordance 8it, EN .9# or

alternati7el> sulp,ate resistin4 ce5ent (RC) t,at co5pl> 8it, t,e t>pe test 6orc,e5ical resistance and abrasion resistance as speci6ied in EN .9# 6or AC- T,e>s,all also be eternall> coated 8it, a la>er o6 5etallic @inc and co7ered b> a 6inis,in4o6 a bitu5inous coatin4-

(c) T,ic38all Rein6orced ConcreteAll t,ic38all rein6orced concrete pipes s,all ,a7e an internal sacri6icial la>er o6 %#55in addition to t,e nor5al co7er 6or rein6orce5ent as pro7ided 6or in t,e desi4n o6rein6orced concrete pipes and in co5pliance 8it, 1#%-

(d) "/C or D"E ined Rein6orced ConcreteAll "/C or D"E lined rein6orced concrete pipes s,all be 5anu6actured in

co5pliance 8it, 1#% and s,all be internall> lined 8it, a 5ini5u5 t,ic3ness o61-.55 "/C or D"E linin4- T,e linin4 s,all be 6ied to t,e concrete sur6ace b>

5ec,anical 3e>s and co7er not less t,an %%0 o6 t,e internal circu56erence o6 t,e

pipes-

2"1" Se*er Se'tionsJTA'E

All se8ers laid in open trenc,es s,all be properl> protected and bac36illed 8it, appro7edbac36illin4 5aterials- Dependin4 on t,e 4round conditions and t,e t>pe o6 t,e se8er5aterial used t,e se8er s,all be laid in accordance to $ 5ain section t>pes 7i@- T>pe GAHT>pe G'H T>pe GCH and T>pe GDH- T,e details o6 t,ese sections can be 6ound in t,eDepart5ent Hs tandard Dra8in4s- &or section t>pe t,at reBuires concrete ,aunc,in4 t,e

concrete s,all be placed ri4,t to t,e sides o6 t,e eca7ation-

JTA'E2"1" Se*er Man/o(es

(a) All se8er 5an,oles s,all be constructed usin4 pre;cast circular units or c,a5ber rin4sin co5pliance 8it, t,e Depart5entHs tandard Details o6 Man,oles- T,ese details are6ound in t,e appropriate tandard Dra8in4s produced b> t,e Depart5ent-

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(b) &or 5an,oles t,at eceed 10-.5 in dept, special rein6orced concrete c,a5bers s,allbe constructed- T,e desi4n o6 t,ese c,a5bers s,all be carried out b> a uali6ied"erson and t,e details s,all be sub5itted to t,e Depart5ent 6or appro7al prior toco55ence5ent o6 8or3-

(c) T,e 5ini5u5 dept, o6 5an,oles 5easured 6ro5 t,e top o6 t,eir co7ers to t,eirin7erts s,all be 1-. 5etres-

(d) T,e distance bet8een 5an,oles s,all not be 5ore t,an 1205-

(e) T,e underside o6 all inter5ediate plat6or5s and roo6 slabs o6 5an,oles c,a5berss,all be lined 8it, "/C or D"E linin4-

(6) All 5an,ole 6ra5es and co7ers s,all be o6 t,e t>pe appro7ed b> t,e Depart5ent and

s,all co5pl> 8it, %0- T,ese appro7ed standard 5an,ole 6ra5es and co7ers ares,o8n in t,e Depart5entKs tandard Dra8in4s-

JTA'E JTA'E2"1" Ot/er Artenan'es

(a) 'ac3drop

A bac3drop connection to 5an,oles s,all be pro7ided 8,en t,e inco5in4 se8er is5ore t,an 1-.5 ,i4,er t,an t,e recei7in4 se8er-

(b) Tu5blin4 'a>

,en t,e inco5in4 se8er is less t,an 1-.5 ,i4,er t,an t,e recei7in4 se8er a tu5blin4ba> s,all be pro7ided-

(c) /orte Drop

,en t,e di66erence in le7els bet8een t,e inco5in4 and t,e out4oin4 se8ers is 5oret,an !5 at a 5an,ole a 7orte drop s,all be pro7ided- /orte drop s,all also be

pro7ided 6or se8ers t,at are 5ore t,an $.055 dia5eter- T,is is re4ardless o6 t,edi66erence in le7els bet8een t,e inco5in4 and out4oin4 se8ers-

(d) T,e standard desi4n 6or t,e bac3drops tu5blin4 ba>s and 7orte drops can be 6oundin t,e Depart5entHs tandard Dra8in4s- &or bac3drops and tu5blin4 ba>s t,einco5in4 se8ers s,all be laid suc, t,at t,e 7elocit> o6 t,e 6lo8 8it,in 8ill not eceed1-2 5sec to pre7ent se8a4e 6ro5 s,ootin4 t,rou4, t,e drop pipes- &or 20055dia5eter se8er t,e 5ai5u5 4rade s,all not eceed 1:120-

2"1"H Se*er oints and Conne'tions

(a) All se8er pipes s,all be connected usin4 appro7ed 6leible ?oints-

(b) All se8er pipes connectin4 to 5an,oles s,all be ?oined at so66it le7els- In t,e case o6 ane8 20055 dia5eter se8er connectin4 to an eistin4 1.055 dia5eter se8erdo8nstrea5 t,e connection s,all be 5ade at in7ert le7els at t,e 5an,ole-

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(c) All connection points 8,ere se8er pipes are built into 5an,ole 8alls s,all be 5ade8aterti4,t- No lea3s s,all be per5itted at t,ese points-

(d) e8er pipes connectin4 at t,e sa5e le7els at 5an,oles s,all not 6or5 acute an4les 8it,t,e pipes t,at lead a8a> 6ro5 t,e 5an,oles- T,e c,annels and t,e benc,in4 in t,e5an,oles s,all be s5oot,l> rendered to reduce turbulence in t,e se8a4e 6lo8-

2"1"10 Se*er Pie a'+in. Oerations

(a) Onl> appro7ed 7itri6ied cla> ?ac3in4 pipes and precast concrete rein6orced pipes s,allbe used 6or ?ac3in4- &or precast concrete pipes t,e> s,all be 5anu6actured b> acentri6u4al or ot,er eBui7alent process and s,all co5pl> 8it, t,e --1#% '--..!A--1%$2 or ot,er acceptable tandards-

(b) T,e ?oints o6 t,e se8er pipes s,all be 5ade o6 t,e double spi4ot t>pe- T,e ?ointin4slee7es s,all be 5ade o6 tainless teel T>pe %1!- "ressure trans6er rin4s s,all also beattac,ed to t,e 6ace o6 one o6 t,e spi4ot ends be6ore ?ointin4-

(c) ac3in4 operations s,all onl> be carried out b> s3illed pipe ?ac3in4 contractors andusin4 proper pipe ?ac3in4 eBuip5ent-

(d) A ?ac3in4 rin4 and a ?ac3in4 6ra5e s,all be used in all ?ac3in4 operations- T,e ?ac3in4rin4 s,all be desi4ned to allo8 t,e ?ac3in4 pressure to be distributed e7enl> around t,e8all o6 t,e ?ac3in4 pipes- i3e8ise t,e ?ac3in4 6ra5e s,all be desi4ned to distributet,e stresses 6ro5 t,e ?ac3s e7enl> onto t,e ?ac3in4 rin4-

(e) T,e 5ai5u5 tolerance allo8able in t,e displace5ent o6 t,e centreline o6 t,e ?ac3edpipe 6ro5 t,e desi4n centreline is .055 in t,e ,ori@ontal plane and 2.55 in t,e7ertical plane- T,ere s,all be no bac36all at an> point alon4 t,e se8er laid-

2"1"11 Testin. o Water-ti./tness o Se*ers (Addendum No.1-Feb 2001)

)a, All se8ers belo8 !00 55 in dia5eter be6ore bein4 surrounded and co7ered s,all betested b> 6illin4 8it, 8ater- T,e pressure s,all be 5easured 6ro5 t,e ,i4,est point o6t,e pipeline under test and s,all be 1-. 5etre ,ead o6 8ater- "ipelines s,ould not beaccepted until t,e> ,a7e 8it,stood t,e reBuired pressure 6or %0 5inutes 8it,out a lossin ecess o6 1-. litres 6or 100 5 6or eac, %00 55 in dia5eter-

(b) e8ers o6 !00 55 and abo7e in dia5eter need not be ,>draulicall> tested- T,e> s,allbe inspected b> CCT/ inspection or 6or 5an;entr> se8ers 5anual inspection s,all be

carried out-

2"1"12 Good se*er and !in. !ains (a6in. ra'ti'e (Addendum No.1-Feb 2001)

T,e 4uide on 4ood se8er and pu5pin4 5ains la>in4 practice is at "art .-

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JTA'E2"2 DESIGN RE:IREMENTS FOR PMPING MAINS

JTA'E2"2"1 Mini!! SiBe

T,e 5ini5u5 si@e o6 pu5pin4 5ain s,all be 10055 dia5eter-JTA'E

2"2"2 Mini!! and Mai!! ;e(o'ities Per!issi#(e

T,e 5ini5u5 and 5ai5u5 7elocities in pu5pin4 5ains s,all be 1-05sec and 2-$5secrespecti7el>- JTA'E

2"2"< Materia(s

All pu5pin4 5ains s,all be 5ade o6 ductile iron and s,all con6or5 8it, t,e 6ollo8in4reBuire5ents:

(i) All ductile iron pipes and 6ittin4s 6or pu5pin4 5ains s,all be internall> lined 8it,sulp,ate resistin4 ce5ent and coated eternall> 8it, 5etallic @inc coatin4 and 8it,

bitu5inous coatin4 as a 6inis,in4 coat all in accordance 8it, EN .9#-

(ii) Ductile iron pipes 8it, spi4ot and soc3et ?oints s,all be class and eternall>coated 8it, rilsan n>lon to protect a4ainst corrosion- T,e t,ic3ness o6 t,e rilsann>lon 6inis,in4 coat s,all not be less t,an %00 5icrons-

(7i) T,e pu5pin4 5ains s,all be 8rapped around 8it, 4reen pol>et,elene slee7esbe6ore la>in4- All pipe ?oints s,all be 8rapped 8it, 8aterproo6 8rappin4 tape o7era len4t, o6 !0055 be6ore slee7in4- T,e pol>et,elene slee7es and 1.055 8ide8ater proo6in4 tape s,all be used to pro7ide continuous protection o6 t,e pipes and6ittin4s- T,e slee7es s,all also be 6ree 6ro5 tears and pin,oles and ot,ercontinuities- T,e no5inal t,ic3ness o6 t,e slee7es s,all not be less t,an 2005icrons-

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(7ii) ,ere direct pipe ?ac3in4 is adopted t,e outside sur6ace o6 t,e ductile iron pipes,all be co7ered 8it, rein6orced concrete- T,e pipes s,all be connected b> 5eans o66leible ?oints 8,ic, 5a> be ?ointed b> bolts- T,e bolts s,all be desi4ned to brea3to ac,ie7e 6leibilit> in t,e ?oints-

JTA'E2"2"& P!in. Main Se'tion

(a) "u5pin4 5ains s,all in 4eneral be laid on 4ranular beddin4 i-e- T>pe A ection(see tandard Dra8in4s on 'eddin4 T>pe) ecept at 7er> s,allo8 sections suc, asat t,rust bloc3s and at ri7er crossin4s or 8,en t,e pu5pin4 5ains are laid b>direct ?ac3in4 or 5icrotunnellin4-

(b) T,rust bloc3s s,all be pro7ided at all bends alon4 t,e pu5pin4 5ains-

(c) T,e 5ini5u5 dept, o6 a pu5pin4 5ain 5easured to its in7ert s,all be 1-. 5etres-

2"2"= Artenan'es

(i) All pu5pin4 5ains s,all be pro7ided 8it, access c,a5bers 7ents air 7al7es and8as,out c,a5bers-

(ii) Access c,a5bers s,all be pro7ided alon4 t,e pu5pin4 5ain 6or 5aintenancepurposes- T,e distance bet8een t,e access c,a5bers s,all not be 5ore t,an 2005apart-

(iii) Air 7al7es s,all be installed in c,a5ber at all ,i4, points alon4 t,e pu5pin4 5ain-T,e air 7al7e s,all be o6 t,e dual ori6ice t>pe and co5e co5plete 8it, isolatin4

7al7es- T,e 7al7e s,all be 4as ti4,t at at5osp,eric pressure-

(i7) as,;out c,a5bers s,all be pro7ided at all t,e lo8est points alon4 t,e pu5pin45ain-

2"2" Testin. o P!in. Mains (Addendum No.1-Feb 2001)

All pu5pin4 5ains o6 !00 55 or less in dia5eter s,all be tested ,>draulicall> incon7enient len4t,s be6ore bein4 co7ered up- T,e test pressure s,all be 1-2 N552 6or allclasses o6 pipes-

2"2" Good se*er and !in. !ains (a6in. ra'ti'e (Addendum No.1-Feb 2001)

T,e 4uide on 4ood se8er and pu5pin4 5ains la>in4 practice is at "art .-

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2"< RE:IREMENTS FOR SEWAGE TREATMENT P3ANT

2" o6 t,e se8a4e treat5ent plant s,all be inaccordance 8it, t,e 6ollo8in4 sc,edule:

JTA'EJTA'E

No o /oses or residentia( nits Caa'it6 o (ant

1;2 10 persons

%;$ 20 persons

. = abo7e . persons per residential unit

JTA'EJTD(b) &or t,e speci6ic t>pe o6 de7elop5ent listed t,e 6ollo8in4 6actorss,all be used in ascertainin4 t,e capacit> o6 t,e se8a4e treat5ent plant-

JTA'E

T6e o De%e(o!ent Fa'tor

JTA'Ei)

C,urc,: all ; eatin4 capacit>

No o6 Residential ta66

0-01

1-00

ii) c,ool: "ri5ar> = econdar> c,ool; No o6 students and sta66 persession

0-2.

ii) Institution o6i4,er earnin4

No o6 students and sta66 0-.0

i7) Co55unit>Centre:

No o6 sta66 and 8or3ers

No o6 residents

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T6e o De%e(o!ent Fa'tor

7) &actor>: No o6 or3ers ;

One s,i6t per 2$ ,ours

T8oT,ree s,i6ts per 2$,ours-

0-.0

1-00

7i) Mar3et: No o6 ,a83ers ande5plo>ees

0-2.

7ii) a83er Coo3ed&ood Centre:

No o6 stalls 1-.

7iii) Cine5a: all ; seatin4 capacit>

No o6 sta66

0-0%

0-.0

i) 'ar = nac3'arCo66ee;ouseRestaurant:

eatin4 capacit> 0-20

) otel: No- o6 beds

No o6 sta66

0-0

0-.0

i) O66ice: No o6 sta66 0-.0

ii) "ar3 Mai5u5 no o6 personsepected to use t,e par3

0-02

JTA3E2"

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TA3E A4 MINIMM DISTANCE ETWEEN SEWAGETREATMENT P3ANTS AND NEAREST

I3DINGS

JTA'E

JTDCaa'it6 o Se*era.eTreat!ent P(ant )e7i%a(ent

ersons,

JTDMini!! C(earan'e inMetres

JTDRe!ar+s

JTD JTD JTD

JTD10 ; $0 JTD; JTD

JTD.0 ; 100 JTD10 ; 1. JTD

JTD200 JTD20 JTD

JTD%00 JTD2. JTD

JTD$00 JTD%0 JTD

JTD.00 JTD%. JTD

JTD!00 ; 2000 JTD%. ; $0 JTD

JTDAbo7e 2000 JTD; JTDDistance 8ill depend on

t,e desi4n o6 t,e treat5ent8or3s

JTA'E2"pe o6 6ence 5a> beerected 6or aest,etical reasons- ,ere a se8a4e treat5ent plant is to be located 8it,in a6enced area o6 a de7elop5ent ee5ption 5a> be 4i7en 6or t,e erection o6 t,e 6ence- T,eo8ner or t,e occupier o6 t,e de7elop5ent ,o8e7er s,all be responsible 6or t,e securit>o6 t,e plant and its eBuip5ent-

2"

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)

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JTD(b)

T,e uali6ied "erson s,all ensure t,at t,ere is a suitable 8atercourse in t,e7icinit> o6 t,e se8a4e treat5ent plant 6or t,e disc,ar4e o6 t,e 6inal e66luent at t,e

plannin4 sta4e- T,e disc,ar4e point 6or t,e 6inal e66luent s,all be clearl>indicated in t,e detailed plans-

2" s,all be:'ioc,e5ical O>4en De5and ('OD.) : 20 5illi4ra5s per litreuspended olids () : %0 5illi4ra5s per litre

('OD. is de6ined as t,e 'ioc,e5ical O>4en De5and o6 t,e e66luent in . da>s

5easured at 20C)-

T,e se8a4e treat5ent plant s,all ,a7e slud4e treat5ent and pre;disposal stora4e6acilities- T,e 5et,ods o6 treat5ent and disposal o6 t,e 6inal e66luent s,all besub?ect to t,e appro7al o6 NEA = "'-

JTD(b)

No c,e5ical treat5ent processes s,all be used 6or t,e treat5ent o6 se8a4e to t,ereBuired standard-

(c) In speci6ic cases tertiar> treat5ent andor disin6ection processes to obtain a,i4,er 4rade e66luent Bualit> 5a> be reBuired b> t,e "' or NEA-

(d) T,e se8a4e treat5ent plant s,all be desi4ned in co5pliance 8it, t,ereBuire5ents ,erein and endorsed b> a uali6ied "erson-

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(e) T,e desi4n loadin4 criteria o6 eac, and e7er> co5ponent treat5ent process unitss,all be set out and supported 8it, desi4n calculations (6or structural processand ,>draulics en4ineerin4) and detailed ,>draulics and process line sc,e5aticdra8in4s endorsed b> a uali6ied "erson-

(6) T,e se8a4e treat5ent plant s,all be supported on a per5anent 6oundation-

(4) T,e se8a4e treat5ent plant s,all be desi4ned to t,e 6ollo8in4 desi4nreBuire5ents:

(i) >draulic con7e>in4 capacit> based on desi4n pea3 6actor o6 % ti5es t,edesi4n a7era4e dail> 6lo8-

(ii) T,e inco5in4 se8a4e s,all be li6ted up b> pu5pin4 and t,erea6ter carriedt,rou4, t,e treat5ent process units and 6inall> disc,ar4ed all b> 4ra7it>6lo8- No pu5pin4 o6 6inal e66luent is allo8ed-

(iii) T,ere s,all be an o7er6lo8 pipe located at an appropriate le7el in t,e inlet

c,a5ber or pu5p 8ell to allo8 se8a4e o7er6lo8 to t,e outlet drain in t,ee7ent o6 plant upsets or po8er 6ailure-

(i7) T,e plant its appurtenances and t,e e66luent outlet pipe s,all be set abo7et,e 5ini5u5 plat6or5 le7el stipulated b> t,e Draina4e Mana4e5entDi7ision %" Net8or3 Depart5ent ("')-

(7) T,e se8a4e treat5ent plant s,all ,a7e 6acilities to ensure t,at t,e treat5entprocesses operate e66ecti7el> t,rou4,out all diurnal 7ariations o6 se8a4e6lo8 into t,e plant-

(7i) lud4e retention in t,e pri5ar> settlin4 or ot,er si4ni6icant slud4eproducin4 process units s,all be not less t,an %0 da>s desi4n slud4eproduction rate- T,is s,all be co5plete 8it, slud4e dra8;o66 pipeline- No

slud4e dr>in4 beds are to be used-

(7ii) T,e plant s,all be sel6;operatin4 based on si5ple settin4s t,at are sel6;ad?ustin4 as 6ar as possible and 8,ic, reBuire periodic and in6reBuent5onitorin4 and resettin4-

(7iii) Airti4,t co7ers s,all be installed o7er t,e 8,ole plant to contain odour andpre7ent t,e breedin4 o6 insects- T,ese co7ers s,all be o6 se45ents o6li4,t8ei4,t 5aterial and be easil> re5o7ed and reinstalled 8it,out t,e needo6 ,ea7> li6tin4 eBuip5ent to 6acilitate plant 5aintenance 8or3-

(i) T,e plant 5aterial used s,all be 5ade o6 corrosion resistant t>pe or beadeBuatel> coated 8it, protecti7e 5aterial to 8it,stand and endure t,ese8era4e en7iron5ent-

() a5plin4 pipelines s,all be pro7ided at strate4ic locations o6 t,e indi7idualtreat5ent process units to 6acilitate representati7e sa5plin4 6or anal>sin4t,e per6or5ance o6 t,e treat5ent process units-

(i) A dosin4 c,a5ber s,all be pro7ided 6or t,e dosin4 o6 sodiu5 ,>poc,loriteto disin6ect t,e 6inal e66luent- It s,all be desi4ned 8it, 2 5inutes retentionti5e o6 t,e dail> pea3 6lo8 rate-

(ii) T,e plant desi4n s,all be pro7en 8it, a trac3 record o6 operation in t,epre7ious . >ears-

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(,) pon co55issionin4 t,e se8a4e treat5ent plant s,all be test;run andper6or5ance tested and certi6ied to be per6or5in4 in co5pliance 8it, t,e desi4ncriteria to ac,ie7e t,e standard 6or t,e 6inal e66luent Bualit>- Test anal>ses s,all

be carried out at an accredited laborator>- T,e uali6ied "erson s,all dul>endorse all tests and certi6ication-

(i) T,e reBuire5ents on Mec,anical and Electrical eBuip5ent are set out in ection2-$-

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2"& MEC?ANICA3 9 E3ECTRICA3 )M9E, RE:IREMENTSFOR SEWERAGE INSTA33ATIONS

2"&"1 Me'/ani'a( Re7ire!ents

2-$-1-1 "u5ps

(a) "u5p bodies and i5pellers s,all be o6 corrosion resistant 5aterial suitable 6or t,epu5ped 5edia (e-4- cast iron or stainless steel)-

(b) Re6lu and isolatin4 7al7es s,all be pro7ided 6or t,e pu5pin4 s>ste5-

(c) A 5ini5u5 o6 t8o pu5ps co5prisin4 t,e dut> and standb> pu5ps s,all bepro7ided 6or t,e se8era4e installation- ,ere t8o pu5ps are pro7ided one s,all bet,e dut> pu5p and t,e ot,er t,e standb> pu5p- T,e standb> pu5p s,all be

acti7ated in t,e e7ent t,e dut> pu5p 6ails or durin4 ,i4, le7el-

(d) T,e pu5ps s,all be capable o6 auto5atic startin4 and stoppin4- Controls s,all alsobe pro7ided 6or auto5atic interc,an4e o6 dut> and standb> pu5ps a6ter eac, c>cleo6 operation-

2-$-1-2 e8a4e "u5ps

(a) e8a4e pu5ps s,all be capable o6 passin4 lon4 6ibrous 5aterials-

(b) e8a4e pu5ps o6 up to 2-2 3 s,all be capable o6 passin4 solids o6 !$ 55 india5eter 8it,out c,o3a4e and s,all be 8it, disc,ar4e pipes o6 5ini5u5 . 55dia5eter-

(c) e8a4e pu5ps abo7e 2-2 3 s,all be capable o6 passin4 solids o6 . 55 india5eter 8it,out c,o3a4e and s,all be 8it, disc,ar4e pipes o6 5ini5u5 100 55dia5eter-

2-$-1-% e8a4e E?ector olids Di7ertor

(a) T,e pit 6or t,e se8a4e e?ector or solids di7ertor installation s,all be adeBuatel>

si@ed to acco55odate t,e tan3s pu5ps de8aterin4 su5p pu5p 7al7es pipe8or3etc- and s,all include 8or3in4 space 6or 5aintenance- *enerall> a roo5 s,all be

pro7ided and t,e pit s,all be o6 5ini5u5 %5 %5 si@e- T,is pro7ision enables t,e6ollo8in4 6unctional reBuire5ents to be 5et:

(i) A sa6e 8or3in4 en7iron5entF

(ii) AdeBuate securit> and protection 6ro5 7andalis5F and

(iii) &ree 6ro5 obstructions at all ti5es 6or 5aintenance purposes-

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o8e7er 6or cases 8,ere a roo5 is not pro7ided t,e 6unctional reBuire5ents s,allne7ert,eless be co5plied 8it, as 6ollo8s:

(1) AdeBuate 6orced 7entilation s>ste5 s,all continue to be pro7ided 6or t,e sa6e8or3in4 en7iron5ent o6 8or3ers operatin4 and 8or3in4 in t,e se8era4e

installationF

(2) T,e pit s,all be located a8a> 6ro5 dri7e8a>F

(%) Measures s,all be pro7ided all round t,e pit to pre7ent 8ater 6lo8in4 into itand to pre7ent 7e,icles or ot,er ite5s 6ro5 obstructin4 access and5aintenance-

($) T,e pit s,all be securel> co7ered 8it, loc3able doors or co7ersF

(.) T,e access openin4 6or t,e pit s,all etend o7er t,e 8,ole o6 t,e e?ectordi7ertor tan3 and pu5psF

(!) i6tin4 eBuip5ent s,all be pro7ided 6or t,e installation-

(b) ,ere pu5pin4 eBuip5ent are needed to ,andle 8aste disc,ar4e 6ro5 restaurants6ood centres and 5ar3ets located at base5ents solids di7ertors s,all be pro7ided-o8e7er 6or cases 8,ere 4rease traps are pro7ided upstrea5 o6 t,e se8a4e

pu5pin4 installation se8a4e e?ectors 5a> be pro7ided in lieu o6 solids di7ertors-

(c) e8a4e e?ector solids di7ertor tan3 s,all be 5ade o6 corrosion resistant 5aterialsuitable 6or t,e pu5ped 5edia (e4- stainless steel)- T,e tan3 s,all be 5ounted on aconcrete plint,-

(d) Access openin4 s,all be pro7ided directl> abo7e t,e se8a4e e?ector solids di7ertortan3 and pu5ps 6or ease o6 5aintenance-

(e) &or solids di7ertor a 5ini5u5 clearance o6 1-# 5 bet8een le7els o6 t,e pipe in7ertand t,e solids di7ertor 6loor is reBuired to ensure t,at t,e inco5in4 pipe in7ert isal8a>s ,i4,er t,an t,e outlet b>pass pipe o6 t,e solids di7ertor-

(6) Air release pipes 8it, isolatin4 7al7es and air release 7al7es s,all be pro7ided 6ort,e separatin4 c,a5ber and t,e t8o;8a> 7al7es o6 t,e di7ertor tan3-

(4) De8aterin4 sub5ersible su5p pu5p in t,e se8a4e e?ector solids di7ertor pit s,allbe pro7ided and s,all pu5p into t,e e?ector di7ertor disc,ar4e pipe-

(,) De8aterin4 su5p pu5p s,all be pro7ided 8it, re6lu and isolatin4 7al7es-

(i) Access ladders and ,and,olds o6 suitable 5aterial (e-4- alu5iniu5 allo> or 4lassrein6orced plastic) s,all be pro7ided 6or t,e e?ector di7ertor pit-

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(?) AdeBuate li4,tin4 and a 8ater tap s,all be pro7ided 6or t,e e?ector di7ertorinstallation-

(3) "er6orated strainer plate and cone ba66le o6 t,e solids di7ertor s,all be 5ade o6stainless steel- trainer plate s,all be o6 t,e re5o7able t>pe-

(l) /ent pipe o6 not less t,an .55 s,all be pro7ided 6or t,e e?ector di7ertor tan3- It

s,all be connected to t,e 5ain 7ent stac3-

2-$-1-$ "u5p u5p

(a) A screen c,a5ber s,all be pro7ided be6ore t,e pu5p su5p (ecept 6or car par3pu5p su5p)- T,e screen s,all be 5ade o6 alu5iniu5 allo> or stainless steel-

(b) Access openin4 s,all be pro7ided directl> abo7e t,e pu5ps 6or ease o6

5aintenance-

(c) adders installed 8it,in pu5p su5p and screen c,a5ber s,all be o6 suitable5aterial (e-4- stainless steel or *R")-

(d) An o7er6lo8 pipe to t,e do8nstrea5 se8er s,all be pro7ided 8,ere possible-

(e) i6tin4 eBuip5ent o6 sa6e 8or3in4 load s,all be pro7ided-

(6) AdeBuate 7entilation s>ste5 s,all be pro7ided 6or t,e installation-

(4) AdeBuate li4,tin4 and a 8ater tap s,all be pro7ided-

(,) ,en t,e dept, o6 pu5p su5p or screen c,a5ber eceeds ! 5 inter5ediateplat6or5s s,all be pro7ided- Alu5iniu5 allo> (or superior 5aterial) ,andrail andsa6et> c,ain s,all be pro7ided at t,e inter5ediate plat6or5-

2-$-1-. e8a4e Treat5ent "lant (T")

(a) ,ere pu5ps are reBuired t,e T" s,all be desi4ned so t,at t,e pu5p is used toli6t crude se8a4e or settled se8a4e-

(b) T,e T" s,all co5pl> 8it, t,e 6ollo8in4:

(i) T,e reBuire5ents 6or pu5p su5p as detailed in Clause 2-$-1-$-

(ii) A s8itc,roo5 to ,ouse t,e s8itc,board s,all be pro7ided 8it, adeBuateli4,tin4 and one po8er point-

(iii) A ,i4, se8a4e le7el indicatin4 s>ste5 co5prisin4 a 6loat acti7atedre7ol7in4 6las,in4 li4,t and re6lecti7e si4n plate 8it, ,otline nu5ber s,all

be pro7ided and installed in a pro5inent location-

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(c) &or dosin4 sip,on cleanin4 e>e s,all be incorporated in t,e disc,ar4e pipe bend-

(d) Mercur> seals s,all not be used-

2-$-1-! creenin4

creens o6 suitable corrosion resistant 5aterial (e-4- stainless steel) s,all be pro7ided topre7ent lar4e ob?ects 6ro5 enterin4 t,e installation so as not to cause da5a4e to t,epu5pin4 eBuip5ent and disruption to t,e pu5pin4 s>ste5-

2-$-1- i6tin4 EBuip5ent

(a) i6tin4 eBuip5ent o6 adeBuate sa6e 8or3in4 load s,all be pro7ided 6or t,e5aintenance and replace5ent o6 eBuip5ent in t,e se8era4e installation- T,e li6tin4eBuip5ent s,all be able to tra7erse t,e installation and be able to reac, t,eeBuip5ent reBuired 6or li6tin4 8it, ease- T,e li6tin4 eBuip5ent s,all be inspected b>an appro7ed person and s,all be re4istered 8it, t,e &actor> Inspectorate Ministr>o6 Manpo8er-

(b) *enerall> t8o c,ain bloc3s s,all be pro7ided- T,e c,ains s,all be o6 adeBuatelen4t, o6 not less t,an .5 and s,all be capable o6 li6tin4 sa6el> t,e ,ea7iesteBuip5ent or plant-

2"&"2 E(e'tri'a( Re7ire!ents

(a) T,e electrical installations s,all co5pl> 8it, t,e latest in4apore tandard ()C" . C" 1! and ot,er rele7ant C"s-

(b) An electric s8itc,roo5 s,all be pro7ided 8it, t,e s8itc,board5otor control centreo6 enclosure ratin4 eceedin4 or eBual to I"$1- ,ere appro7ed an open s,elter8it, a 8eat,erproo6 s8itc,board 5a> be allo8ed- T,e s8itc,board s,all be

pro7ided 8it, an outer enclosure to not less t,an I".$ ratin4 and 5ade o6 non;corrodin4 5aterial suc, as stainless steel or alu5iniu5 allo> 5aterial-

(c) T,e electrical pro7isions s,all include t,e 6ollo8in4 ite5s:

(i) Main isolatin4 6used s8itc, or circuit brea3er-

(ii) eparate 6used s8itc, or circuit brea3er 6or eac, pu5p-

(iii) Auto5atic 5otor starters 8it, 5otor o7erload protection incorporatin4sin4le;p,ase protection and auto5atic control o6 pu5p 5otors- Eac, 5otorstarter s,all be pro7ided 8it, indicatin4 li4,ts start;stop and ,and reset pus,

button and 5anualauto5atic selector s8itc,es-

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(i7) Auto5atic startin4 and stoppin4 o6 pu5ps usin4 le7el sensin4 6loat s8itc,esor electrodes- T,e standb> pu5ps s,all also operate 8,en t,e le7el is ,i4,and 8it, re4ular auto5atic interc,an4e o6 dut> and standb> pu5ps- Todisallo8 L,untin4 o6 t,e pu5ps a separate 6loat s8itc, or electrode s,all be

pro7ided 6or eac, le7el- An eart,;return electrode s,all be pro7ided 6or t,eelectrode control s>ste5- T,e 6loat s8itc,es s,all be s,ac3led to a stainless

steel c,ain-

(d) A standb> 4enerator or an alternate po8er source 8it, auto5atic electricit>c,an4eo7er s,all be pro7ided-

(e) T,e le7el control s>ste5 s,all be operated 8it, 7olta4e not eceedin4 2$;7olt ACs>ste5-

(6) AdeBuate li4,tin4 s,all be pro7ided 6or t,e se8era4e installation- &luorescent la5p(s)8it, corrosion resistant 6ittin4s s,all be pro7ided-

2-$-% T,e o8nerde7eloperoccupier o6 t,e se8era4e installation to be ta3en o7er b> "' s,allpa> t,e cost o6 all repairs to t,e installation 6encin4 etc- 6or a period o6 one >ear 6ro5 t,edate o6 ta3in4o7er-

2-$-$ &or installations to be ta3en o7er b> "' t,e 6ollo8in4 s,all also be pro7ided andco5plied 8it,:

(i) Ele7ated brea3 8ater tan3 5ade o6 appro7ed 6ibre4lass or stainless steel-

(ii) eparate electricit> and 8ater 5eters 8,ic, s,all be located 8it,in t,e co5poundo6 t,e installation-

(iii) 2-$ 5 ,i4, "/C;coated c,ain lin3 6encin4 and $-0 5 8ide separate 7e,icularaccess road 8it, 4ate co5pl>in4 8it, t,e Depart5entHs tandard Dra8in4s-

(i7) Disinte4rators or c,annel screen disinte4rators-

(7) Inlet c,annel and di7idin4 8all risin4 spindle penstoc3s-

(7i) &ied suppl> and e,aust 7entilation s>ste5s 6or t,e 8et 8ell and suppl>7entilation s>ste5 6or t,e dr> 8ell-

(7ii) andrailin4 ladders sa6et> ca4es and ,and ,olds-

(7iii) tandb> 4enerator 8it, auto5atic trans6er s>ste5 and dail> 6uel tan3-

(i) tandb> 4enerator buildin4 or a containerised standb> 4enerator-

() nder4round bul3 6uel tan3-

(i) Odour and acoustic control 6acilities-

(ii) Toilet 6acilities-

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(iii) $00/ electrical Motor Control Centre MCC-

(i7) pares 6or t,e eBuip5ent (In t,e case o6 se8a4e treat5ent plants spares s,all besu66icient 6or 2 >ears o6 operation-)

(7) Operation = Maintenance 5anuals (process and eBuip5ent etc-)-

(7i) Ot,er eBuip5ent and reBuire5ents as i5posed b> t,e Depart5ent 8,ic, can beobtained 6ro5 t,e Internet ebsite at R Address:,ttp:888-pub-4o7-s4-

2-$-. &or all installations to be ta3en o7er b> "' a Re5ote Tele5etr> nit (RT) s,all beinstalled- T,e reBuire5ents 6or t,e RT s>ste5 are a7ailable in t,e Internet ebsite at

R Address : /tt455***"#".o%"s.
http://www.pub.gov.sg/http://www.pub.gov.sg/http://www.pub.gov.sg/http://www.pub.gov.sg/http://www.pub.gov.sg/http://www.pub.gov.sg/

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PART ste5 ser7in4 t,e 6ollo8in4 areas s,all be connected to sur6acestor5;8ater drains-

(i) Co55on corridorsco55on7eranda,s

(ii) Co7ered areas (7oid dec3ecept 8as, area)

(iii) Co7ered pla> areas(iv) Multi;store> car par3s (eceptcar 8as,in4 areas)

(v) Open areas in bac3>ardscourt>ardsair8ells and ot,er unco7ered pa7ed

areas 8it,in pre5ises 8,ere rain8ater 6lo8s are epected(vi) "u5p islands at petrol stations(vii) &ootbat,s open s,o8er pointsin public and pri7ate s8i55in4 pools

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sanitar> drain;line s,all be laid outside buildin4s 8,ere7er practicable-(b) ,ere a drain;line passes under a buildin4 it s,all be o6 ,ea7> dut> 5aterial (e-4-

Ductile iron pipes) and laid in a strai4,t run 6or t,e 8,ole distance and s,all beencased in concrete o6 adeBuate t,ic3ness(%;.)-

(c) I6 t,e drain;line ,as to pass t,rou4, a base5ent 8all or la> 8it,in base5ent slab its,all be o6 ,ea7>;dut> 5aterial (e-4- ductile iron pipes)- "ro7ision in t,e desi4ns,all be 5ade to ta3e care o6 di66erential settle5ent to reduce t,e ris3 o6 s,ear6racture to ensure 8ater ti4,tness and reliable ser7ice-

to carr> t,e loadin4- On so6t or >ieldin4 4round pilin4 ,as to bedesi4ned- T,e

beddin4 details are s,o8n in Dra8in4 No %;.-

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(b) T,e 6irst inspection c,a5ber s,all be 7entilated ecept 8,en t,ere is adisc,ar4e7entilatin4 stac3 o6 not less t,an 10055 dia5eter or 8,ere pro7ision o6t,e 7entilation stac3 8ould cause odour nuisance to t,e surroundin4s-

(c) Details o6 construction o6 inspection c,a5ber are s,o8n in Dra8in4 No %;-,ere t,e inspection c,a5ber eceeds 2-. 5etres deep it ,as to be speciall>

desi4ned- ea7>;dut> cast iron 6ra5e and co7er s,all be used in e7er> dri7e;8a>and car par3-

(d) At t,e inspection c,a5ber branc, drain;line s,all be connected to t,e 5ain drain;line at a le7el abo7e t,e in7ert le7el and not less t,an ,al6 t,e dia5eter o6 t,e 5aindrain;line to ensure s5oot, 6lo8-

(e) Measures s,all be ta3en to protect t,e inspection c,a5ber sited 8it,in 2-. 5 o6 t,etop or botto5 o6 an e5ban35ent 8,ere its slope is steeper t,an 1:1-. (e-4-retainin4 8all)-

(6) T,e last inspection c,a5ber s,all be located 8it,in 2-. 5etres o6 t,e lot boundar>-

(4) &or 6ood s,op no inspection c,a5ber s,all be sited 8it,in t,e areas 8,ere 6ood isprepared coo3ed stored or ser7edF or ot,er areas 8,ere t,e> are li3el> to 4i7e riseto nuisance ,ealt, or ,>4iene ,a@ards durin4 5aintenance-

3erbed anddesi4ned so t,at no rain8ater can enter t,e se8er- It s,all be pro7ided 8it, eit,er a6loor 8aste connectin4 to 6loor trap or a 6loor trap connectin4 directl> to an inspectionc,a5ber- T,e details are s,o8n in Dra8in4 No %;#-

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eposed to rain ort,e car;par3in4 areas are li3el> to sub?ect to sur6ace 8aterruno66s 6ro5 rain t,e draina4e s>ste5 ser7in4 t,e car

par3in4 areas (ecept car 8as,in4 areas) s,all be connectedto sur6ace stor5;8ater drain 7ia an oil interceptor i6

necessar>- In suc, case no 6loor 8astes are reBuired- T,e8ater disc,ar4in4 into open drain s,all 5eet t,e disc,ar4estandards as speci6ied b> NEA-

Conne'tion %ia Petro( and Oi( Inter'etor)Standard Dra*in. No" P5WRN5STD50&2,

(i) ubrication ba> and car 8as,in4 ba> o6 petrol station

() Motor 4ara4e

(b) aste su5ps 5a> be pro7ided at 5ultiple ?unctions o6 t,e 8aste disc,ar4e

pipes to 6acilitate ease o6 5aintenance- Details o6 8aste su5p are s,o8n inDra8in4 No %;10a-

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desi4ned 6loor su5p(%;1%)s,all be pro7ided to collect t,e sulla4e 8ater 6ro5t,e scupper drains 8it,in t,e stalls and at t,e ser7ice corridors and t,e co55on

passa4e8a>s- T,e details are s,o8n in Dra8in4 No- %; 12a-

(b) aste su5p (%;10a)s,all be sited at ser7ice corridors and a8a> 6ro5 t,e 5ain publicareas- Inspection c,a5ber s,all be sited outside t,e 5ar3et proper-

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;dut> cast iron -

' $!22 : 190

(i7) /itri6ied Cla> - ' EN 29. : 1991

(7) Rein6orced concrete - 1#% : 19#

(b) Man,oleInspection c,a5ber6ra5es and co7ers

- %0 : 1999

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plu5bin4 s>ste5 s,all be desi4ned to eclude 6oul air 6ro5 t,e disc,ar4epipes or stac3s 6ro5 enterin4 t,e buildin4s- In t,is connection 8ater seals o6su66icient dept, (not less t,an .0 55) are reBuired to be pro7ided at sanitar>appliances and 6loor traps- T,e s>ste5 s,all be desi4ned and installed to a7oid 8aterseal loss in trap arisin4 6ro5 pressure 6luctuations t,rou4, t,e pro7ision o67entilatin4 pipesstac3s or adeBuate si@in4 o6 disc,ar4e stac3s as appropriate 6or t,esanitar> plu5bin4 s>ste5-

(d) In t,e case o6 residential buildin4s 8,ere t,e sanitar> appliances are closel> 4rouped

around a disc,ar4e stac3 t,e Psin4le stac3 s>ste5P 5a> be adopted 6or buildin4s upto si store>s ,i4, and t,e P7entilated stac3 s>ste5P 6or buildin4s up to t,irt> store>s,i4,-

(e) In t,e desi4n and installation o6 t,e sanitar> plu5bin4 s>ste5 attention s,all be 4i7en

to t,e need to 6acilitate access 6or 5aintenance and repairs- Access co7er andorcleanin4 e>es s,all be appropriatel> positioned to enable cleanin4 clearin4 o6c,o3a4es and inspection to be carried out-

(6) T,e disc,ar4e pipe s,all not be located in places 8,ere it can cause ,ealt, and sa6et>

,a@ards suc, as locatin4 t,e disc,ar4e pipe abo7e an> potable 8ater stora4e tan3and electrical trans6or5er s8itc,4ear-

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(4) T,e disc,ar4e pipe s,all also not be located in places 8,ere it can 4i7e rise tonuisance conditions durin4 5aintenance- In particular 6or buildin4s under t,e andTitles (trata) Act disc,ar4e pipes s,all not run abo7e bedroo5s li7in4 roo5dinin4 roo5 or 3itc,en areas o6 t,e strata unit belo8- ,ere suc, routin4 cannot bea7oided suitabl> desi4ned ser7ice duct to allo8 access 6or 5aintenance s,all be

pro7ided-

(,) As reBuired b> NEA adeBuate 5easures suc, as installation o6 anti; 5osBuito

de7ices at t,e 6loor trap s,all be ta3en to pre7ent 5osBuitoes 6ro5 breedin4 in t,e8ater seal o6 t,e 6loor trap-

(i) &or se8a4e collected belo8 4round le7el se8a4e e?ector solids di7ertor or ot,erappropriate pu5pin4 installation 8ill ,a7e to be pro7ided-

(?) T,e sanitar> plu5bin4 s>ste5 s,all be tested 6or 8ater and air ti4,tness eit,er b>5eans o6 an air test s5o3e test or 8ater test 6or soundness o6 t,e installation-Re6erence can be 5ade to ' ..2 6or details-

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pes o6sanitar> plu5bin4 s>ste5s:

(a) T,e disc,ar4e pipe s,all ,a7e a 5ini5u5 si@e o6 10055 and be 5ade o6 t,e sa5e5aterial t,rou4,out its entire len4t,- T,e pipe s,all not be reduced in dia5eter in t,edirection o6 6lo8-

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(b) In t,e case o6 t,e P6ull> 7entilated s>ste5P and P7entilated stac3 s>ste5P t,edisc,ar4e stac3 s,all as 6ar as practicable not 6or5 an> o66set t,rou4,out its entirelen4t,- ,ere o66set is to be 5ade lar4e radius bends o6 at least 20055 radius s,all

be used and cross 7entin4 bet8een t,e 7entilatin4 stac3 and t,e disc,ar4e stac3 isreBuired abo7e and belo8 t,e o66set (%;21)-

(c) 8ept branc, connections 6ro5 disc,ar4e pipe to disc,ar4e stac3 are reco55ended-Directl> opposite disc,ar4e pipes 8it,out s8ept entries s,all be at least 200557erticall> apart so t,at disc,ar4e 6ro5 one branc, into t,e ot,er is a7oided-

(d) T,e disc,ar4e pipe and disc,ar4e stac3 s,all be securel> supported or 6ied to t,e8all or roo6 slab o6 t,e buildin4-

(e) T,e disc,ar4e pipe and disc,ar4e stac3 s,all be easil> accessible- Access co7ers 6orcleanin4 e>es s,all be positioned to allo8 cleanin4 and 5aintenance eBuip5ent to beeasil> inserted into t,e pipe8or3 and to per5it cleanin4 or clearin4 o6 all parts o6 t,es>ste5- Access co7er on t,e in7ert o6 pipe s,all be a7oided- Access 6or roddin4 andtestin4 s,all be pro7ided at or near t,e 6oot o6 t,e disc,ar4e stac3 and at ?unctions o6

disc,ar4e pipestac3-

(6) T,e 7entilatin4 pipe s,all be 6ied as close to t,e cro8n o6 t,e trap as practicable-Ot,er aspect o6 t,e construction o6 7entilatin4 stac3 cross 7entin4 ter5ination o6disc,ar4e stac3 and 7entilatin4 stac3 are s,o8n in Dra8in4 No- %; 1.a %;1!a %;1b %;1#b = %;21-

(4) T,e 7entilation stac3 s,all not be ter5inated in an> pri7ate pre5ises or pri7ateroo6 area t,at is desi4ned 6or use b> t,e occupants- To a7oid ter5ination o67entilation stac3 in pri7ate pre5ises or roo6 areas t,e 7entilatin4 stac3 5a> beo66set or connected to a co55on pipe o6 adeBuate si@e and etended 6orter5ination in t,e open air at t,e ,i4,est point o6 t,e buildin4 or ot,er suitablelocation t,at 8ill not cause s5ell nuisance or ,ealt, ,a@ard to t,e occupants- T,ereco55ended ,ei4,t o6 t,e 7entilatin4 stac3 abo7e roo6 is s,o8n in Dra8in4 Nos-%;1.a %;1!a %;1b = %;1#b- (Addendum No.1-Feb 2001)

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appliances s,all be secured in position and installed in a 5anner t,at6acilitate disconnection to t,e sanitar> pipin4 8,en reBuired- T,e supports and

brac3ets used 6or 6iin4 o6 t,e sanitar> appliances to 8all s,all be o6 adeBuatestren4t, to 8it,stand t,e 6ull> loaded 8ei4,t o6 t,e appliance- In no circu5stancess,ould an> pipe8or3 be relied upon 6or support or 6iin4 t,e appliance-

(c) Connection o6 oil anitar> Appliance

(i) oil anitar> Appliance is 6or t,e reception and disc,ar4e o6 ecretor> 5atter-Ea5ples o6 soil sanitar> appliances are 8ater closet pan urinal and bidet etc-

(ii) Direct connection 6ro5 an> 8ater ser7ice pipe s,all not be 5ade to an> part o6 a

soil sanitar> appliance ot,er t,an a connection t,rou4, t,e 6lus,in4 cistern or6lus, 7al7e as detailed under Clauses %-%-%-2 and %-%-%-$ o6 t,is ectionrespecti7el>- T,is is to pre7ent conta5ination o6 t,e potable 8ater s>ste5-

(iii) T,e soil sanitar> appliance s,all ,a7e at least one trap 8it, a 8ater seal o6 notless t,an .0 55 be6ore connectin4 directl> to a separate branc, drain;line to aninspection c,a5ber on 6irst store> le7el or to a disc,ar4e pipe on upper store>le7el-

(d) Connection o6 aste anitar> Appliance

(i) A 8aste sanitar> appliance is 6or t,e reception and disc,ar4e o6 8ater 6orablutionar> cleanin4 or culinar> purpose- Ea5ples o6 8aste sanitar> appliancesare sin3 basin bat, and s,o8er tra> etc-

(ii) T,e 8aste sanitar> appliance 5a> be pro7ided 8it, a 8aste 6ittin4 trap 6or

connection to t,e 8aste pipe-

(iii) aste pipes ser7in4 8aste sanitar> appliances are to be adeBuatel> si@ed to

,andle t,e anticipated 6lo8- T,e 8aste pipe s,all connect abo7e t,e 8ater seal o6t,e 6loor trap-

(i7) T,e 8aste sanitar> appliance 8,ic, is suspended s,all be 6ied to t,e 8all b>5eans o6 brac3ets 8,ic, are built or scre8ed into t,e 8all- All installation scre8ss,all be corrosion resistant-

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(7) oop 7entin4 (%;2$) is reBuired 8,ere a 4roup o6 % or 5ore 8as, basins are

connected in series- o8e7er t,e loop 7entin4 s,all be ter5inated separatel> tot,e at5osp,ere- T,e 5ini5u5 dia5eter o6 loop 7entin4 pipe s,all be 2. 55-Alternati7el> Air Ad5ittance /al7e 5a> be used-

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) Re4ulations a 6lus,in4 6lus,in4 6ora 8ater closet s,all deli7er not 5ore t,an $-. litres o6 8ater per 6lus,-

(b) T,e 6lus,in4 cistern ecept 8,en it is o6 a sel6 supportin4 close;coupled 8ater closetsuite s,all be installed abuttin4 and 6ir5l> 6ied to t,e 8all b> eit,er stainless steel

bolts and nuts stainless steel brac3ets (or support pads) or ot,er appro7ed 5eans-

(c) T,e connection o6 t,e 6lus, pipe o6 t,e 6lus,in4 cistern to t,e 8ater closet pan andt,e urinal s,all be 5ade usin4 a purpose 5ade connector or bus, to ensure a robustand 8aterti4,t ?oint-

(d) T,e ,i4, le7el 6lus,in4 cistern s,all be 6ied to an oriental 8ater closet pan 8it, a6lus, pipe o6 ,ei4,t not less t,an 1-. 5etres bet8een t,e botto5 o6 t,e cistern andt,e top o6 t,e 8ater closet pan- T,e 6lus, pipe s,all not be less t,an %2 55 india5eter-

(e) &or lo8 le7el 6lus,in4 cistern t,e 5ini5u5 internal dia5eter o6 t,e 6lus, pipe s,all

be %. 55-

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) Re4ulations (1) a 6lus, 7al7e 6or a8ater closet s,all deli7er not 5ore t,an $-. litres o6 8ater per 6lus, and a

6lus, 7al7e 6or urinal s,all deli7er not less t,an 1-. litres and not 5ore t,an2-. litres o6 8ater 6or indi7idual urinal unitF (2) &lus, 7al7e s,all not beused in residential pre5ises-

(b) Onl> 8ater closets and urinals in non;do5estic buildin4spre5ises 5a> be 6itted8it, 6lus, 7al7es-

(c) T,e 6lus, 7al7e s,all be pre6erabl> acti7ated b> depressin4 a pus,;3nob- Allad?ustin4 5ec,anis5s s,all be te5per proo6 and securel> concealed- &lus, 7al7e8it, onl> t,e acti7atin4 3nob eposed to t,e user is pre6erred-

(d) T,e 6lus, pipe s,all be 5ade o6 eit,er stainless steel or c,ro5e;plated copper allo>

and pre6erabl> concealed-

(e) T,e connection o6 t,e 6lus, pipe o6 t,e 6lus, 7al7e to t,e 8ater closet pan and urinals,all be 5ade usin4 a purpose 5ade connector to ensure a robust and 8aterti4,t

?oint-

6ro5 t,e 8atersuppl> unless t,rou4, an appro7ed 7acuu5 brea3er and c,ec3 7al7e or ot,erappro7ed 5eans 6or pre7entin4 bac36lo8 or bac3;sip,ona4e and controlled b>appro7ed stop;7al7e-

(c) T,e bidet s,all be pro7ided 8it, a 6ittin4 trap o6 at least $0 55 in dia5eter- T,e

connection b> 5eans o6 a bidet trap o6 at least . 55 in dia5eter s,all be 5ade toan inspection c,a5ber on 6irst store> le7el or to a disc,ar4e pipe on upper store>le7el (%;2.)-

(d) T,e bidet s,all be installed in accordance 8it, t,e pedestal 8ater closet pan or t,e8all ,un4 8ater closet pan as speci6ied in Clause %-%-%-1(c) or %-%-%-1(d)-

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Appro7al o6 "' s,ould be obtained 6or t,e use o6 an> special sanitar> appliance notco7ered under t,is ection- T,is includes t,e special soil sanitar> appliances 6or,ospital-

4radeddesi4ned so as to enable Buic3draina4e o6 t,e 8aste8ater 6ro5 tap points or s,o8er points to t,e 6loor traps toa7oid 8ettin4 o6 t,e 8,ole toilet 6loor area-

(4) &or 4roup s,o8ers a 6loor trap s,all be pro7ided to ser7e a 5ai5u5 o6 . s,o8ers-A 6loor 8aste or c,annel o6 adeBuate capacit> s,all be pro7ided in t,e s,o8erco5part5ents to con7e> t,e sulla4e 8ater to t,e 6loor trap-

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(b) T,e 4ratin4 and co7er s,all be o6 an appro7ed desi4n so as to enable t,e5 to besecured to deter t,e un8arranted openin4 o6 t,e 4ratin4 or co7er and ,enceintroduction o6 4arba4e or ot,er solid 8aste into t,e se8era4e s>ste5-

o6 appro7ed

products is obtainable 6ro5 "' at 1 cience "ar3 Dri7e or can be do8nloaded 6ro5"' ebsite at R Address:,ttp:888-psbtest-co5

(c) Appro7al o6 t,e Depart5ent s,all be obtained 6or t,e use o6 ot,er t>pesdesi4ns o6sanitar> 8ares pipes and 6ittin4s 5an,ole inspection c,a5ber 6ra5es and co7ers notspeci6ied in t,is Code- T,ese sanitar> 8ares pipes and 6ittin4s 5an,ole inspectionc,a5ber 6ra5es and co7ers 5ust co5pl> 8it, t,e in4apore tandards or ot,er

acceptable tandards i6 no in4apore tandard is a7ailable-

(d) All sanitar> 8ares pipes and 6ittin4s 5an,ole inspection c,a5ber 6ra5es and co7erss,all be le4ibl> 5ar3ed 8it, t,e 5anu6acturerHs na5ebrand na5e or 5ar3 and t,estandards under 8,ic, t,e product con6or5 to- T,e 5ar3in4s 5a> be cast;on coldsta5ped or painted on t,e product- Alternati7el> labels 5a> be a66ied or attac,ed tot,e product

Draina4e >ste5 $2

Dra*in. No"

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Dra*in. No" details $.

Dra*in. No"pe 'eddin4 6or Drain;ine $!

Dra*in. No"ste5 6or Mar3et .%

Dra*in. No"ste5 8it, /entilatin4 Arran4e5ent 6or i;tore> oro8er Multi;tore> 'uildin4s

.!

Dra*in. No" /entilated >ste5 8it, /entilatin4 Arran4e5ent 6or e7en;tore> ori4,er Multi;tore> 'uildin4s

.

Dra*in. No"ste5 6or 'uildin4s p to i tore>s .#

Dra*in. No"ste5 6or 'uildin4s p to T,irt>; tore>s .9

Dra*in. No"pe) and ater Closet "anConnected in eries

!0

Dra*in. No"

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Code of Practice on Sewerage and Sanitary Works (1 stEdition Mar 2000)

PART &3IST OF STANDARD DRAWINGS A;AI3A3E FOR DOWN3OADFROM INTERNET WESITE AT R3 ADDRESS 4 ,ttp:888-pub-4o7-s4

Seria( No"Dra*in. N!#er Des'rition

1 "'RNTD001 tandard Details o6 Main e8ers and Man,oles

2 "'RNTD002 tandard Details o6 Minor e8ers and Man,oles

% "'RNTD00% "recast Concrete Man,ole "arts

$ "'RNTD00$ tandard $. De4rees 'end Man,ole 6or 10.055 Dia- =Abo7e

. "'RNTD00. tandard Man,ole 6or e8er 10.055 Dia- and Abo7e

! "'RNTD00! tandard Details o6 Deep "recast Concrete Man,ole 8it,one Inter5ediate "lat6or5

"'RNTD00 tandard Details o6 e8er Connections

# "'RNTD01. tandard ea7> Dut> Man,ole &a5e = Co7er

9 "'RNTD01! tandard Mediu5 Dut> Man,ole &ra5e = Co7er

10 "'RNTD01 tandard i4,t Dut> Inspection C,a5ber &ra5e =Co7er

11 "'RNTD01# Recessed T>pe i4,t Dut> Inspection C,a5ber &ra5e =Co7er

12 "'RNTD0$0 tandard Circular *rease Trap 6or Canteens Restaurants= Eatin4 talls

1% "'RNTD0$1 tandard *rease Trap 6or 5all Eatin4 talls1$ "'RNTD0$2 tandard *rease "etrol = Oil Interceptor; T,ree

Co5part5ents

1. "'RNTD0$% Cast Iron *ull> Trap 6or Motor or3s,op

1! "'RNTD0$$ Cast Iron *ull> Trap 6or 'in CentreRe6use Centre

1 "'RNTD0$. Cast Iron *ull> Trap 6or Mar3ets

1# "'RNTD0$! tandard Alu5iniu5 Allo> trainer 'uc3et = C- I- *ull>Trap

19 "'RNTD10% tandard # Metres = $-# Metres ide *ates

20 "'RNTD10$ tandard $ Metres ide *ate 6or e8a4e Treat5ent"lant

21 "'RNTD10. tandard 2-$ Metres i4, C,ain in3 &ence

22 "'RNTD111 ecurit> *rilles 6or "u5pin4 tation

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(Addendum No.1-Feb 2001)

PART =

3IST OF ANNE>ES

ANNE> A - GOOD SEWER AND PMPING MAINS 3AYINGPRACTICE

="1 Conne'tion to Eistin. Man/o(es

(a) E7er> care s,all be ta3en to ensure t,at t,e connections o6 pipelines to eistin4 5an,olesare 8aterti4,t and t,e eistin4 se8ers and 5an,oles are not da5a4ed-

(b) In connectin4 t,e pipeline to t,e eistin4 5an,ole a circular ,ole lar4e enou4, toacco55odate t,e pipeline s,all be 5ade in t,e 8all and t,e cut end o6 t,e pipe neatl>rendered to 6or5 a s5oot, bore-

(c) E7er> care s,all be ta3en to ensure t,at t,ere is no interruption to eistin4 6lo8s durin4connection 8or3s- No debris s,all be allo8ed to 6all or be disc,ar4ed into t,e eistin4se8ers-

="2 A#andoned Se*ers8 P!in. Mains8 Man/o(es and C/a!#ers

(a) Ends o6 t,e abandoned se8erspu5pin4 5ains s,all be sealed 8aterti4,t 8it,22.55 t,ic3 bric3 plu4s and rendered 8it, ce5ent 5ortar- T,e abandonedse8erspu5pin4 5ains o6 %0055 dia5eter and abo7e on public roads s,all be 6illed8it, concrete or ce5ent 4rout-

(b) All abandoned 5an,olesc,a5bers are to be de5olis,ed and 5an,ole 6ra5esand co7ers re5o7ed-

="< Conne'tion to Eistin. Pies

A co5patible 6it bet8een ne8 and eistin4 pipes s,all be ensured 8,ene7er connections areto be 5ade to eistin4 pipes- ,ere suc, a 6it is not possible speciall> 5anu6actured piece6or t,e transition 8ill ,a7e to be used-

="& Pie a'+in.

(a) "rior to pipe ?ac3in4 a co5pre,ensi7e soil in7esti4ation alon4 t,e route o6 t,e

pipeline s,all be carried out- table soil conditions at t,e ?ac3in4 6ace s,all be5aintained at all ti5es to pre7ent loss o6 4round abo7e t,e ?ac3in4 operation and5o7e5ent o6 t,e surroundin4 eart,- Maintenance o6 6ace stabilit> and pre7ention o64round 5o7e5ent and subsidence s,all be b> 5et,ods 8,ere 6luid slurr> or eart,

pressure is applied to t,e tunnel 6ace- nstable 4round a,ead o6 t,e ?ac3in4 6ace 5a>be stabilised b> t,e in?ection o6 suitable c,e5icals- Met,ods used s,all not lead tosi4ni6icant 4round loss-

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(b) Met,ods 8,ic, reBuire 8or35en to carr> out eca7ation eit,er 5anuall> orse5i;5ec,anicall> in pipes or tunnels s5aller t,an 120055 in dia5eter s,all not beused-

(c) Measures s,all also be ta3en to ensure t,at t,ere are no 7oids outside t,epipes-

="= Di%ersion o Eistin. Se*ers

(a) ,ene7er 5an,oles are to be constructed onto eistin4 se8er precautionar>5easures are to be ta3en to ensure t,at t,ere is no interruption to t,e 6lo8 in t,eeistin4 se8er- Care s,all also be ta3en to pre7ent an> debris 6ro5 6allin4 into t,ese8er and bein4 carried do8nstrea5- An> debris 6allin4 into t,e se8er 5ust bere5o7ed i55ediatel>- No eistin4 se8er s,all be sealed o66 until t,e ne8 line ,as beenco5pletel> inspected and certi6ied 6it 6or use- &or suc, cases t,e ends o6 t,e ne8l>constructed se8er s,all be plu44ed up until di7ersion o6 6lo8 can be i5ple5ented-

(b) No drain;linesse8ers a66ected b> t,e 8or3 s,all be sealed o66 8it,out prior

and proper di7ersion o6 t,e a66ected drain;linesse8ers-

=" Ad%an'ed Se*er Conne'tions

T,e ends o6 ad7ance se8er connections and +;?unctions 6or 8,ic, 6uture connections arepro7ided 6or are to be satis6actoril> sealed 8it, appro7ed 5aterial- ,ere applicable5ar3ers (ti5ber or ot,er8ise) are to be labelled clearl> and erected accuratel> to 5ar3 t,eends o6 ad7ance connections and +;?unctions- T,e 5ar3ers are to be 6ied into t,e 4roundin a 5anner t,at t,e> 8ill not be easil> re5o7ed-

=" Sae Wor+in. in Conined Sa'es

(a) All sa6et> reBuire5ents 6or 8or35en 8or3in4 in se8ers pu5pin4 5ains c,a5berssu5ps and ot,er con6ined spaces includin4 t,e pro7ision o6 adeBuate 7entilation andnecessar> apparatus as stipulated b> t,e Ministr> o6 Manpo8er s,all be strictl>co5plied 8it,-

(b) Appro7al 6ro5 ater Recla5ation (Net8or3) Depart5ent ("') s,all be obtained

prior to carr>in4 out an> se8er connection 8or3s in t,e public se8era4e s>ste5-

=" Settin. Ot

T,e se8er s,all be properl> set out be6ore an> 8or3 co55ences-

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="H Pie eddin. *it/ Gran(ar Materia(

(a) T,e beddin4 6or t,e pipes s,all be t,orou4,l> co5pacted- T,e pipes s,all belaid e7enl> on t,e barrel at t,e reBuired le7el- T,ere s,ould be no ,ollo8s 7oids or6orei4n 5aterials under t,e pipe- An> concrete bloc3s or 8ed4es s,ould be re5o7ed onco5pletion o6 beddin4-

(b) "articular care 5ust be ta3en to ensure t,at proper beddin4 is obtained at andon eit,er side o6 t,e pipe ?oints- ,ere pipe ?ointin4 ,oles are le6t in t,e beddin4

particular care 5ust be ta3en to ensure co5plete and proper 6illin4 o6 t,e ,oles a6terpipe testin4-

="10 Con'rete ed8 ?an'/in. and Srrond to Pie

(a) T,e concrete used 6or t,e concrete bed 6oundation s,all be 8ell ra55ed or7ibrated and 8or3ed under and around t,e pipes-

(b) At approi5atel> e7er> 6our pipes or ! 5etres 8,ic,e7er is t,e less inter7al a?oint s,all be 6or5ed in t,e concrete bed or surround b> 7erticall> s,utterin4 t,e bedor surround 8it, 2. 55 t,ic3 6ibreboard ti5ber or ot,er appro7ed 5aterials- T,es,utterin4 5aterial s,all be le6t in to 6or5 a per5anent ?oint- ,ere t,e concrete bedis reBuired to be rein6orced all rein6orce5ent s,all stop on eit,er side o6 t,e ?oint-

="11 Pie (a6in.

(a) All pipes s,all be care6ull> brus,ed out inside and s,all be tested 6or soundness be6orebein4 laid- T,e pipes s,all be laid separatel> to true in7erts strai4,t lines and 6allseac, pipe bein4 separatel> boned bet8een si4,t rails and bearin4 e7enl> upon t,e solid4round or concrete 6or its 6ull stren4t,-

(b) ,ere pipes are laid 8it,out a concrete bed ,oles s,all be cut in t,e botto5 o6 t,etrenc, o6 suc, si@e and dept, as to allo8 t,e ?oints to be properl> 5ade and t,e barrelo6 t,e pipe to bear e7enl> on t,e solid 4round 6or its 6ull len4t,-

(c) ,ere pipes are to be laid on roc3 6or5ation t,e eca7ation s,all be ta3en do8n to10055 belo8 bed le7el and 4reat care s,all be ta3en to ensure t,at t,ere are no

pro?ectin4 pieces o6 roc3 on 8,ic, t,e pipe 8ill ride- T,e bed 8ill t,en be 5ade up toits true line and le7el b> re6illin4 8it, eit,er 100 55 o6 consolidated selected 5aterial6ro5 t,e eca7ations 8ell ra55ed and 8atered i6 necessar> or 8it, 10055 o6concrete 4rade 1.-

(d) All bloc3s and 8ed4es are to be o6 su66icient si@e and stren4t, to pre7ent settle5ent o6t,e pipes-

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="12 Testin. o Water-ti./tness o Se*ers

(a) All 4ra7it> pipelines and se8ers belo8 !00 55 in dia5eter be6ore bein4surrounded and co7ered s,all be tested b> 6illin4 8it, 8ater- T,e pressure s,all be5easured 6ro5 t,e ,i4,est point o6 t,e pipeline under test and s,all be 1-. 5etre ,eado6 8ater- "ipelines s,ould not be accepted until t,e> ,a7e 8it,stood t,e reBuired

pressure 6or %0 5inutes 8it,out a loss in ecess o6 112 litres 6or 100 5 6or eac, %0055 in dia5eter-

(b) e8ers o6 !00 55 and abo7e in dia5eter need not be ,>draulicall> tested-T,e> s,all be inspected b> CCT/ inspection or 6or 5an;entr> se8ers 5anualinspection s,all be carried out-

="1< Testin. o Water-ti./tness P!in. Mains

(a) All pu5pin4 5ains o6 !00 55 or less in dia5eter s,all be tested ,>draulicall>in con7enient len4t,s be6ore bein4 co7ered up- ater s,all be 6orced into t,e pipes b>5eans o6 a 6orce pu5p 6itted 8it, a pressure 4au4e to indicate t,e pressure at t,elo8est point o6 t,e section under test- T,e test pressure s,all be 1-2 N55 2 6or allclasses o6 pipes-

(b) 'e6ore an> test co55ences t,e trenc, i6 t,e pipeline is under4round is to bepartiall> bac36illed to co7er t,e pipes but lea7in4 t,e ?oints eposed 6or inspection andrepairs or re5edial 8or3 8,ere necessar>- An> ?oints not passin4 t,e test s,all bere6itted cut out or replaced- No 5ec,anical caul3in4 s,all be allo8ed- ,ere t,e

pipelines are abo7e 4round anc,or bloc3s and ot,er supports s,all be pro7ided priorto testin4-

(c) T,e 5et,od o6 6illin4 t,e pipes and arran4in4 t,e test 5ust ensure t,at all t,eair is epelled 6ro5 t,e pipeline and ?oints be6ore an> pressure is applied- Air and

pressure release coc3s s,all be pro7ided 8,ere7er necessar>-

(d) T,e testin4 pressure s,all be pro7ided 8it, an isolatin4 7al7e 8,ic, 8,enclosed s,all lea7e t,e pressure 4au4e connected to t,e len4t, o6 pipeline under testand at t,e sa5e ti5e isolate t,e pu5p- ,en t,e speci6ied pressure ,as been reac,edt,e isolatin4 7al7e s,all be closed and re5ain closed 6or %0 5inutes- At t,e end o6 t,atti5e i6 t,e pressure ,as dropped t,e isolatin4 7al7e s,all be opened and t,e loss o68ater deter5ined b> pu5pin4 into t,e 5ain a 5easured Buantit> o6 8ater su66icient to

brin4 t,at pressure up a4ain to t,e initial pressure-(e) I6 t,e loss o6 8ater so deter5ined is at a rate less t,an 10 cc per 55 dia5eter

per 35 o6 pipeline 6or %0 5inutes t,e test s,all be considered satis6actor>-

="1& Man/o(e Constr'tion

(a) C,a5ber and s,a6t rin4s 5a> be supplied in di66erent len4t,s and eac, section8ill be pro7ided 8it, li6tin4 ,oles- T,e tapers to be used 8ill be o6 a 6ied len4t,- T,e

?oints bet8een t,e sections s,all be o6 an o4ee 6or5- Eac, section s,all be set upaccuratel> in position 5a3in4 t,e o4ee ?oint 8it, ce5ent 5ortar to 6or5 a 8aterti4,t

?oint- 'e6ore co5pletion o6 t,e 5an,ole all t,e li6tin4 ,oles o4ee and ot,er ?ointss,all be neatl> pointed-

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(b) T,e rein6orced concrete slabs co7erin4 t,e c,a5bers and t,e s,a6ts o6 t,e5an,oles s,all be set and pointed in ce5ent 5ortar to 6or5 8aterti4,t ?oints-

(c) At all points 8,ere pipes are built into concrete 8alls or 6loors 4reat cares,all be ta3en t,at t,e ?oint is 8aterti4,t- I6 6ound to be ot,er8ise t,e concrete s,all

be cut a8a> and replaced 8it, concrete to 5a3e a 8aterti4,t ?oint-

(d) Man,ole co7ers and 6ra5es are to be set in ce5ent 5ortar and surrounded 8it,4rade 20A concrete and co7ers le6t 6lus, 8it, t,e surroundin4 4round or road sur6aceas t,e case 5a> be and s,all be set on t8o courses o6 22.55 bric38or3- T,e 6inead?ust5ent o6 co7er le7els s,all be e66ected b> creasin4 courses o6 ,ard burnt tile-Care s,all be ta3en to ensure t,at t,e co7er is le7el and sloped to an> 6all or 4rade int,e surroundin4 sur6aces-

="1= a'+dros and T!#(in. a6s

,ere 'ac3dropsTu5blin4 'a>s are used t,e pipes are to be built in t,e 8alls o6 t,e5an,ole b> cuttin4 a neat ,ole in t,e precast concrete rin4s su66icient 6or buildin4 in t,e

pipes and pointed in ce5ent 5ortar- T,e ?oint s,all be 6inis,ed 6lus, 8it, t,e inside o6 t,e

5an,ole and neatl> spla>ed on t,e outside to 6or5 a 8aterti4,t ?oint-

="1 Inse'tion o Co!(eted Se*ers

(a) All co5pleted se8ers are to be inspected to ascertain t,at t,e pipes are entirel>clear o6 obstruction t,at t,e in7ert is s5oot, t,at t,e ?oints are properl> constructedt,at t,ere are no de6ects etc-

(b) In cases 8,ere t,e pipes cannot be inspected 6ro5 t,e inside 4enerall> under!0055 in dia5eter a loose plu4 s,all be passed t,rou4, eac, pipeline to ensure t,att,e pipes are entirel> clear o6 obstruction and t,at t,e in7ert is s5oot,- T,e loose plu4

s,all be in t,e 6or5 o6 a c>linder 8it, solid ends 5ade o6 ti5ber not less t,an 2.55 int,ic3ness-

(c) In cases 8,ere t,e se8ers are !0055 and abo7e but lesser t,an 90055 in dia5eterCCT/ inspection s,all be carried out to inspect t,e co5pleted se8er- ,ere t,ese8ers are 4reater t,an 90055 7isual inspection 6ro5 t,e inside o6 t,e pipes s,all becarried out-

ANNE> $ STANDARD DRAWING ON PRO;ISION OF AD;ANCE

CONNECTIONS TO 3OT ONDARIES FOR SEWERDI;ERSION WORK )DRAWING NO" =-1,

copssw nov2004 (1).doc

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