tues 10.35 should blowout preventers and f&g systems be sil rated for offshore j singh

8/10/2019 Tues 10.35 Should Blowout Preventers and F&G Systems Be SIL Rated for Offshore J Singh

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risk management and assessment for business

Advances in ProcessControl 9

20 September 2011, York, United Kingdom


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Advances in Process Control 9 Jaseet Sing!

APC9

Are Blowout Preventers and Fire & Gas Systems ready tobe classifed as Saety Instrumented Systems on osore

installations!

Presented By"

#as$eet Sin% MCMI, AMIChemE, MBA, BE (Chemical)Senior n%ineer' (is)tec Solutions *imited


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APC9

+b$ectives

Introduce briefly to Blowout Preventer (BOP), and Fire and Gas Systems (FGS) inoffshore oil & as installation conte!t"

Sim#listically evaluate the Safety Interity $evel (SI$) these systems would be

e!#ected to achieve" and,

%iscuss if these systems should be desinated as Safety Instrumented Systems(SIS)"

%iscuss challenes' in u#radin BOP and FGS to SIS status


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APC9

Functional Saety ,efnition

-at is Functional Saety!

"!e ind#str$ standard %&C '1(11 de)nes it as Functional safety ispart of the overall safety that depends on a system or equipmentoperating correctly in response to its inputs.

&*ample+

An overtemperat#re protection device, #sing a t!ermal sensor int!e -indings o. an electric motor to deenergise t!e motor be.oret!e$ can over!eat, is an instance o. .#nctional sa.et$/

Specialised ins#lation to -it!stand !ig! temperat#res is not aninstance o. .#nctional sa.et$ alt!o#g! it is still an instance o. sa.et$and co#ld protect against e*actl$ t!e same !aard/


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APC9

Basic SIS Conf%uration

,etect

,ecide

.ecute

Sensor

lements Press#re

"emperat#re 3lo-rateComposition

*o%icControl

Sa.et$ P4C 5ela$ 4ogic

Final lements 6alveAssemblies Circ#it 7reakers Po-er 8rives Secondar$S$stems


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APC9

Systems under te Scanner

Blow +ut Preventer Fire and Gas System


7/23Advances in Process Control 9 Jaseet Sing!

APC9

Blow +ut Preventer

A 7lo- #t Preventer 7P is acombination o. several valves

installed at t!e -ell!ead/

Function" Prevention o. escapeo. -ell :#ids .rom primar$containment

B+P /y0ical *ocation" 7eneat! t!e rig .or land rigs; At t!e -ater



APC9

-at a B+P *oo)s *i)e1



APC9

Sim0listic *+PA on a B+PSystem

Scenario

Une*pected release o. !ig! press#re gas in t!e reservoirinto t!e -ell ca#sing abnormal and s#dden increase in riserpress#re/ Potential .or release o. !ig! press#re oil > gas etat t!e plat.orm .rom t!e -ell 7lo-#t/

Conse2uences?#ltiple .atalities .rom )re @ e*plosion on t!e installation;?A""&

/ar%et Fre2uencyFactor

3e#ivalent to 10' per $ear

Initiatin% vent Une*pected -ell press#re d#e to acc#m#lated gas

Initiatin% ventFre2uency Factor

4e#ivalent to 1 in 1000 -ell sites

Conditional5odifers %gnition Control B 6o credit

&*pos#re B 6o credit



APC9

Sim0listic *+PA on a B+PSystem

Inde0endent Protection *ayers (is) (eduction Factor

BPCS%ndication o. press#re in t!econtrol room and process s!#tdo-n

7

Alarms4inked to t!e 7PCS s$stem B ot%ndependent

6

5iti%atedventFactor

' B D B 1 8

(e2uired SI* or cosen SIF 8

ence te :B+P System; may be re2uired to meet SI* 8 re2uirements+/I>G B?/ / *++P



APC9

B+P and FGS as SIS @ /e /woSides

A%ainst For3ield devices and tec!nologies are.#ndamentall$ di=erent

7#t t!e devices are available, and arebeing developed

ot be considered per.orming a criticalsa.et$ .#nction

"!e$ do/ &S8 is onl$ part o. t!e overallsa.et$ @ risk control

%&C '1(0 is not applicable Covers all &>&>P& s$stems///

"oo costl$ ot more t!an cost o. an accident

8iEc#lt to materialise &=ort s!o#ld be made B necessit$ ismot!er o. invention

5eg#lator does not -ant t!is Post 8-F, t!e$ domostl$

%nd#str$ !as been operating t!is -a$ BL!$ no-M Contin#o#s improvement



APC9

(ecommendations

il and gas ind#str$ s!o#ld e*plore t!e possibilit$ o.#pgrading t!e 7P and 3IS to S%S/

%&C, %nd#str$ and 5eg#lators s!o#ld redde)ne > amendt!e relevant re#irements to clari.$ t!e iss#e/

8esign engineers and sa.et$ cons#ltants s!o#ld bea-are o. t!e iss#e and endeavo#r to improve t!e sa.et$s$stem /



APC9

Closin% (emar)s

ot all sa.et$ s$stems are created e#al and ever$installation !as di=erent per.ormance, risks and )nancialgoals to meet/

Small regional operators are m#c! less likel$ to maket!is step c!ange in t!e -a$ t!e 7P and t!e 3IS aremanaged d#e to limited reso#rces/ %t is #p to globalorganisations to take t!is initiative, and raise standard o.best practice in managing t!ese s$stems/


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APC9

/an) Kou or Kour Attention

tues 10.35 should blowout preventers and f&g systems be sil rated for offshore j singh

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