technical specification (internal) coating on labyrinth seals (26!02!2013)

7/25/2019 Technical Specification (Internal) Coating on Labyrinth Seals (26!02!2013)

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TECHNICAL SPECIFICATION

(LABYRINTH SEALS)1. PRE-INSPECTION:

As the job arrives at our premises, after opening the casing we should check whether the jobhas any physical damage like cracks, major profile defects, etc.

a) In case the job is found damaged or the casing of the job found damaged, then inform to

the higher authority (of !s I") for the same # make a comment on the receipt slip."recede further process as per instruction given after then.

b) $heck that the job is in accordance to the drawing and inspect the damages or defects. If

they are repairable, then we can proceed for further course of action.

%therwise supervisor! project In&charge must inform the issue immediately to the

management (within ' hrs. from receiving the job).

2. REM

OVAL

OF

SHARP EDGES:

$hamfer the sharp edges from the job wherever found while inspection is In&progress.

emoval of sharp edges using grinding wheels is called as chamfering.

3. INITIAL ABRASIVE BLASTING:Initial abrasive blasting to be done by Aluminum o*ide abrasive particles, for making

rough +urface for the bond coating.

Note: lasting "ressure -! "#$%&2.

-or -ine lasting rit +i/e ' Me.

-or edium lasting rit +i/e. 2! Me.

-or $oarse lasting rit +i/e 1 Me.

0istance between the blasting no//le and job shall be *-1' +,%e.

oughness after blasting shall be more than * R &+%o,.

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DO/ DON/T/ REMAR"S

a) $heck for physical

damages like cracks,oil marks, rubbings,

etc.

b) ark the damagedareas for repair work.

+hould not proceed

further if any non&repairable or un&

acceptable problemsfound on the job.

1uality inspection

report shall be prepared by the 1$ "erson.




(LABYRINTH SEALS)

DO/ DON/T/ REMAR"S

Area which doesn2tre3uire coating shall

be covered by proper masking.

Initially clean the

abrasive particles by

passing thesethrough sieve. 4hen

do abrasive blasting,

for making roughsurface for the

coating.

Drawing No.: 5/16

asking must bedone in the re3uired

area only.

After abrasive

blasting, we should

get surface roughnesssame in all the areas.

After rit lasting,avoid touching the

blasted areas.

$heck for themasking area as per

re3uirement.

$heck for abrasive

blasting 3uality, as

after this somedefects can be seen.

If this happens then

rectify the same andreprocess the job.

5nsure that the blasted areas are free

from moisture, oil,

grease, etc.

. LOCAL 0OR" :

Initially mark the area to be repaired. If 4I welding is re3uired, 67 8i o having dia.

of '.7 to 9.6mm. ;arger dia. for larger fillings shall be used. aintain different parameters while welding like $urrent, <oltage (=7 to 67' 0$) as recommended.

+harp edges shall be chamfered for 6 to 6. mm chamfer distance.

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DO/ DON/T/ REMAR"S

a) $heck markings

which have been

done for repair,etc.

b) If repair work isto be done on

surface of

unner like 4Iwelding, use 67

8i o having

dia. of '.7 to

9.6mm.c) ajor dia. for

bigger fillings.

+hould not proceed

further if any non&

repairable or un&acceptable problem

found on the job.

>elding must be freefrom chatters, pits, pin

holes.

1uality inspection

report shall be prepared

by the 1$ dept.

0uring welding, try tomatch the surface with

the profile of the job so

that less grinding work or rework re3uire.

-usion of material must

be properly done by

maintainingrecommended current,

voltage (=7 to 67' 0$)




(LABYRINTH SEALS)

!. MAS"ING BEFORE BLASTING:

8earby area on which blasting is to be done shall be properly covered (masked).

4he masking shall not make any marks or any defects on the surface. asking may be

done using I sheets or poly&ethylene sheets.

*. CHEC"ING OF ROBOT PROGRAMMING:

obot programming shall be done according to the profile using obot. 4he same shall

be cross&checked on running condition with&out supplying any raw material, fuel, etc.

. COARSE BLASTING OF SELECTED AREA:

$oarse blasting on the selected areas shall be done before ?" coating is performed. 4hegrit used for blasting shall be fresh and free from foreign materials.

4he roughness value shall be more than = a microns.

oughness after this coarse blasting shall be inspected by the 1$ department.

. MAS"ING BEFORE COATING:

8earby areas on which coating is to be done shall be properly covered (masked).

4he masking shall not make any marks or any physical defects on the surface.asking may be done using I sheets or poly&ethylene sheets.

. COATING:?" $oating using 8ano&4uff 777 for a thickness of '@&97 microns shall be done.

oughness value shall be maintained for &. a microns.

NOTE: PERFORM denotes that the operation carried-out as per Technical Specification.

VERIFY denotes that the erification done for the a!oe perfor"ance as per TS.

#ITNESS denotes that the inspection carried-out !$ the %& En'ineer in the

presence of authori(ed person is accepta!le as per Technical Specification.

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(LABYRINTH SEALS)

S.No De%+4t+o, D5+,# No.

1 D5+,# o6 5e+,# R+,# 6o He7 Co8e 6o

HP-HVOP Cot+,# 96%e

P!$1*

2 Det+ D5+,# o6 0e+,# R+,# 6o He7

Co8e

P*$1*

3 D5+,# o6 Botto& 5e+,# R+,# 6o HP-

HVOF Cot+,# 96%e

P$1*

Det+ D5+,# o6 Botto& 5e+,# R+,# P$1*

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technical specification (internal) coating on labyrinth seals (26!02!2013)

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