[MW:13561] RE: 13558] Gasket fixing with grease

Dear Jestin,

Pls. refer ASME PCC -1, 2000 : “Guidelines for pressure Boundary Bolted Flange Joint assembly”

Which says Do not apply lubricant to the gasket or gasket contact surfaces. Refer the scope below as well

Pls. refer the below extracts of ASME PCC-1, hope its helpful

7 LUBRICATION OF “WORKING” SURFACES

With one exception, liberally coat all internal and

external thread surfaces and nut washer faces with

appropriate lubricant; the exception is: lubricant is

not to be applied to these ”working” surfaces for

the initial tightening of new, coated bolrs/nuts [see

Note (3) of Table lM/Table 11. The torque values

for new, coated bolts/nuts shown in Table 1 M/Table

1 do not consider lubrication other than that provided

by the bolt nut coating [see Note (2) of Table 1M/

Table 11. Do not apply lubricant to the gasket or

gasket-contact surfaces.

(a) Ensure that the lubricant is chemically compatible

with the bolt/nut/washer materials and the process

fluid. Particular care should be taken to avoid

lubricant chemistry that could result in stress corrosion

cracking.

(b) Ensure thathe lubricant is suitable for the

expected service temperatureW.

1 SCOPE

The bolted flange joint assembly (BFJA) guidelines

described in this document apply to pressure-boundary

flanged joints with ring-type gaskets that are

entirely within the circle enclosed by the bolt holes

and with no contact outside this circle.’ By selection

of those features suitable to the specific service or

need, these guidelines may be used to develop

effective joint assembly procedures for the broad

range of sizes and service conditions normally encountered

in the process industries.

Cheers

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of jesti fer
Sent: Tuesday, January 24, 2012 5:50 PM
To: materials-welding@googlegroups.com
Subject: [MW:13558] Gasket fixing with grease

Dear Experts,

I need your suggestion for this matter, During the hydro test preparation in CS Pipe (ASTM A106Gr.B) Sub-contractors are fixing the ring gasket with grease, It is acceptable, it is mentioned anywhere in the code, We are following B31.3

Any type of gaskets can fix with grease for hydrotest?

Kindly help me

Jestin

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