Flange Bolting Torque

[DK44]

While assessing Girth Flange Bolting torque, is it necessary to calculate the torque for Hydro test condition and apply it before Hydro test and leave the flanged joint in that condition for directly commissioning.

 

[TGS4]

No. See ASME PCC-1.

 

[SnTMan]

Torque it. Test it. Ship it.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

Successful completion of a hydrostatic test is not considered sufficient evidence to confirm the acceptability of an
assembly procedure.

See ASME VIII Div 1 App 2: The required bolt load for the operating conditions Wm1 shall be sufficient to resist the hydrostatic end force H exerted by the maximum allowable working pressure on the area bounded by the diameter of gasket reaction.

Regards
r6155

 

[DK44]

Thank you r6155.
Wm1(if governs), with Hydro-static test pressure (1.3 x Design pressure) will be higher than with Design pressure, and so the Bolting Torque. During the Hydro test is it not necessary to tighten the Flange Bolts to Torque with Hydro-static test consideration?

 

[r6155]

DK44
Try to understand the ASME CODE
Do you need to change the shell thickness due to hydrostatic test?, obviously NO

Regards
r6155