ASME RF Flange Joint using Spiral Wound Gasket

I am trying to use a spiral wound gasket of SS316 windings and CNAF filler with outer centering ring for a class 150 CS pipe class.

The joint under went a check for leak tightness using the CAESAR II module for a joint of NPS 6 ASME B16.5 Class 150 RF Flange.

The bolt is ASTM A320 Gr B7M, the line is a SOUR service one. The flange material is A105N.

The ASME values of y and m of 10000 psi and 3 respectively results in the bolt load not being adequate for the sealing.

Is the 10000 psi the minimum required for the sealing spiral wound gasket?

I have gone through the technical article titled designcriteria.pdf on the flexitallic website.

Can any one please suggest a recourse to this. Is the use of spiral wound gasket advisable on the class 150 flange joint.

Sajit Viswan
Piping materials engineer
Technip Abu Dhabi

Save a tree...please don't print this e-mail unless you really need to. Received on Tue Nov 13 02:06:00 2007