Re: ASME RF Flange Joint using Spiral Wound Gasket

From: <shivakumar>
Date: Tue Nov 13 2007 - 02:12:00 EST

Use A 193-B7M bolting material instead of A 320 Gr. B7M material. There is nothing wrong with gasket material specificaition.

Thanks,

Shivakumar Angadi

• sviswan@technip.com wrote:

>
> 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.
>
>
      

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