RE : ASME RF Flange Joint using Spiral Wound Gasket

for 150 lbs flanges you have to use "Low stress" spiralwound gaskets. They have a y-value of 5000 psi. They have also a better performance if you use a Graphite filler.

Even a gasket cut from Graphite sheet gives mutch better results is this case : y-value of 2900 psi.

Kind regards, Met vriendelijke groeten,
Sincères salutations, Mit freundlichen Grüßen

René De Leener (Gsm +32 (0)475 833 054) Product manager flange gaskets

ERIKS nv
Boombekelaan 3
B-2660 Hoboken
Tel +32-3 829 2720
Fax +32-3 829 2721

ERIKS Louvain-la-Neuve
Avenue J.E. Lenoir 2A
B-1348 Louvain-la-Neuve
Tel +32-10 48 35 80
Fax +32-10 48 35 89
http://www.eriks.be <http://www.eriks.be/>

	 -----Message d'origine-----
	 De : PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com] De la
part de sviswan@technip.com
	 Envoyé : mardi 13 novembre 2007 8:06
	 À : PipingDesign@yahoogroups.com
	 Objet : [PipingDesign] 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

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[Non-text portions of this message have been removed] Received on Tue Nov 13 02:39:00 2007