×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Sprial Wound Gasket vs Sheet Gasket

Sprial Wound Gasket vs Sheet Gasket

Sprial Wound Gasket vs Sheet Gasket

(OP)
I'm trying to make several Piping Material Class (PMC).

Is there a rule when do we select to use spiral wound gasket or sheet gasket in a PMC?

RE: Sprial Wound Gasket vs Sheet Gasket

The folks at flexitallic claim that spiral-wound gaskets are better in a thermally cycling service than sheet gaskets.  Given the trouble with cold flow that PTFE has this could be reasonable.  I have been replacing my PTFE gaskets with spiral-wounds in thermal cycling service for about three years with good results so far.

RE: Sprial Wound Gasket vs Sheet Gasket

I believe from memory, that sheet gasket is not recommend about about 2 MPa.

Sheet gasket is relatively cheep and useful in relatively 'easy' applications (ie low temp, low pressure, 'safe' fluids, etc).

RE: Sprial Wound Gasket vs Sheet Gasket

Have a read in ASME B31.1, table 12 for where to use each respectively.

rmw

RE: Sprial Wound Gasket vs Sheet Gasket

IAside from the temperature and pressure consideration you have to pick the filler, Teflon, carbon, mica, etc. This very critical in some application high temperature oxidizing fluids carbon is a no no. If the flange is marginal then try to go with carbon.
Watch out on 3" and 8" Class 150 SS flanges.
Picking the right gasket is about 2/3's of have a satisfactory joing the other is monitoring their use in the field,

Addenda:
We have a system where we have a highly oxidizing  1200°F, NOX, gas at 250 Psig and we spec. spiral wound gaskets, mica filled. I happened to hear a conversation about slugging down a 24" Class.  600 flange. Further inquiry led to fact that the gasket started leaking the second day after  startup and had steadily gotten worse. I convinced them that the unit had to come down as something was bad wrong.  When the flange was broken there was nothing but spirals no filler. 6 other flanges were examined and all had the wrong gasket, all had graphite filler. All but one was holding with nothing but the spirals. These gaskets have the inner ring.  


   

RE: Sprial Wound Gasket vs Sheet Gasket

(OP)
thank you all.

ASME B31.1, table 112 is quite informative

now I got some reference where to start reading about gasket.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources