×
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

NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

(OP)
Does anybody can help me out?
I am looking for RTJ Ring Gaskets for NPS 14 Thru 24 flanges with design pressure 5000 psi @ 400 degree F. Per ASME B16.5, the allowable pressure for CL 1500 is less than 5000 psi.
As 14"-24" CL2500 flanges are not listed in any Codes, the high pressure flanges need to be designed per App.2 of ASME VIII DIV.1 or other methods. Can we use the CL 1500 RTJ Ring gaskets? For example, use gasket R63 for 14" flange; use R67 for 16" flange; R71 for 18" flange; R75 for 20" flange; R79 for 24" flange under 5000 psi, 400F condisiton.
Thank you for your response in advance.

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

If the design + staic head is less than the flange rating you can use 1500 rating as well. Since the values so close, please have a thorough check. If the design aspect is OK, you need to get client appproval so that he does have any issue with his piping.

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

(OP)
Brkmech1234, thank you for your valued input.
Let me take a example for this: We have a pressure vessel, design pressure 5000 psi at 400 deg F. all other nozzle sizes less than NPS12" (these nozzles will have piping connections,) we can select 2500# flanges per ASME B16.5, and there are 2500# RTJ ring gaskets available as well. For 2500# flanges, MAWP will have about 5280 psi at 400 deg F. Now we need a access inspection opening NPS 14", but 14" 2500# is not listed in ASME B16.5. For this flange we can design per Appendix 2 of ASME VIII Div.1, but there is no 14" 2500# RTJ ring gasket available. Can we use a standard 14" 1500# RTJ ring gasket? if not what standard/ code can we follow to design a gasket that allows 5000 psi? (Note: the MAWP of 14" 1500# flange is about 3170 psi at 400 F.)

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

bwfs,
You can use 14" 1500# gasket if the gasket dimensions has been considered in design of flange as per ASME VIII Div2 .

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

Corresction to above post:

Please read it as ASME VIII Div1 .

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

(OP)
brkmech1234, thank you very much for your reply.
Based on what you said, through 14" 1500# RTJ ring gasket is for 14" 1500# flange (say the MAWP of the flange is 3170 psi at 400 F for SA105 material), the gasket itself can have pressure rating greater than 5000 psi. Do you have any reference support this?

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

It seams that you are at basic level of designing. Gasket does not have pressure rating truly as far flange design concerned. I suggest that you perform a manual calculation of flange as per Appendix 2. Then you will have more clarity.

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

(OP)
You mean we can select either 14" 150#, 300#, 600#, 900#, or 1500# RTJ ring gasket for a 14" 2500# flange (w/ blind) designed per Appendix 2? That seems doesn't make sense. Looking forward to your reply. Thank you!

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

bwfs,

As far as appendix 2 is concerned, rating of the gasket (dimensional standard) does not matter. It is concerned with ID and OD and gasket properties. You can use any dimensions of gasket (non standard) with a condition that the gasket should lie between flange id and bolting.


My explanation is not making any sense to you because you did not know what is there in appendix 2.

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

Since there is no standard for 2500# flanges above 12" NPS, you might want to take a look at the API 6A standard for 6BX flanges and use the data there as a reference. There are alternate joint designs to the typical ASNI and ASME flanges in these pressure ranges, and one or more the manufacturers (of which I am one) would be happy to offer guidance.

rmorgan@ltsenergy.com

Rick

RE: NPS 14 Thru 24 CL2500 RTJ Ring Gaskets

I did run (ASME-based)flange design calculations for NPS 14-Class 1500 RTJ WN flanges in order to determine MAWP and suitability for rating higher than Class 1500. Loading considered is internal pressure. No external forces/ moments taken into account. Details available upon request.

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