×
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

Do ASME B16.5 flange ratings include NEMA SM23 swings?
3

Do ASME B16.5 flange ratings include NEMA SM23 swings?

Do ASME B16.5 flange ratings include NEMA SM23 swings?

(OP)
NEMA SM23 allows variations in steam pressure and temperature to exceed maximums by 20% pressure and 50 deg F.  Do the ASME B16.5 ratings include these swings or are the B16.5 values absolute maximums?  For A-217 GR WC9 (material group 1.10) Class 1500# at 950 F, the allowable pressure is 1885 psig. If the piping design requires 1750 psig @ 950 F is a 1500# flange acceptable or do you have to apply the NEMA variations?  Applying the +50 F temperature variation would force a the design into a class 2500# flange as a 1500# flange at 1000 F has a rating of only 1305 psig.

RE: Do ASME B16.5 flange ratings include NEMA SM23 swings?

NEMA SM23 is for steam turbines.
ASME B16.5 is for pipe flanges.

As long as your design pressure @ temperature falls below the ASME B16.5 class, that is it, as I interpret it.

Perhaps my mechanical colleagues can provide more information.

"Do not worry about your problems with mathematics, I assure you mine are far greater."   
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

RE: Do ASME B16.5 flange ratings include NEMA SM23 swings?

2
Your piping code, ASTM B31.3 or B31.1 defines the allowable short term conditions that exceed the design values.

NozzleTwister
Houston, Texas

RE: Do ASME B16.5 flange ratings include NEMA SM23 swings?

If you are in Canada, CSA Z662.03

"Do not worry about your problems with mathematics, I assure you mine are far greater."   
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

RE: Do ASME B16.5 flange ratings include NEMA SM23 swings?

btu....

Nozzle is correct.....it is the piping code of record that defines maximum pressure/tempersture transients above design

Give him a star !!

-MJC

  

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