×
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

ASME B16.34 LAST EDITION vs 2004 EDITION

ASME B16.34 LAST EDITION vs 2004 EDITION

ASME B16.34 LAST EDITION vs 2004 EDITION

(OP)
Hi,
We have received an offer from one of our supplier for gate valves. He have stated that the valves are offered according to ASME B16.34 last edition except for paragraph 6.1.2 that remains as stated in 2004 edition.

By comparing the two editions, I found differences in tables 3A/3B for valves minimum thicknesses for some diameters and series.

However, the diffrence is not so significant for example for NPS 24" serie 600# :
In edition 2004, min wall thk is 43.2 mm
In edition 2009, min wall thk is 43.3 mm

The difference is 0.1 mm. This difference can be covered by fabrication tolerances.

So, I would like to now:
1- If it is a unique difference between the two editions of ASME B16.34 for this paragraph 6.1.2?

2- If not, what are the other differences?

Thanks.

RE: ASME B16.34 LAST EDITION vs 2004 EDITION

Hello,

The big changed occurred in 2009. Paragraph (c) was added that required many valves of "multi-piece construction" to have thicker walls in the center body section because the "d" was no longer based on the valve port size (just for the center section, not the end pieces). Not sure how this applies to a typical gate valve as the paragraph was primarily focused on 3-piece ball valves. Most gate valves have bolted or pressure seal bonnets and would not fit the intent of this paragraph.

So working with the older revision (2004), the wall thickness of the center section was still the port diameter or 90% of the port diameter. Since then, the internal diameter of the center section determines the wall thickness of that part of the valve.

Since your supplier has his casting patterns and tooling already paid for, and the valves most likely have a history of successful use, the supplier is unwilling to spend more money to get new casting patterns and machining tooling because the committee responsible for maintaining this standard made a change that unintentionally caused a problem for them.

Hope this helps.

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