U-3 Standard Refferenced by This Division.

faizol · **Posted:** Tue Oct 27, 2009 11:43 am

Dear Members,

As per ASME Section VIII Div.1 part U-3, acceptable edition (year) for various standard to refer pressure-temperature rating, dimensional & etc. like ANSI are listed in table U-3. Refer to ASME B 16.47 "Large Diameter Steel Flange NPS26 to NPS 60", latest edition is 2006 but in table U-3, acceptable edition is 1996.

The question is, could we use latest edition?

Kindly, you all prompt respond are appreciated.

Thank you.

sanjeev_shukla70 · **Joined:** Wed Apr 18, 2007 2:05 pm **Posts:** 260

Answer is "NO". You can follow the edition which is referred in ASME Sec VIII Div 1 and not the latest one.

In order to avoid such problems, in the year 2006 ASME Committee had proposed to include a section as below but not sure whether it is included in the latest edition or not;

Quote:

Flange ratings for ASME B16.5 - Pipe Flanges and Flanged Fittings, B16.34 ? Valves, Flanged, Threaded, and Welding End (Standard Class only), and B16.47 ? Large Diameter Steel Flanges were all determined using the same method and material properties. The intent is that flange ratings be the same for all materials covered by any of these standards whenever the ratings are updated. However, due to delays in balloting, publishing and other issues, not all these standards are published concurrently as intended. Whenever a new edition of B16.5 or B16.34 is published it is intended that the ratings for all three standards be in accordance with this new edition effective immediately even though publication may be delayed for any of the other two standards

Regards

faizol · **Posted:** Sat Oct 31, 2009 9:21 am

Dear Mr. Sanjeev,

I heard from someone that latest edition 2006 can be use because the nominated edition of 1996 is an indicated at U-3 is considered the minimum acceptance, where you are allowed to use the newest editions comes after 1996 edition and in no way to use the old editions came before 1996.

Question is why ASME do their best to issue the newest editions of codes & standards if they are not for use? and when we shall use the newest editions?

Thank you.

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

faizol wrote:

Dear Mr. Sanjeev,

I heard from someone that latest edition 2006 can be use because the nominated edition of 1996 is an indicated at U-3 is considered the minimum acceptance, where you are allowed to use the newest editions comes after 1996 edition and in no way to use the old editions came before 1996.

Question is why ASME do their best to issue the newest editions of codes & standards if they are not for use? and when we shall use the newest editions?

Thank you.

Of course if the new edition is more restrictive you may use it, but you have to verify it. So there is no advantage.
Each construction Code Section has a (sub)Committee who discusses the new referenced standards before accepting them. Consequently referenced standard new issued cannot be addressed immediately but only after reviewing balloting and accepting by the Committee.
mauro

sanjeev_shukla70 · **Joined:** Wed Apr 18, 2007 2:05 pm **Posts:** 260

Faizol,

Unfortunately code does not go with the intent. What ever is written in black and white is the Bible. I myself had a case where I was not allowed to use flange ratings for ASME B 16.47, same as of B16.5 ed 2003 since 1996 ed of B16.47, having slightly different pressure rating (since pressure rating of B16.5 were slightly modified in 2003 ed) was indicated on ASME Sec VIII Div 1.

That matter was raised to code committee and isnpite of having the intent to follow same pressure ratings for both the B15.5 and 16.47, it was of no help to us unless an addenda/ revised ed incorporating the same is issued.

Excerpts in my earlier post were received from code committee for the same problem.

Unfortunate but intent does't work.

Regards

Sanjeev

U-3 Standard Refferenced by This Division.

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