ASME SEC II-D, TABLE 2A

[wml33]

Can anyone provide information on the basis for the reduction of stress intensity values for SA403, WP316 material in Table-2A (400F-800F)in the 1993 Addenda of the ASME Code? NOTE: per the summary of changes, it says this is an errata change.

 

[samuelliu]

I have 1995 ed but not sure if they were updated in 1994 addenda.

 

[johnnymist2003]

Hi,

the latest edition of ASME II D is 2001, Addenda 03. You should be using these editions for ant new work being carried out as vessels, etc are required to be designed to the latest editions of the code. In 2000, there were major changes to the code allowable stress values for a lot of the materials listed in ASME II D.
John

 

[jsummerfield]

johnnymist2003 addresses the technical issue without knowledge of your contract. It is common for project applications to specify the applicable codes and standards based upon the edition affective at the date of the contract signing.


John

 

[deanc]

jsummerfield-In the ASME world johnnymist is correct. For a vessel constructed today you must use current code and addenda. There can be time frame considerations for contracts. But this has to be reasonable. 1993 is a long stretch. I doubt anyone would accept this.

 

[GRoberts]

Deanc/jsummerfield,

I don't really know how it works since I'm not in design/engineering of components, but does it matter which section of the ASME code you are working to? We get orders for parts made to ASME Section III code from 1971 to current. It's up to our customer to tell us what they want, but most of them specify older codes most of the time.

 

[johnnymist2003]

Hi GRoberts,

I cannot comment on the use of current code versions for ASME III applications as I am mainly involved with ASME VIII vessels. Notwithstanding this, in ASME Section VIII, Div 1, Foreword, it says "After Code revisions are approved by ASME, they may be used beginning with the date of issuance shown on the addenda. Revisions, except for revisions to material specifications in Sections II, Parts A & B, become mandatory 6 months after such date of issuance, except for boilers or pressure vessels contracted for prior to to the end of the 6 month period." I would check with the Section III code to see if there is a similar sentence. Based on my knowledge, I would doubt if Section III is any different. There should also be some guidance listed in the laws of your local authority. The AI would also have some views on this also, I'm sure. I must admit, I have never come across a situation where a customer wants his new vessel built to an older code edition. With improvements in technology it would seem a bit silly to do this, as the customer would then lose out on advancements that have been made in the Codes. What I have found, though, is that some customers, being just "users" of the equipment and not really involved in the design and manufacture, are sometimes not fully versed in the requirements of the Codes. In these instances, I believe that it should be up to the designer/manufacturer to enlighten his customers - after all, if there is a failure and someone gets hurt/injured (heaven forbid) the designer/manufaturer is not absolved of the responsitbilty for the failure, if it can be proven that he has been negligent because he hasn't done something that he should have (but this is another discussion completely and we could debate this for hours on end). Also, from my knowledge, manufacturers of pressure equipment would be expected to be versed in the code, and to have copies available for the inspector. Just my two cents worth.
John.

 

[johnnymist2003]

Hi again,

just to clarify my previous post - I am not implying in any way that using an earlier version of the Code will result in a failure.
John

 

[bvi]

I have not gone back and checked the change, but an "errata" change is basically a change to correct an error that occured in the publication process (including some errors handed to ASME publications by committee members). Based on this, I would expect that an earlier edition had the correct stress value, it was erroneously changed, and the errata change would be to change it back. Errata changes are not changes to code rules (such as a change in the allowable stress would be), they are correction of typo type errors.