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Substituting DSAW for ERW B31.3

Substituting DSAW for ERW B31.3

Substituting DSAW for ERW B31.3

(OP)
Hello All,

Background: Released a bill of materials to purchasing to get ahold of all the long lead items for a project about 6 weeks ago. Included was a 40' lenght of NPS 48 API 5L Gr. B ERW SCH XS (0.50" WT) pipe. Piping design code is B31.3 Normal Fluid Service.

The Fumble: Purchasing decided (in a vaccum) that this was a commodoty stock item and they would order it when needed instead of when the bill was realeased.

THE FIREY INFERNO: No one has a peice of the pipe listed on the bill in stock and now I have to determine if the piece they want to substitue is acceptable.

The proposed substitution is API 5L DSAW (0.587" wall). I am still trying to an answer on the grade ( I am very suspicios this may be a high allow pipe left over from a pipeline job as the wall thickness is rather odd).

My real question is can I substitue DSAW for ERW pipe?

B31.3 table A-1B lists an Ej factor of 0.85 for ERW and 0.95 for EFW, double butt, straight or spiral seam. The nomenclature between B31.3 and API 5L are not quite the same and I am somewhat confused on the matter. It looks like DSAW falls into EFW and the Ej factor should be 0.95, however I am not positive and will not allow the substitution ontil I am sure of its acceptability.

The pipe will be joined to A53 Gr. B branch connections and an A105 Flange and an A234 WCB Cap

Any guidence from an experienced hand would be greatly appreciated.

A question properly stated is a problem half solved.

Always remember, free advice is worth exactly what you pay for it!  

http://www.ap-dynamics.ab.ca/

RE: Substituting DSAW for ERW B31.3

If you mean 48" diameter; you don't have a choice, other than straight seam or spiral DSAW. I may be obsolete, but I doubt there is any ERW > 30". And seamless limited to 24". Any updates ?
Straight seam was a lot easier for NDE.

RE: Substituting DSAW for ERW B31.3

You do not state the grade. Is it 5LX-65 or -70? Is it 5LB or X42. In any event, if it is listed in B31.3, it may be used and it can be readily welded to the other carbon steels stated. DSAW is EFW.

RE: Substituting DSAW for ERW B31.3

(OP)
Hello All,

Stanweld, I had stated I was trying to determine the grade and I just found out the grade is Gr. B/X42. Thank you for your response as I was mostly concerned with the joint efficiency factor.

In this case EFW = 0.95


 

A question properly stated is a problem half solved.

Always remember, free advice is worth exactly what you pay for it!  

http://www.ap-dynamics.ab.ca/

RE: Substituting DSAW for ERW B31.3

Process Industry Practice PIP PN01CS1B02 December 2009 Piping Material Specification Line Class 1CS1B02

ASME B31.3-2008
CS, DSAW, API 5L-B, PSL2, single straight seam (Ej=0.95)


 

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