SA-36 for pressure piping prohibited?

[JAYDEE23]

We manufacture pressure piping under Section 1, B31.1, and B31.3.

I can not find in any of these codes where SA-36 is EXPLICITLY prohibited. I find lots of implied text, but no smoking gun. Can anyone point me in the direction or explain to me why SA-36 should not be used for rolled and welded pressure pipe?

 

[weldstan]

It can be. A-36 is listed as plate material in both Codes and may be used to make pipe. Both Codes limit design temperture.

 

[Fizza453]

SA-36 cannot be used for pressure parts in Section I applications except under the provisions of PG-13.
SA-36 cannot be used in B31.1 applications for BEP, I dont have B31.1 with me at this time, please see the allowable stress tables in B31.1, there you will find a note against SA-36 that prohibits its use for BEP.
BEP means boiler external piping as defined in PG-58 of Section I.

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

 

[JAYDEE23]

Thanks Guys!

 

[metengr]

The problem is A/SA 36 is listed as plate material or under bars and shapes for use in B31.1. To make rolled and seam welded pipe from A 36 plate would require reference to A 36 plate specification as an acceptable plate material specification for use in fusion welded piping. There is no reference to A 36 in fusion welded pipe specification (i.e., SA 671).

 

[JAYDEE23]

Why would B31.1 Specifically exclude SA-36 from being used for BEP?

I can not find text explicitly allowing or excluding the use for say NBEP.

We use SA-516 gr 70 but this has got me curious and i would like to know.

 

[metengr]

B31.1 power piping committee is very conservative by design. What I was trying to state in my previous post was that rolled and fusion welded pipe will be supplied by a particular specification. In this case, you have either A 139 or A 671 type material specifications for which seam welded pipe is supplied.

If you review the above specifications, reference is made to either a particular plate specification or plate chemical requirements and mechanical property requirements for use in manufacturing the pipe. SA or A 36 plate specification in of itself is not listed. However, for A 139, the material specification does provide chemical composition requirements for the plate used to form seam welded pipe (4" NPS and larger). This is where you may be able to use carbon steel plate that could possibly meet the chemical and mechanical property requirements for A 139. Although, this pipe specification does not have an ASME SA specification.