Large Diameter Pipe Spec

[ReverenceEng]

So I am wondering on the spec for large diameter NPS pipe, such as 30".

For example and clarity of my question, standard pipe under 12" conforms to ASTM A53 (usually Gr. B), HSS to A500 (usually Gr. B or C), but what about these larger pipes? They are usually manufactured to an fy=42 ksi min, which is equivalent to the A500 Gr. B for Round HSS, but I thought A500 didn't quite cover the spectrum that these larger pipes can come in (doesn't A500 only go up to about 7/8" wall?) and not sure it would even be the right call-out...

Any thoughts? Thanks!

 

[rdubs]

Take a look at ASTM A-134 and A-135. Pipe in large sizes is very application-specific (made to order).

 

[azcats]

What's the application?

You might be well served to multi-spec the pipe so that the customer doesn't have to get a piece custom made - especially if it's a one off application. There are surplus markets of large diameter pipe in a variety of grades/specs.

See link for the variety of specifications available for manufacture.

http://www.pittsburghpipe.com/products/billboard-sign-posts/

 

[dhengr]

ReverenceEng:
Azcats is right on the money on this, and offers a good example link. In cases like this, you should ask a few local suppliers what’s available in 30" dia. and design around that. Then spec. it as such-n-such, or equal, subject to approval by the EOR. As he suggests, you are often using surplus oil pipeline pipe, still perfectly good for our needs, not scrap or junk. You might have to go half way around the world for one piece of some particular spec’ed. pipe.