Pipe Schedule vs Material

[Kaplin]

How is the pipe schedule and the material related. If I specify 2 1/2" schedule 40 carbon steel pipe - do I still have to specify the material? Or is saying 2 1/2" ASME SA-106 sched 40 pipe redundant?

 

[MJCronin]

Kaplin,

When you state "ASME SA106" instead of "carbon steel" you are being more specific.......you are specifying a high-quality grade of seamless carbon steel. Other grades of carbon steel pipe, such as SA53 - Grade B and others could be substituted

(By the way, you should specify the grade of SA106 that you want......SA106 Grade "B" is in most common usage)

By "pipe schedule" make sure that there is no misunderstanding about what you mean...... to me, pipe schedule means wall thickness ( i.e. schedule 40 or 80 etc)

The words "line specification" or "line class"are commonly used to specify all of the materials and pressure ratings used in a particular piping system.

My thoughts only.....hope that this helps

MJC

 

Schedule and pipe material are related because of the pressure/temperature rating of the piping (what pressure can it withstand without failing). Using a design standard such as ASME B31.3 for example the correct wall thickness for a particular pipe material can be determined for a particular temperature/pressure. Pipe is available in standard wall thicknesses (schedules). A particular pipe diameter, material, schedule combination will have a particular maximum design pressure. If one was entirely sure that carbon steel of even the lowest possible quality would provide a pipe pressure rating above the maximum possible pressure in the system under consideration then one would have no need to specify the actual carbon steel quality specification. I would even then still not recommend leaving of the material specification - just say "SA53grB or better" and the fabricator will supply whatever he has available above the generally accepted minimum quality

 

[11echo]

Pipe schedule refers to the std. wall thickness that various manufactures fabricate pipe in. Material is the type of steel the pipe is made of ...A333-6, A106-B, & etc. I normally call out pipe this way:

4" PIPE, sch.40 SMLS, A105-B, PE

I call out for 4" diameter pipe, that is schedule 40 thickness (0.237&quot and it's seamless (SMLS) or ERW (elect. resistance welded) or DSAW (double submerged arc welded) and so on, next is the ASTM type of material ...in this case A53 grade B, and lastly ...the type of end on the pipe ...PE (plain end) BE (bevel end) TE (thread end)

Note here Mr. Zulu53 is correct, material and schedule are related when your looking at pressure/temp. ratings. I am only addressing the way to properly call out pipe in a bill of materials. Hope this helps, Good Luck! ...Mark