Pipe Schedule

[newbeehere]

Good day!
I have a question regarding the Pipe thickness table on ASME B36.10.
I receive a Pipe material today from our maincon.
A pipe 30", thickness 19.05MM. But i did not see any writing of schedule number.
when i look at the table of ASME B36.10, i saw that the thickness is there, but no indicated Schedule number (only ellipsis, or dot).

my question is, What is the schedule designate for this pipe 30", thick: 19.05MM , PLEASE SEE SNAPSHOT.

THANKS

ALEX

 

[LittleInch]

Basic answer - There isn't one.

More complete answer - Pipe schedule numbers are a historical device aimed at reducing the number of thicknesses all the mills needed to offer and in many ways making the same schedule equal the same design pressure (always check). Schedule numbers only really work up to 24" - As you can see, there are no schedule numbers higher than 30 for any pipes bigger than 24" OD. STD wall thickness is 9.53mm for ALL pipe sizes 12" and above.

For piping, some extra steel on a pipe is small beer and generally irrelevant to the cost of a piping project.

A pipeline on the other hand needs to minimize the wall thickness as much as possible as the material costs for the pipe normally comprise over 95% of the material costs so become very significant.

Hence wall thickness for line pipe needs to have many more steps in it than piping.

If you want more info see this or search for it online.

http://www.eng-tips.com/viewthread.cfm?qid=336095

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[newbeehere]

Thank you LittleInch for you very informative response.
Every thickness made by the mills to offer has a correspond designed pressure on the piping.

If There is no schedule marked on ASME B36.10, then,
I cannot assigned a schedule number of the 19.05MM Thickness of 30" Pipe.
I will just indicate on the Bill of materials the Thickness Number and not the schedule number?

Thanks

 

[LittleInch]

Design pressure for any size and wall thickness of pipe depends on things like design code, material strength, corrosion allowance, other stresses so no, each pipe thickness does not have a fixed design pressure.

Otherwise, yes, indicate on the BOM wall thickness if no schedule number exists.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.