MW Pipe thickness definition
MW Pipe thickness definition
(OP)
Could someone help me? I'm a bit confused respect to this pipe spec I found:
PIPE SIZE / SCHEDULE OR THICHNESS: 219.1 / Sch.40MW
The question is: what means "MW" in this spec?
Thanks
PIPE SIZE / SCHEDULE OR THICHNESS: 219.1 / Sch.40MW
The question is: what means "MW" in this spec?
Thanks
Amaro O. Moraes
Rio de Janeiro - Brasil
aombr@yahoo.com





RE: MW Pipe thickness definition
I would guess that MW = minimum wall thickness.
A pipe spec should always indicate the weight/ft or /meter
to prevent any confusion as to scheduled or non-scheduled pipe walls.
http://virtualpipeline.spaces.msn.com
RE: MW Pipe thickness definition
Regards,
Amaro Moraes
Amaro O. Moraes
Rio de Janeiro - Brasil
aombr@yahoo.com
RE: MW Pipe thickness definition
I think the outside diameter is given in the original
post as 219.1mm.
regards
desertfox
RE: MW Pipe thickness definition
Then that would be referring to
8" Nominal D., 8.625" (219.1 mm)O.D. x Sch40 0.322" (8.18 mm) w.t. x 28.55 lbs/ft
http://virtualpipeline.spaces.msn.com
RE: MW Pipe thickness definition
RE: MW Pipe thickness definition
It seems BigInch is right. See for example, last column in table P-02B:
RE: MW Pipe thickness definition
http://virtualpipeline.spaces.msn.com
RE: MW Pipe thickness definition
I'm still a little fuzzy however as to exactly why the the issuer would include such an acronym along with Schedule 40 to mean "Minimum Wall" (particularly if that means the minimum thickness value number in the last column Mr. 25362 refers to) in a "pipe spec" (instead of e.g. just saying Schedule 40 or Heavier steel pipe, if that is what he really wanted)? I guess this is what I meant by possible confusion.
RE: MW Pipe thickness definition
Incidentally, the pipe schedule number was not originally based directly on the pipe wall thickness. It is supposed to be given by the relation: Sch.#≈1000*(P/S) where P is the service pressure and S is the allowable stress (see Piping handbook, 4th edition, 1945, p. 14.) Presumably, it simplified the design of pressure piping systems by using pipes of the same schedule number without needing to do a stress calculation for each size.
RE: MW Pipe thickness definition
http://virtualpipeline.spaces.msn.com
RE: MW Pipe thickness definition