Pipeline valve for higher pipe meterial yield strength
Pipeline valve for higher pipe meterial yield strength
(OP)
I have a problem for ball valve material selection for B31.8 pipeline.
Piping material use API 5L X70 ( SMYS=70 psi ), but valve material A105 with lower yield strength ( 36 psi).
Valve shall be full bore opening, but it seems not possible because the valve will be thicker (different ID) cause with lower strength.
1.Can the valve body manufactured with same pipe ID, wherefore OD enlarged.
2.What kind of common valve material should be used other than A105 to match the ID of pipe X70 ?
Piping material use API 5L X70 ( SMYS=70 psi ), but valve material A105 with lower yield strength ( 36 psi).
Valve shall be full bore opening, but it seems not possible because the valve will be thicker (different ID) cause with lower strength.
1.Can the valve body manufactured with same pipe ID, wherefore OD enlarged.
2.What kind of common valve material should be used other than A105 to match the ID of pipe X70 ?





RE: Pipeline valve for higher pipe meterial yield strength
We will design everything from now on using only S.I. units ... except for the pipe diameter. Unk. British engineer
RE: Pipeline valve for higher pipe meterial yield strength
You mean different ID (inner diameter) between valve and pipe still accepted, but is it any effect during pigging i.e pig may stuck around bottle-necking ?
RE: Pipeline valve for higher pipe meterial yield strength
Its good that you're thinking about how you will operate this pipeline. In the heaviest of wall thickness possibilities you might run into some problems with some kinds of pigs, so check with your pig supplier, if you have any doubts about that. It is usually not something you need to consider, unless you have wall thicknesses very much greater than the norm.
We will design everything from now on using only S.I. units ... except for the pipe diameter. Unk. British engineer
RE: Pipeline valve for higher pipe meterial yield strength
Pipe thickness = 12.7 mm w y.strength 65 psia
Valve A 105 yield strength 36 psia.
Valve thickness approx. ( 65/36 )x 12.7 = 23 mm
RE: Pipeline valve for higher pipe meterial yield strength
We will design everything from now on using only S.I. units ... except for the pipe diameter. Unk. British engineer
RE: Pipeline valve for higher pipe meterial yield strength
I think it's big idea to insert a transition-piece. Fortunately the line is not to be pig able, so it doesn't matter to make different id.
RE: Pipeline valve for higher pipe meterial yield strength
We will design everything from now on using only S.I. units ... except for the pipe diameter. Unk. British engineer