High-Temp Pipe Economics
High-Temp Pipe Economics
(OP)
Does anybody have experience in A335 P2 vs. A335 P11 pipe as far as cost and availability? In a low-pressure (<200 psig) high-temp (1000F max) application, we have always used the P11 material (F11 flanges, forgings, etc). Is there any cost savings or availability issues with P2 material???
Tahnks,
\
Curtis
Tahnks,
\
Curtis





RE: High-Temp Pipe Economics
P11 has 1.25% Chrome,which resists erosion -corrosion damage and is useful in some applications where this is a problem. Also,some codes will not permit you to use a material if it can ever be overheated above the max tempfor which the code provides an allowable stress. For P11thatmay be 1100 F but for P2that may be 1000 F.
RE: High-Temp Pipe Economics
If you want to use P2, you will need to account for the reduced allowable stresses by increasing the thickness of the component, which adds weight. This could result in availability issues and increased cost in comparison to P11. Personally, I would stick with P11 material because you have increased design margin.