Oxygen service
Oxygen service
(OP)
Does anyone have a feel for the use of AISI 4340 in high pressure oxygen? This is a pressure vessel rated for 30,000 psi at ambient.
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RE: Oxygen service
Also an airforce one, but I don't have addresses handy for either.
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Plymouth Tube
RE: Oxygen service
At 30,000 psi pressure this better be a code stamped pressure vessel. What are you going to do with 4340 alloy steel and this vessel? Is is being used for pressure boundary applications?
RE: Oxygen service
RE: Oxygen service
For high pressure oxygen bottles, at ambient temperature high strength low alloy steel pressure vessel plate is acceptable.
RE: Oxygen service
RE: Oxygen service
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Plymouth Tube
RE: Oxygen service
Out of curiosity, why does the ASME B&PV code not allow 4340 steel for any PV apps? Does the provision for "high strength low alloy steel" specifically identify ferritic microstructures, or are tempered martensitic microstructures also allowed?
RE: Oxygen service
RE: Oxygen service
For pressure vessel applications there are two uses; the first is pressure retaining function where the material is used under primary and secondary membrane stresses or as part of the pressure boundary (retaining). The second application deals with trim or non-pressure retaining function. It is under this application where any weldable grade of steel can be used.
Very simply, the reason 4340 steel is not specifically approved for use is because the carbon content exceeds 0.35% by mass. Material that is considered suitable for use must exhibit good weldability characteristics in addition to ease of fabrication and strength/ductility.
RE: Oxygen service
RE: Oxygen service
Further to TVP's question, what if you are making a cylindrical tank without welding and would like to use a high strength steel?
RE: Oxygen service
Regardless, you would need to use one of the Code approved materials listed in Table 1A in Section II, Part D of the ASME B&PV Code if this is for pressure retaining service.
RE: Oxygen service
RE: Oxygen service
RE: Oxygen service
RE: Oxygen service
Yes. It would require a Code Case for submittal. The Code gods may lend some pitty on an enterprising young man in the name of safety first, and not just for business needs.