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Cold Stretching vs Hydrostatic Test

Cold Stretching vs Hydrostatic Test

Cold Stretching vs Hydrostatic Test


When performing cold stretching on austenitic steels to improve my allowable stresses in cryogenic aplications. Do I still need to perform an hydrostatic test?

Also, can someone with knowledge on cold stretching check which one of the below is correct, procedure 1,2 or 3.

Procedure 1:
1- Design and fabricate using allowable stress AFTER cold stretching
2- Perform cold stretching
3- MAWP is set based on thickness and allowable calculated on 1, and not on the actual final thickness.

Procedure 2:
1,2 - same as above
3- Check thinning on thickness
4- Recalculate MAWP based on the final thickness

RE: Cold Stretching vs Hydrostatic Test

Under what code of construction?

Sec 8 Div 1 MA 44 answers your questions as directly as a design code can... if that code applies.

RE: Cold Stretching vs Hydrostatic Test

I have purchased cryogenic dual-wall bullet with cold stretching years ago from an Australian company. They are expert in this area that will be able to answer your questions. I am not sure if it is ok to give company name and contact in this forum.

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