Hydrotest Allowable is 90 Percent of the Ambient Yield Stress

I hope the language in PVElite is not opaque as this attempted quotation.

If things are generally as unclear as this, their whole program sucks.

Dear ASD23789,

I have 2 queries with respect to ur question:

1- Please clarify whether ur question is with respect to ASME SEC VIII-1 or ASME SEC-1?

2- Please clarify the basis/reference for considering hydrotest allowable stress as 1.3 times the ambient allowable stress for the material.

As per clause UG-99(b) of ASME SEC VIII-1, hydrotest pressure is 1.3 times MAWP or design pressure (Note-34). Vessel adequacy should be checked considering allowable stresses during hydrotest as 90% of ambient yield stress.

Dear Mayank.Technip,

Thanks for your reply.

1) It is for ASME Section VIII Div:01.

2) Regarding your second question I am still confused. Please help.

Regards

ASD23789

Dear asd,

the first line of ur question is:

For ASME Division 1, the hydrotest allowable stress is 1.3 times the ambient allowable stress for the material.

Im asking you to pls clarify from where u picked up this information as it seems incorrect.Pls clarify the reference book/code clause no. etc for the same.

Pls note that hydrotest pressure is 1.3 times design pressure (note-34) or MAWP * lowest stress ratio of the equipment.