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Doct9960, Sorry, me again. If the quoted sentence is for the jacket hydrotest pressure, why the code used "common elements" instead of "adjacent elements"? Regards,

Sorry, doct9960 you have a slower student. I thought "the common element" was the inner shell? Thanks again.

Sorry, after read again, but... Please help to understand "if the common elements of a combination unit...the hydrostatic test shall subject the common elecments to at least their design differential pressure, corrected...". Does the "their design differential pressure" not mean 232 + 14.7 =...

But this inner shell is subject to the external pressure caused by Jacket pressure. So the inner shell should be designed to the differential pressure. Then the hydrotest shall be the 1.3 times of differential pressure? UG-99(b) is for vessels designed for internal pressure? Please help me...

MAWP marked on the drawing is 0 for inner shell and 232 psig on the jacket. The client used FEA to verify that the inner shell is suitable for the differential pressure. I read UG-19 & UG-99(e), I can't interpret the inner shell should only be hydrotested to 25.2 psig per full vacuum 15...

Dear Doct9960, Now my client agreed that the inner shell is covered by the code. But instead of follwing UG-99(e) to perform a hydrotest to the inner shell, they want to follow UG-99(f) since the another cover, which is not covered by the jacket, is designed for full vacuum and will not hold...

Thank you

Thank you.

Thanks Welder4956, So even it could be compared to an ASME material?

doct9960, Interpretation of the code means this internal shell has the external pressure over 15psig, so can not be excepted from the code, right? Thank you.

doct9960, The jacket design pressure is 232 psig. My question is regarding hydrotest to the inner vessel, which will be in full vacuum. So what about full vacuum vessel, is that non-code one? Thanks.

All, Do we have to put P number when we prepare and qualify a WPS for an EN standard material to ASME IX? For example EN 10025 S235JR. Thanks.

Dear all, I also have questions regaridng a jacketed vessel. Do UG 99(e)(2) and or UG (f) apply to a jacketed vessel, which it has full vacuum (15 psig design pressure) for interior shell design? The jacket covers the whole interior vessel except one end - the flat cover. My customer...

Moody International Mr. Richard M. Essery Phone:(905) 569-9872 Cell: (905) 301-9656

Thank you, DVWE.

Thank you, metengr. I am going to continue "digging" the code. K

Metengr, Sorry, I do not understand, could you please explain more? Thank you. K

Dear all, Per ASME IX, "A WPS may require the support of more than one PQR, while alternatively, one PQR may support a number of WPSs." I could understand "a WPS may require more than one PQR" as due to thickness range. Could anyone provide samples of "one PQR may support a number of WPSs"...

Metengr, Thank you very much!

Thanks three of your input. So legitimately we can not use A511-504 for pressure vessels or tubes designed to ASME VIII, right? Thanks again.