Impact testing criteria for vessel supports (skirts/saddles)
Impact testing criteria for vessel supports (skirts/saddles)
(OP)
Hello,
We are building a few ASME VIII-1 pressure vessels, some on skirts and some on saddles. As the skirts and saddles are non-pressure parts, they are not covered by ASME (aside from general guidance in appendix G and weldability requirements, etc...).
Is anyone aware of any codes that would relate to impact test requirements for such components in Canada (or US for comparison)?
Thank you,
Marty
We are building a few ASME VIII-1 pressure vessels, some on skirts and some on saddles. As the skirts and saddles are non-pressure parts, they are not covered by ASME (aside from general guidance in appendix G and weldability requirements, etc...).
Is anyone aware of any codes that would relate to impact test requirements for such components in Canada (or US for comparison)?
Thank you,
Marty





RE: Impact testing criteria for vessel supports (skirts/saddles)
RE: Impact testing criteria for vessel supports (skirts/saddles)
According to UCS-66 of ASME Section VIII-1 and paragraph 3.11 of ASME Section VIII-2, components and attachments that are "essential to the structural integrity of the vessel" must meet Code requirements for material toughness.
There was an interpretation on the old ASME Section VIII-2...
Paragraph 3.11 of the current ASME Section VIII-2 is similar to paragraph AM-204 of the old VIII-2.
ASME Section VIII, Div. 1 does not have a similar interpretation, but most owners in Alberta, Canada require that Div. 1 vessel supports meet the impact test requirements of the Code at -40°C or -40°F. I can't say if this is typical for the rest of the Owners in Canada. If there are no Client requirement, it's up to the vessel engineer's judgement.
RE: Impact testing criteria for vessel supports (skirts/saddles)
doct9960: Thank you very much for the in-depth response! That was very helpful.
I work in the ASME world, but this makes me wonder how structural engineers handle this. How would MDMT be handled for say a steel bridge in the far North of Canada? Is it handled through codes, or just purchase specifications?
Cheers,
Marty
RE: Impact testing criteria for vessel supports (skirts/saddles)
Fig.UG-66 shall be used for the requirement of impact test on structure parts of a pressure vessel. The structure parts may not be evaluated per Fig. UCS-66.1 for MDMT reduction as the parts come with different stress criteria for evaluation.
Bridge code and material spec have requirements on impact test.
An5
RE: Impact testing criteria for vessel supports (skirts/saddles)