Fire safe welded ball

Tuttoesaurito · Jun 3, 2019

Hi all,
I would like to ask you the following question. According to API 6FA, API 607, ISO 10497, could a welded closure valve be qualifed (as extension criteria) from a fire-safe certified bolted closure valve, assuming that internals are the same?

PeterIgg · Jun 4, 2019

IMO I would say: No. The valve is not the same basic design; I would consider the fact that the body shell is joined differently to disqualify based on this clause. In my experience, the way the body expands and contracts with heating and subsequent cooling affects the performance of the valve, I would expect the welded shell to be reduced in section compared to the bolted version and perform differently. That said, I would expect that once you have successfully achieved certification of the bolted version, the welded version should not be too much of a challenge.

gerhardl · Jun 4, 2019

Hi Tuttoesaurito and PeterIgg

I'm thinking along the same lines as PeterIgg here. There is also a question about the welding itself, if this could possibly have some influence on inner parts.

Tuttoesaurito · Jun 17, 2019

Thanks to both!

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Fire safe welded ball

Tuttoesaurito

Industrial

PeterIgg

Petroleum

gerhardl

Mechanical

Tuttoesaurito

Industrial

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