Screwed Connection
Screwed Connection
(OP)
Hi everybody
I need your response.
In my design spec. there is paragraph as bellow.
"Screwed connections are prohibited where threads provide the only seal of the pressure boundary."
I want to know why this requirement is applied.
And, this requirement shall be applied, is there any code/standard that this requirement is addressed.
Best regards,
I need your response.
In my design spec. there is paragraph as bellow.
"Screwed connections are prohibited where threads provide the only seal of the pressure boundary."
I want to know why this requirement is applied.
And, this requirement shall be applied, is there any code/standard that this requirement is addressed.
Best regards,





RE: Screwed Connection
RE: Screwed Connection
If you need an isolation valve, for example for a PT, the first valve may be welded or flanged, then your gauge valve, then then the PT.
Is this your contex?
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RE: Screwed Connection
It's applied because threaded fasteners tend not to retain the pressure boundary.
That depends on the type of application (service) and the country of installation.
Patricia Lougheed
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RE: Screwed Connection
Well, to quote ASME PCC-2 2006, Article 2.3: When the convenience of a threaded connection is desired, and the reliable seal of a welded connection is required, a seal welded threaded joint is sometimes used.
Seal welding is also addressed in ASME B31.3 and probably the other B31.x codes...
jt
RE: Screwed Connection
Ted