Guys,
API 17D (Design and Operation of Subsea Production Systems - Subsea Wellhead and Tree Equipment) has included in its second edition a requirement for flange make-up with bolts at 70% yield stress with an allowance of ±3% (see below).
“Closure bolting of all 6BX and 17SS flanges shall be...
Guys,
Is there anybody knows where to find material properties data to perform shakedown and ratcheting analysis for Inconel 625, 718 and 725 and Incoloy 825?
I thank you for helping,
HotStab.
Guys,
Is there any specific operational procedure that is suitable to avoid hydrate formation in valve cavities when changing from water injection to gas injection in subsea production equipment?
I would appreciate any guidance on this matter.
HotStab.
Guys,
For the second time I have faced problems with large buttress threads. In the first event the thread was more than 25”ND and the parts to be connected were heavy (more than 10 kips). Nevertheless, the recent galling problem involved a bigger thread pair (28” ND) but lighter pieces (1200...
Please, help me to understand the extension that a hydrostatic test shall be applied in equipment that has mechanical connections indirectly collaborating with pressure resistance.
As far as I know, the flange bolting submitted to hydrostatic pressure tests does not need be the same to be...
I would appreciate a help to clarify a basic issue.
I work for a multinational company, with many sites all around the world, manufacturing the same product portfolio. The engineering and manufacture documents are in a global system, which is accessible for anyone inside the company on-line...
I am working on the design of subsea pipeline equipment: PLETs and In-line ESDV Sleds. PLETs shall be connected to rigid pipes, but In-Lines shall be between flexible flowlines. They shall be installed at depth up to 2000 meters.
Due to lay-out configuration, for all assemblies the center of...
Hi everybody,
The gland fill factor for O’ring seals is normally recommended from 60 to 85%.
Elastomer thermal expansion and swell are known reasons for restrictions of maximum fill. In other words, these issues impose minimum groove dimensions for a given O’ring section.
But, what about the...
API 6A (Spec for Wellhead and Christmas Tree) requires for PSL3 equipment UT inspection for CRA overlay. For overlay applied in ring grooves there is no volumetric inspection prescribed, not even for bond integrity evaluation. Its seams strange because, in my opinion, in the majority of cases...
