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API 620 Stiffener

API 620 Stiffener

API 620 Stiffener

40 years ago, a major tank company built a tank for my customer (I don't think the tank company is in business now).  They now want to replace it in kind.  The tank has a body cone with a compression stiffener.  The original construction shows the cone welded to the horizontal leg of the stiffener and the cylinder welded to the other side of the horizontal leg.

I have found no detail in API 620 that shows this detail.  In fact, details show the horizontal stiffener is weled to the exterior of the shell.

I know ASME UG-30 prohibits the cut in stiffener detail but does anyone know where this is addressed in API???

If we were to provide a cut in stiffener such as this, I will require a minimum of A516-70 plate with full UT exaimination of the horizontal leg of the stiffener to preclude laminar defects.

RE: API 620 Stiffener

The detail you describe is pretty typical for API-620 and 650 tanks.  I am not aware of anything in either API standard that suggests that the detail is not appropriate.

Steve Braune
Tank Industry Consultants

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