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Shell vs dish ends thickness of a Pressure Vessel

Shell vs dish ends thickness of a Pressure Vessel

Shell vs dish ends thickness of a Pressure Vessel

(OP)
We are making a Pressure Vessel of the following specifications

Design Pressure : 3.5 barg
Design Temperature : 85 degC
Diameter (ID) : 900 mm
Length (T/T) : 2000 mm
Capacity : 1000 liters
MOC : SS316L
Head Type : 2:1 Ellipsoidal
Design Code : ASME Sec VIII Div1 Ed. 2010
Corrosion Allowance : 0.0 mm
Shell Thickness : 6 mm

We are forming the dish ends with 6mm sheet, so the final thickness after forming is around 5.3 mm.
So the shell thickness is 6mm, dish ends around 5.3 mm whch will be welded on both sides.

Will this be a deviation from the specifications, or is it negligible.


Please advise.

RE: Shell vs dish ends thickness of a Pressure Vessel

You are allowed a thin out on fabrication. If the calculated pressure is there it meets Code. it may not meet specified by the customer and that is between you and the customer.

RE: Shell vs dish ends thickness of a Pressure Vessel

Actually, you are not "allowed" a thin-out tolerance, but when you calculated the nominal thickness, you should have increased it to account for the thin-out.

RE: Shell vs dish ends thickness of a Pressure Vessel

Run the head at 5.3 mm, if it makes, OK, if not, not.

You need to know what "around" really means.

Regards,

Mike

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