Wall thickness Calc. for a 30" Paddle Blind
Wall thickness Calc. for a 30" Paddle Blind
(OP)
I require a 30" Paddle Blind to be used on a Produced Emulsion Line between a 30" RFWN flange and a 30" Gate Valve with RF ends.
Line Info: (Operating Pres. = 1500 kPag, Operating Temp. = 183 deg C ; Design Press. = 4000 kPag, Design Temp. = 220 deg C ; Test Press. = 5000 kPag - Water)
A vendor has sent me a drawing but I wish to verify the proposed wall thickness.
Paddle Blind Info: (Material = SA516-70N ; Diameter = 37.38" ; Blank thickness = 2.380")
I am currently looking at ASME 31.3 Eq'n 15 paragraph 304.5.3 but am unsure of what values to use for some of the variables in the equation.
Equation Info I am using:
c = 0.5 mm ?
dg = ?
P = 4000 kPag
S = Yield Strength from Table A-1? (i.e. 23.1 ksi)
W = ?
E = ?
Can anyone comment on where I should look to find the missing information? I am an E.I.T. new to the oil and gas industry and I do not have much experience with this formula so please excuse me if I have overlooked something obvious.
Thanks in advance for the advice.
Line Info: (Operating Pres. = 1500 kPag, Operating Temp. = 183 deg C ; Design Press. = 4000 kPag, Design Temp. = 220 deg C ; Test Press. = 5000 kPag - Water)
A vendor has sent me a drawing but I wish to verify the proposed wall thickness.
Paddle Blind Info: (Material = SA516-70N ; Diameter = 37.38" ; Blank thickness = 2.380")
I am currently looking at ASME 31.3 Eq'n 15 paragraph 304.5.3 but am unsure of what values to use for some of the variables in the equation.
Equation Info I am using:
c = 0.5 mm ?
dg = ?
P = 4000 kPag
S = Yield Strength from Table A-1? (i.e. 23.1 ksi)
W = ?
E = ?
Can anyone comment on where I should look to find the missing information? I am an E.I.T. new to the oil and gas industry and I do not have much experience with this formula so please excuse me if I have overlooked something obvious.
Thanks in advance for the advice.





RE: Wall thickness Calc. for a 30" Paddle Blind
If you have access to B16.48, you should look it up and try to run the calc's for a 24" diameter and see if you match up. That'll give you some confidence that you are running the numbers correctly.
http:/
You can find the gasket inside diameter in B16.20 h
The blind should be cut from a single plate with no welds. Thus, E=1 and W=1.
Keep in mind that the analysis behind the formula is linear and rather conservative. Some guy in Canada ran some numbers to show just how conservative: http://sto
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RE: Wall thickness Calc. for a 30" Paddle Blind
RE: Wall thickness Calc. for a 30" Paddle Blind