Designing a Blind
Designing a Blind
(OP)
Hi,
I was hoping I could get some help. I was verifying the design of a blind for RTJ flange that a contractor proposed to us using B31.3 calculations. The material they're proposing to use is 44W steel. I don't see 44W in Table A-1 to get the S value. I know the yield strength is 44ksi from other structural books I'm using, but wasn't sure if I was allowed to substitute the value from there or if Table A-1 using more conservative values for the same material.
Similarily, please correct me if I'm wrong, the E value even though it's not shown there would just be 1.0 as it's a plate (therefore seamless) and the W value would also be 1.0.
thank you.
I was hoping I could get some help. I was verifying the design of a blind for RTJ flange that a contractor proposed to us using B31.3 calculations. The material they're proposing to use is 44W steel. I don't see 44W in Table A-1 to get the S value. I know the yield strength is 44ksi from other structural books I'm using, but wasn't sure if I was allowed to substitute the value from there or if Table A-1 using more conservative values for the same material.
Similarily, please correct me if I'm wrong, the E value even though it's not shown there would just be 1.0 as it's a plate (therefore seamless) and the W value would also be 1.0.
thank you.





RE: Designing a Blind
The stress value S in table A-1 is NOT the yield stress, but something considerably less than that. If you look at the table you will see a column showing yield strength and then the values for S. You will see a considerable difference.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Designing a Blind
It's a 16" 2500# RTJ Pancake Blind.
B16.48 only goes to 12", I believe for that chart.
thanks.
RE: Designing a Blind
A simple search found examples like this which seems to offer #2500 flanges to 24" http://www.redearthsteels.com/flange-type-flanges-...
I would trust a blind from someone like this rather than a contractor, especially if he's using material which isn't listed.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Designing a Blind
It was also pointed out to me that ASME Section II-D has the required S value for this plate.
RE: Designing a Blind
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Designing a Blind