5k Pressure Vessel Bolting Issue 1

[MrGezus]

I am designing a 5k pressure vessel. The problem I have is that my flanges bolts do not meet. The reason I am using these flanges is because we manufacture API flanges for our core business. They do meet API requirements but not ASME. I can change the bolt sizing from 1.125 to 1.25 but that would cause a huge pain to deal with. I found a different bolt material (SA-574) which would allow me to keep my sizing. The problem with this is that the material spec shows it to be hex cap socket screws. Can I use that type of fastener? Can I have all thread studs made from this material? Any suggestions on a different bolt material or way of going about this that I do not see?

Operating Load
Required Bolt Load
Bolt Load at Hydro

I am using SA-193-B7 bolts
Holes: 8
Bolt Size: 1.125
Qty: 8
Threaded Root Area: .7277
Total Actual Bolt Area: 5.822
Flange Bore Dia.: 2.645
OD: 10.50
Flange Thk: 2.190
Hub: 2.160
Hub Major D: 5.250
Minor Hub D: 3.500
45k Mat
Hub Thk G0: .423
Hub Thk G1: 1.298
Stainless Gasket
P.D. 5.375
Temp: 250F
5k Working
7.5k Hydro

 

[MrGezus]

MrGezus, Fig UCS-66, General Note c) exempts SA-354 BD to +20 F only.

Ah. Thank you. I didnt see (C) For bolting and nuts... Appreciate your clarification.

 

[SnTMan]

MrGezus, you can learn a lot about the Code just by reading it