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Wow, thanks for all these great replies. I guess I better hit the books now.

If you're using B31.3 piping code see the section about Stress Range Reduction Factor. If you're only cycling once a day and designing a for 20 yr plant life that's only 7300 cycles. Assuming that stresses are low, I feel it's not worth evaluating for fatigue since there will be some shut-down...

Usually 6" support on 12" is good; however, there is not enough info. to determine whether you have problem elsewhere. Also many pipe stress engineers refer dummy or trunnion as horizontal extension. Most would call your support as a "base support".

Thanks for the detailed info. cockroach; however, I was looking more in terms of how supersonic overpressure by blast wave and dynamic pressure (blast wind) affect our piping systems. The explosion analysis such as gas expansion and atmopheric compressions have been performed by third party...

If you've used CFD programs, then it's over for me b/c I do not have access to such expensive program (and even if I did, it would take me months to learn it). My nick name is jone1939, and I have an account with yahoo. So if you could describe the general approach, that would be helpful for...

Has anyone performed blast analysis on piping systems? I have a question about converting blast wind pressure to velocity and to equivalent force. Thanks.

I guess the greatest mystery of all is how B16.5 came about with the equation to set the maximum allowed pressure rating. B16.5 doesn't even include geometry. Mathematical model shown in ASME sec. VIII (shell theory) incorporates geometry/gasket values and generated different pressure stresses...

Sure, NP. Flange Face: RF Gasket Type: 347SS B16.5 Spiral Wound Bolt Matl: ASTM A453-660 Exceeding Stress: Radial Flange Stress=21700 psi Allowable Stress = 20000 psi External F/M= zero Internal Pressure = 2910 psig B16.5 Table shows F347 to be good up to 3020 psig @ 325°F. Please let me...

Mogens, I have reviewed the Annex D of ASME B16.5 for explanation, but it still does not show how the pressure rating tables were generated in terms of mathematical equations (like ASME Sec VIII flange analysis). I have somewhat of reverse problem to the Tankman. Our project is using 2&quot...