B31.3 Water hammer anlysis
B31.3 Water hammer anlysis
(OP)
Im doing a B31.3 analysis on a pipeline and I'm trying to calculate the maximum allowable water hammer within the pipe. I am taking a section [302.3.6 a] from B31.3 which says that the sum of sustained and occasional loads may be as much as 1.33 times the basic allowable.
So can I just take 1.33*basic allowable - sustained loads to find my maximum allowable water hammer (psi), then divide by cross sectional area to find max force?
So can I just take 1.33*basic allowable - sustained loads to find my maximum allowable water hammer (psi), then divide by cross sectional area to find max force?





RE: B31.3 Water hammer anlysis
RE: B31.3 Water hammer anlysis
RE: B31.3 Water hammer anlysis
We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky
RE: B31.3 Water hammer anlysis
We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky
RE: B31.3 Water hammer anlysis
RE: B31.3 Water hammer anlysis
1.) Internal Pressure Stress Limit of 302.3.5 (b)
which must meet the minimum wall thickness requirements of 304
specifically the minimum thickness equations found in 304.1.2 (3a) & (3b)
2.) Longitudinal Stress SL of 302.3.5 (c)
Sum of Longitudinal Stresses must not exceed Sh, the basic allowed material stress.
Since (at least for me) its more complicated to solve directly for Allowable hoop stress under internal pressure, subtracting it from those two plus equations there and then find the maximum allowed pressure, I prefer just to solve for hoop stress and longitudinal stress and simply compare those to their respective limits exactly as is done in the code.
We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky
RE: B31.3 Water hammer anlysis
RE: B31.3 Water hammer anlysis
The other matter you need to assess is the fatigue.
ASME B31.3 has quite a fe w conditions to meet in terms of unsustained loading, not least of which is getting the Owner's approval.
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His Holiness the Dalai Lama.
http://waterhammer.hopout.com.au/
RE: B31.3 Water hammer anlysis