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Pipe loads vs Diameter change

Pipe loads vs Diameter change

Pipe loads vs Diameter change

(OP)
Ever have someone get you so confused that you doubt the equations?? I'll post this in both Pump and Piping forums.

Situation ~ Horizontal discharge pump, 135psi (shut head) with 18" dia discharge connected to a 36" long transition spool piece that goes up to 24" diameter system. Static piping flange loads are all under manufacturers allowable limits.

Question ~ To determine the hydraulic loads applied to the flange, I took 135psi and the 18" diameter (assuming a shut head condition)which would apply 34353lbf reacting to 'pull' the pipe off the pump, resisted by the flange bolts.
The confusion lies in the effect of the 24" diameter. My comment(simply stated)was that the spool piece sides resisted forces other than the 18" diameter, but I was told the actual force would be 61000lbf from the 24" diameter pipe. A marker board full of sketches and equations (in metric)and a language barrier prompted me to write you guys for help.

Can anyone provide a brief, clear explanation on this?? Thanks!

Keep the wheels on the ground
Bob
showshine@aol.com

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