Dear Experts,


We have 36" vertical pipe with 30 meters long and its fluid is sea water.
1- How can i calculate the fluid thrust(impact) on the bottom elbow of pipe?
2- How can i support this vertical pipe?(It should be mentioned that this pipe is near a pipe rack and is aboveground)

Regards,
M.Arian

1. The weight of the column of water will be supported at the bottom elbow but why should there be any impact there ? Is there a rapid change of state like filling from empty ?

2. Supporting a vertical line is astraightforward piece of pipe support design. Maybe use a trunnion (duckfoot) below the elbow or a ring stiffened collar (Blodgett type)in the vertical run.

Dear MoverZ,


Thanks for your replies but as you mentioned a rapid change occurs in the flow rate, then how i can calculate this force?
In the case of Steady State Flow , how i can calculate the force at the elbow?
I think i should support the pipe with a trunnion at above middle of the vertical run not with a trunnion bellow the elbow because those supported u mentioned can not carry the weight of pipe and water column. Is it true?

Regards,
M.Arian

Dear MoverZ,


Thanks for your replies but as you mentioned a rapid change occurs in the flow rate, then how i can calculate this force?
In the case of Steady State Flow , how i can calculate the force at the elbow?
I think i should support the pipe with a trunnion at above middle of the vertical run not with a trunnion bellow the elbow because those supported u mentioned can not carry the weight of pipe and water column. Is it true?

Regards,
M.Arian

You need to apply simple momentum equations based on change of velocity and thus mass flow with time, to establish what external force will be exerted with a change of flow rate.

There will be no external force on your support due to flow under steady state conditions.

If you want to support above the C of G, that's ok but you might think about a reinforced ring support rather than a horizontal trunnion.

DEAR SIRS,


COULD YOU RECOMMEND A BOOK OR A WEBSITE THAT ILLUSTRATES THIS FORMULAS?

TNX

Any decent fluid mechanics textbook would do.

Try this one, I like the direct no-nonsense approach: FLUID MECHANICS FOR ENGINEERING TECHNOLOGY by Irving Granet, published by Prentice Hall.

TNX MOVERZ

DO U KNOW ANY GOOD BOOKS FOR PIPING SUPPORTING?

There are many, some produced by spring manufacturers. Probably the most obvious in the context of this forum is "Pipe Support Design and Engineering" by Paul R Smith and Thomas J Van Laan (of Coade), published by Mc Graw Hill, ISBN 0-07-058931-3.

DEAR MOVERZ,


THANK U FOR UR USEFUL HELPS.

DEAR MOVERZ,


THANK U FOR UR USEFUL HELPS.