Will water hammer pressure wave have impact on every elbow pair irrespective of the distance between the elbows.
OR
Elbows pairs with less distance between them will not experience any force.
As i am analysing a system with several loops , do i need to consider force on every elbow pair or i can leave some elbows with smaller spools, say 3 m.

Mr. Kausik,

Are you analysis through Static Equivalent Approach or Dynamic Approach.

I am analysis through dynamic approach, using the water hammer module in dynamic analysis.I am exactly following the steps given in Caesar tutorial.

Yes water hammer pressure wave hav a impact (load) on every elbows !
The level of the force is contigent on distance between 2 elbows.
The load time T = L/c.
L is length between the 2 elbows
c is speed of sound
The load rise time t is the valve/pump close or open time
Is t unknow you can conservativ take t = r/c
r is inside radius pipe

The relationship T/t is now important for the load between 2 elbows.
If T>t then the force (Joukowski) is full effective.
If Tby the factor T/t.

Dear Mr.Ohliger,

If it so, How would we consider for the speed of the sound.Also,if T
Is it right to consider the forces on Elbows wherever longer pipelines are
projected..

Thanks for sharing...

Mr Ohliger,
Thanks for your help. I am considering the force on each elbow pair to be on safer side, although it is bit conservative.As the whole event is occurs at the speed of sound so time history is better approach to know the piping response.As the spool length between two elbows decreases the so does the impulse on the spool.
Impulse= Area under force time curve of time history





Mr. Satpiping,
I am not able to get your question