Pipeline Surge Forces and Analysis 1

[cingold]

I'm hoping someone out there has some experience on this subject and can help guide me in the right direction.

I'm working on a stress analysis that involves a pipeline valve station during a surge event (after closing the valve at this station). I have pressure vs. time data at each elbow in the system as well as each side of the closing valve.

I understand analyzing the pressure wave's effects on elbow-elbow pairs, but where my knowledge is limited is at the effects of the closed valve.

For the first few minutes, we see the water hammer effects on both sides of the valve. But the pressure downstream of the valve continues to drop as the system pressure tries to balance itself with a reservoir downstream. This pressure drops eventually creates a pressure differential across the valve of 1100 psi. Multiplying this pressure by the pipe area creates very large forces at the valve.

I've spoken with many experienced engineers and heard various, contradictory opinions on whether I should include this force or not. So I was wondering if there’s any literature out there that covers these kinds of forces on a closed valve.

Should I turn on Bourdon Effect when running my analysis? If I include this pressure-force vs time table in the dynamic module, will I be double-dipping by having the Bourdon Effect turned on? Should I even include this force at all or is it a force that is internally balanced in the pipe?

Any help is greatly appreciated! If you need more information from me to give a good answer just let me know.

Thanks,
cingold