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Water hammer exists, there is a calculation that indicates it. In this case I have three forces water hammer, expansion and pressure thrust. My question is if there is a way to not transmit the forces of the water hammer to the pump nozzle? thanks to all of you

Littleinch Yes, the buried pipe can be considered an anchor the pump has displacements (possibly settlements) and vibrations, that's why we put the expansion joint. On the other hand we also have a reaction in the nozzle due to the expansion Thanks for you reply.

littleInch That's the problem: I have very low allowable for the nozzle pump.

Maybe this photo the real situation that will clarify the problem

hacksaw According to the photo, the pump appears to be on the left (unpainted). If that is the case, is the pump supplied with properly separated liquid feed. Could you explain what you mean?

A lot of questions: 1) What's the cause of the water hammer? A pump discharge shouldn't be hammering. Only time I've seen that is bad installs of medium consistency stock pump discharges, but your tag says Petroleum. DN 1400 pipe at 4.5 barg and 50ºC of water. The water hammer comes from the...

The problem is that I have low allowable values ​​for this pump. The ideal would be to put a fixed point where I indicate so that it absorbs the force of the water hammer, but it created very high stresses in the pump connection. It would be correct to use an expansion joint with a double...