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Hi bradh, This helps me a lot, Thans Shridhara.G.H

What is the material damping to be used for steel structures?

There is no pump there !!!! Pump is somewhere away very away....

Hi Muffin, Thanks for the reply, I have the test measured data.This is a problem faced in power system fuel line. The vibration definatly stops if the fuel is cut off. But I was curios to calculate the frequency,by some equations. Thanks Shridhara.G.H

Fuel is flowing in a piping system passes through bellows. Does this induces any vibrations in the bellows?.If Yes what will be the frequency of the excitation. The bellows upstream has a valve and down stream is a T joint.The flow velocity is just around sonic speed. Thanks