I don't really know if most of [b]the banging comes through the mounting or the hoses or is transmitted through the water pulsations.
Per: Is "water hammer" a different phenomenom than "pump" noise?
I was considering adding an accumulator tank, and read the following from the ShurFlo website:
The accumulator contributes to longer pump life, less noise, less amperage draw, and reduced water pulsation. The most efficient use of the accumulator occurs with the pre-charge set at the SAME pressure as the pump’s pressure switch “turn on” setting. Typically, a 40 psi [2.7 bar] pump will turn on at 20 psi [1.4 bar]. Therefore, the pre-charge should also be 20 psi [1.4 bar]. The pre-charge MUST be set in a “static” condition (pump off and at least one water fixture opened).
Approximately 15% of the total volume will be stored liquid. Depending on pre-charge pressure to the accumulator, in relation to the pump turn on/off pressures, stored liquid is about 2 to 4 oz. [60-120 ml]. If accumulator tank pre-charge exceeds pump turn on pressure, the liquid volume is reduced.
[b]WATER HAMMER APPLICATIONS
When used as a dampening device/water hammer or noise suppressor, the pre-charge should be set at the operating (dynamic) pressure. Place a gauge in the offending plumbing where the accumulator can be mounted. Adjust the valve so the noise is generated and read the pressure. Set the pre-charge to the observed pressure, remove the gauge, and install the accumulator.
My "Jake Brake" sound seems to be the mechanical sound of the pumping piston action. "Water Hammer" is a sound I associate with my grandfather's steam radiators.