Fresh water pump noise

[Tristan]

How to lower noise from fresh water system? The pump ( a large one) is mounted on high quality rubber vibration absorbing legs. The next is a 4 gal pressure tank, filters, a manifold and PEX tubbing going all over the boat. When the pump goes on the whole boat is really shaking. The pump is not directly the main source of noise. I think, all the pipes are vibrating contributing to the total effect. How to deal with it - please help. I'm not a plumber.
T.

[perchance]

Check your pressure tank to see if it is water logged.

[sailorchic34]

Put rubber grommets between the pump and mounting screws/bolts. If bolts put rubber on the underside too. Use a section of flexible rubber hose between the pump outlet and pex.

Could always put some noise insulation like the stuff that's used on the inside walls of engine rooms/spaces. Make a box of it around the pump....

[Tristan]

The pump is mounted on flexible mounts - like an engine but smaller and more flexible.
The connection from the pump to the tank is a rubber hose. I will check the tank tomorrow. What initial air pressure should I set in the tank to if the pump is set for 40 psi ?
T.

[zeehag]

they make noise. they are not all quiet. mine is quiet and i wish it made more noise so i could hear when i leave it on.

[skipmac]

Originally Posted by zeehag

they make noise. they are not all quiet. mine is quiet and i wish it made more noise so i could hear when i leave it on.

So what brand/model quite pump do you have?

[zeehag]

jabsco shur flo...says quiet on it...i bought replacements that dont look exactly same--they dont say quiet. the quiet one has a clear part...my new ones dont.

[anjou]

My jabsco parmax is noisy but have noticed that if there is air in the system its even worse.
Just the way it is i guess

[senormechanico]

Try mounting the pump rubber mounts to a board which is soft rubber mounted to the boat.

[bstreep]

There are times that I wish our Jabsco unit was quieter, but I really like KNOWING when it cycles on.

[Tristan]

I do not think this is the pump mounting problem. I partially unbolted the pump and hold it in the air - it didn't get much better. I think, I've accidentally tuned the whole system to some kind of resonant between the pump and the pressure tank. It doesn't seems to vibrate after the tank . I'm planning to make a whole connection between the pump and the tank of soft rubber hose which would be much longer then the current pipe.
Strange !!

[sailorchic34]

tank pressure should be 15 ish PSIG or so...

[senormechanico]

Where is the accumulator tank located?
For best results, it should be located close to the pump, thereby absorbing the pulses as well as functioning as storage.
The farther away it is from the pump, the more hose you have transmitting the pump pulses to the hull.

[Tristan]

Originally Posted by senormechanico

Where is the accumulator tank located?
For best results, it should be located close to the pump, thereby absorbing the pulses as well as functioning as storage.
The farther away it is from the pump, the more hose you have transmitting the pump pulses to the hull.

There is around 24" of rubber hose and pvc pipe between the pump and the tank.
The pump is Groco Paragon with 600W motor

[DeepFrz]

Here is some information on pump/pressure tank installation. Notice the loop in the tubing between the pump and the pressure storage tank.

http://www.groco.net/SVC-MAN-07/Sec2/pdfs/PSR-DC.pdf