how to stop pipe vibration of water hammer above basement sewage pump?

Question

I had a sewage pit and a sewage pump in the basement.

The check valve is at the lower part of the 8- foot vertical pipe ( just above the sewage pump) and
this vertical pipe is 8 feet high,
and then go horizontally to the main outlet sanitary pipe.

Whenever the pump stops, there is a big bang and vibration in the piping system.
The big bang has been annoying day and night and the vibration is loosening/damaging fixtures and pipings.

One of the plumbers said the check valve (existing is vertical) should be installed as near as possible to the pump and it would be better at horizontal level.

Is there any other better way I can do and Do It Myself?

Thanks

this pipe is 2.5'' inches in diameter of PVC;
thus NO water hammer arrestor can be fixed into it?

thank you, TC
do you mean add another check valve above the existing one?
i.e. 2 check valves in series?

Answer 1

The only thing I can think of is adding a check valve 1/2 way up the pipe. This will stop the long drop for the water without adding any pressure against the pump.

Answer 2

You can create a home made hammer stop.

Refer to the following illustration. http://www.cottontailpool.com/images/hammerstop.gif

This could be added to the vertical stack (I have installed something like this on my water supply for our washer -- we had a problem with water hammer each time the solenoid valves shut off -- this solved it).

The blue area is the section that would typically have water in it. The grey area is trapped air that compresses slightly when the water flow stops. This is made of a T-section, an elbow, a cap and a section of short pipe.

Idealy, this would be right above the check valve if I understand your application correctly so that it absorbs the force of the full stack of fluid.

Hope this helps! Good luck!

Answer 3

you will possibly have air trapped on your pipes, yet that may no longer why they hammer. Having air on your pipes easily would help to chop back the hammering effect. you probable don't have sufficient stops. put in on your plumbing device. whilst a pipe is put in that's meant to have a "end" till now it is going to the valve. think of of your pipes interior the form of a T on it is component. The long area of the T is the water pipe coming in. The decrease area of the suitable of the T is going to the valve/faucet. the suitable area of the T is the tip that would desire to soak up the marvel of the strain being grew to become on and rancid. With CPVC stops are no longer constantly put in, the belief is that because of the fact the pipe is versatile the pipe will soak up the marvel, it would not constantly artwork as i think of you are able to attest to. the answer is to take a place in screw on stops accessible at your community ironmongery save. you install them the place you are able to, between the pipe and the versatile hose that connects to the faucet, lavatory, and/or washer. till now you go out and purchase them for the entire domicile, purchase one or 2 try them and notice if this solves your project. they could no longer be much low priced, yet greater low-value than having a plumber re plumb the entire device.

Answer 4

I've gotten good reports about this check valve; scroll down to the 'silent check':

http://www.aymcdonald.com/ProdList_Plumbing.cfm?PartNum=4420495&sendcat=13&getgroup=73