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-   -   Knocking pipes at end of pumping cycle (http://www.diychatroom.com/f7/knocking-pipes-end-pumping-cycle-78238/)

PLO 08-08-2010 06:51 PM

Knocking pipes at end of pumping cycle
 
Hi,
I recently changed my sump pump (the other one was more than 10 years old). The old pump was a vertical pump and the one I just installed is a submersible one. I'm experiencing some knocking or a kick back action at the end of the pumping cycle that did not happened before. The only change I made to the installation is replaced some flexible hose by PVC pipes for the discharge. I believe I have followed correctly the installation guidelines of the manufacturer. Any idea how to fix my problem ? Thanks in advance.

Pierre

LateralConcepts 08-08-2010 08:55 PM

Can you post a picture. We need more information. I'm assuming this is a sump pump for sewage in a basement? You may always have a little thump when the pump finishes discharging, but there's ways to minimize it.

Did you drill a hole in the discharge somewhere above the outlet on the pump?

Did you secure the pipe?

Did you install a check valve?

Did you install a gate valve?

PLO 08-11-2010 10:17 PM

Thanks for the reply...

You are corect this is a besment install.

The thump I get is more obvious than the one I use to get with the older pump. Can the flexible hose make the difference ? This pump is actually a little more powerfull than the old one 1/2 HP compared w/ 1/3 HP.

I did not drill a hole in the pipe. My understanding was that it was needed only if the check valve was mounted diretly on the pump... My check valve is located about 2 feet down stream. Do I need to drill a hole anyway and if so where should I drill it ?

I did install a check valve.

No gate valve.

The pipes are fixed and secured properly

Thnaks again.

LateralConcepts 08-11-2010 10:58 PM

Quote:

Originally Posted by PLO (Post 484375)
Thanks for the reply...

You are corect this is a besment install.

The thump I get is more obvious than the one I use to get with the older pump. Can the flexible hose make the difference ? This pump is actually a little more powerfull than the old one 1/2 HP compared w/ 1/3 HP.

I did not drill a hole in the pipe. My understanding was that it was needed only if the check valve was mounted diretly on the pump... My check valve is located about 2 feet down stream. Do I need to drill a hole anyway and if so where should I drill it ?

I did install a check valve.

No gate valve.

The pipes are fixed and secured properly

Thnaks again.

As far as flexible hose, that probably wasn't to code in the first place.

Yes, you still need to drill a hole (5/16" should be adequate) about 6" above the pump in the discharge. Just make sure it's below the water level (to avoid extra noise and splashing).

A gate valve would be a good addition to for servicing. A union or no-hub on the vent side is a good idea also. That way any time you have to pull the pump which sounds like you're going to do now, you don't have to cut the line and glue new couplings.


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