I'm doing some work on my sump pump pipes.
First time in almost ten years.
I have a couple of questions concerning an air vent.
One reason why I'm doing this work is to stop the pipework from
banging when the sump pump stops and the water starts to flow back
down the pipes.
I may have acted too fast in doing some of the work but just want to
check here to see if might still be OK.
The check valve is located about two or three feet above the pump.
The pipe leaves the house at a height of about seven feet or so above
the check valve.
Is it OK to have the air vent about five feet above the check valve?
Is there an optimal height for the air vent to be located in relation
to the check valve?
On Wed, 9 Jul 2008 19:56:12 -0700 (PDT), "hr(bob) email@example.com"
Well, when I installed it this evening I was trying to kill two birds
with one stone.
I had a hole in the ABS piping with a small tube running into it (long
story). I wanted to cut out the hole section and at the same time
install this air vent.
I cut about three or four inches of pipe, enough to be replaced by the
pipe fitting and air vent. The air vent fitting is now standing
upright as I was told it should.
It is located approx. 5 feet above the check valve and I'm hoping that
this distance is OK.
This is approx. what it looks like, if this drawing comes through OK:
| | | |
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That's very odd. Which way does the water flow? This is the water leaving
the sump and exiting the house right? Wouldn't the water just flow right
out of the air vent? Whats the point of an air vent here?
My setup also does not have an air vent. But I did add a clean-out pipe to
it that should hold some air which should reduce the hammering a bit. Not
sure how well it works for that purpose.
__ exit house
\\ \\ | |
\\ \\ | |
\\ \\ | |
--- ---------------| |
Oh OK. Well there is no purpose of an air vent there. I suppose if you
don't have a vent at the topost point of the pipe, that vent could help
empty the pipe under certain circustances. To me its just a point in the
syste just waiting to fail and spill water all over your basement. I would
seal it off.
I've never seen one of these used in this fashion. As some others
have said, I too have had sump pumps with no air vent. However, I
have heard of them being used. The concept is that with some sump
pumps, if you have a check valve, during dry spells, the pipe between
the sump pump and check valve will drain and become filled with air.
When water returns and the pump goes to start, some may not prime and
pump because they are air locked by the air between the pump and the
check valve. To solve this, a small hole is drilled in the pipe to
allow air out. It's drilled in a location so that when water flows it
will stay in the sump hole. So, you have a small leak back into the
hole when the pump is running but it's acceptable.
That's the only venting issue I've ever heard of with sump pumps.
And I've had pumps that never had any air vent at all and worked
perfectly. I'd read the install manual for the pump you have and/or
website. And if there is any reason for a vent other than the above,
I'd like to hear it.
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