I'm just curious....spring has sprung and I'd like to get things updated. I
previously posted about having a 1/2 horse sewage pump with 2" outlet for my
I would like to install just the pump and leave the 1 1/4" hose there for
now...until I get the time to install the 2" outlet pipe.
would there be any harm in running the larger pump (with a 2" outlet) on the
smaller hose? obviously using a reducer and nipple will slow down the
overall flow....i'm more interested in whether I'll cause damage.
will the pump be working too hard trying to push water through a smaller
hose? will the hose (std 1.25" corrugated output hose) break under the
increased pressure? or am i OK? reason I want to upgrade is that I'm
getting a lot of junk down into the pit and the sewage pump passes it with
Sump pumps are centrifugal pumps. That means that the pressure rise across
the pump is a function of (pump speed)^2. Flow out of the pump is a
function of the system pressure drop. So, in your case, you will lose flow
out but will not harm the pump due to the restriction you're talking about.
You could actually dead end a centrifugal pump without doing damage,
however, having said that, in service, the downside of very low flow is that
the temperature rise across the pump can get high. Depending on how the
pump is designed, very low flow can impact the pump bearings.
As a bit more explanation: in a pump of this nature, the pump is using
the water for cooling. The idea being if flow stops, the water in the
housing just gets hotter and hotter because it can't dump the hot water,
and may damage the seals.
This will be quite rare. _Most_ impeller pumps actually run _cooler_
if the outlet is 100% plugged (because power consumption goes way down),
and there's still enough convection to conduct heat away from the seals.
It's more likely with submersible well pumps, where the whole unit
(motor plus pump) is relying on water flow for cooling.
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.
so if I read you correctly, you're saying the reduced flow caused by the
smaller outlet pipe will not be a harm
to the pump in MY situation. but in VERY low flow situations, it can be
harmful to pump bearings? as long
as I don't do damage to a new pump i'm happy...
any other thoughts on this 1.25" corrugated outlet pipe? I'm not gonna
burst that plastic stuff with a good sewage
pump, am i?
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.