[Real Estate Sue]

Is a 1" diameter rubber hose/pipe adequate for a sump pump in an area of homes that never floods?

[hkstroud]

One and one quarter inches (1 1/4") is usual size of pipe for sump pumps. One inch will work but will reduce the GPM.

[speedball1]

Great answer Harold.

a sump pump in an area of homes that never floods

Now you got me curious. Why is there a sump in a area that's never flooded? Let me know, Tom

[Real Estate Sue]

Over zealous owner, I guess. So, it's the drain line. Inspector says it should be 3" or more to work adequately. What do you think?

[speedball1]

This link may help. Good luck, Tom Sump and Sewage Pumps ? Discharge Line Size | R.L. Deppmann Company

[hkstroud]

What line should be 3" or more, surely not discharge line?

What kind of inspector?

Tell us more.

[speedball1]

What kind of sump pimp did the inspector see that would make him think it needed a 3" discharge line? Must be one hellofa pump! Regards, Tom

[massplumber2008]

Yeah, sounds like nonsense to me, too!

Most sump pumps come with an 1.5" discharge tapping in the pump base...many reduce to 1.25", but not even a 2" discharge sewage ejector requires a 3" discharge line... ;)

Heck, never even knew a sump pump required a permit.

More info. please!

Mark

[Milo Dolezal]

To answer this question, you have to consider two things

1. Discharge hose MUST at least match size of discharge for the pump, but cannot be less...
2. Is the pump adequate ? Well, figure out rain fall in your area, see how much cfm your pumps is capable of pumping, add friction / resistance caused by distance / head / turns / type of pipe used for discharge + add 10 % - and that will tell you EXACTLY if your pump is adequate for intended use.

Milo

[speedball1]

Sump and Sewage Pumps – Discharge Line Size
By Norm Hall | April 26, 2010
Printer Friendly (PDF)
There are several considerations when selecting the discharge line size from a sump or sewage pump. The discharge line must be large enough to handle the EXPECTED SOLIDS. Sump pumps normally have very little solid content in the discharge. Residential sump pumps in general handle 3/8” solids. Small commercial sump pumps may be similar to residential, however, we normally use effluent pumps for commercial applications. These pumps handle solids up to ¾”.
Sewage pumps, and their discharge pipes, are selected to handle a maximum spherical solid. Residential pumps handle a minimum of 1-1/2” up to 3”. Any of us with small children would naturally opt for the larger sizes, based on what gets flushed down the toilet. Commercial applications demand the ability to handle 2-1/2” to 3” solids or more.
In general, the discharge line size is equal to or larger than the pump connection size. In sewage pumps, the discharge size should also be selected so the minimum velocity is 2 feet per second or more. This is referred to as the scouring velocity to avoid clogged pipes.

The liquid in the discharge pipe must be turned a minimum of once every pump cycle. This means the run time, at the selected gallons per minute (GPM) flow rate, should move enough total gallons of liquid to completely replace all of the liquid in the discharge pipe. If we oversize the pipe or have long runs, we may have to increase the flow rate to achieve the turn rate, as well as maintain the scouring velocity. Here is a chart to help you determine volume.


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Disclaimer: R. L. Deppmann and it’s affiliates can not be held liable for issues caused by use of the information on this page. While the information comes from many years of experience and can be a valuable tool, it may not take into account special circumstances in your system and we therefore can not take responsibility for actions that result from this information. Please feel free to contact us if you do have any questions.