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sump pump flow rate question

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  • sump pump flow rate question

    1 hp Ridgid sump has 1.5" discharge. Pump runs 2 weeks/year. 2 yrs ago, it didn't keep up. Installed 2nd pump with 2" discharge. This year they did not keep up. 3rd pump seems crazy and I don't have space in sump. Engineer friend says that in industrial apps, the discharge from 1.5" pump is immediately opened up to 2" to increase flow rate and 2" discharge goes to 3" line. Does it increase flow rate significantly? Will these pumps still push water up 10' without problem? Any other issues/solutions?

    thanks

  • #2
    Re: sump pump flow rate question

    a 1hp pump on a 10' lift could be an overkill. sometimes the the pit is too small and causes the pump to cycle too much.

    please list you sump dimensions, depth and width, along with the total lift.

    what do you think is the water per hour coming in is?

    also post a photo and what do you have for a check valve? swing check or spring check. photos will help.

    there's a forum member/ mike, appleton drain that should be in your neighborhood if need be.

    rick.
    phoebe it is

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    • #3
      Re: sump pump flow rate question

      You need a good plumber to evaluate the requirements of your job.

      Good luck.

      J.C.

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      • #4
        Re: sump pump flow rate question

        Originally posted by painful View Post
        1 hp Ridgid sump has 1.5" discharge. Pump runs 2 weeks/year. 2 yrs ago, it didn't keep up. Installed 2nd pump with 2" discharge. This year they did not keep up. 3rd pump seems crazy and I don't have space in sump. Engineer friend says that in industrial apps, the discharge from 1.5" pump is immediately opened up to 2" to increase flow rate and 2" discharge goes to 3" line. Does it increase flow rate significantly? Will these pumps still push water up 10' without problem? Any other issues/solutions?

        thanks
        What is the size of your sump pit? If the water is coming in faster than the discharge rate of the pump you are not going to be able to control the problem. Increasing the pipe size does not increase the pumping capacity of a sump pump.

        Its best to have a sump pit of the right size that will take time to fill up to the proper turn on level, and a pump that can discharge the GPM you are experiencing.

        One of the mistakes people make is thinking a high horse power = more gpm, Higher horse power is really more for higher heads. But in some cases to get the gpm needed you may ended up with a much larger pump than you got.

        Now lets compare some pumps GPM the Ridgid SSP-1000 says it pumps 5400 GPH (90 gpm) @ 0' head I can not find the pump flow curve anywhere on the site, but we all know the higher the head the less water it pumps. If you want a pump that can pump them type of numbers at a 10 foot head them you would want to look at the Zoeller Model 161 it pumps 5580 GPH (93 gpm) @ 10' head.

        But you did say you had two pumps in there and they could not keep up so pump gpm does not sound to be the major issue. If you sump pit is undersized it will not give you the buffer you need. If the water is not discharging far enough away from the home and is cycling back into the drain tiles, it will overwhelm the system since you will be re-pumping the same water along with the water table.
        Ron Hasil Lic #058-160417
        A-Archer Sewer & Plumbing specializing in:
        Tankless Water Heaters | Drain and Sewer Cleaning
        Sump and Ejector Pumps | Backflow RPZ Testing

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        • #5
          Re: sump pump flow rate question

          If you can tell us total square footage of the basement, and if there is a detached garage with square footage, along with type of driveway(ie. gravel blacktop) and size. Also if the neighbors house is within 20' of your house or do you have a large lot?
          Ron Hasil Lic #058-160417
          A-Archer Sewer & Plumbing specializing in:
          Tankless Water Heaters | Drain and Sewer Cleaning
          Sump and Ejector Pumps | Backflow RPZ Testing

          Comment

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