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Thread: Help me figure out if my pump is under performing.

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    amjohn's Avatar
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    Help me figure out if my pump is under performing.

    Doughboy PowerPak II marked as 1.5 hp- 12.4 Amp-115VAc-60Hz- 3450 RPM (no SF or BF on the label)
    Original gage was flakey, so we have now replaced it with a good quality Harvard gage that seems to be more dependable (so far).
    Just back washed the pool for the first time this summer (because we had 2 inches of excess rainwater to get rid of, seemed like a good time).
    The gage is now reading 13 psi- solar system is not on. Installed a blue white flow meter recently, that is currently reading 32 gpm. This seems low for a pump that is supposedly 1.5hp with a clean filter. What do you think?
    28 ft round Doughboy Sand Dollar II AGP, Aug 2008: 4 ft shallow, 6ft deep end: 24K gal approx Hayward Power-Flo Matrix
    1&1/2-HP 2-SPD Pump, Hayward 27-Inch Sand Filter with a little DE -(2) 4ftx20ft Solar Bear AGP Panels w/ Goldline auto-controller, 50ppm Borates And some day, maybe this year, a DECK!!!

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    Mod Squad Bama Rambler's Avatar
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    Re: Help me figure out if my pump is under performing.

    That does seem a bit low but we need a lot more info before we blame it on the pump. Here's a list that should help pinpoint a problem if there is one.

    1) What size piping is throughout the system and how much on the skimmer(s) line and return line(s).
    2) How many 90º ells are in the system and their size.
    3) How many valves are in the system and what size and are they full port.
    4) A list of all the equipment in the system.
    5) What size eyeball(s) are in the system.

    And any thing else you can think of.
    Pics of the system would be nice too.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    duraleigh's Avatar
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    Re: Help me figure out if my pump is under performing.

    Yeah, seems very low to me. That's probably about a full-rated 1hp pump and with that psi of 13 (perfectly normal) on the filter I would expect almost double that flow.

    mas985 is the champ on this stuff as are some others. I'm sure they'll be along to get more precise but I would think you be around 60gpm.

    Those flowmeters are picky about how they are installed. I'm sure you checked out the requirements for that but wanted to mention it, nevertheless.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    amjohn's Avatar
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    Re: Help me figure out if my pump is under performing.

    All pipes are 1.5inch dia, however, Doughboy requires reducers/adapters because their equipment comes in nonstandard size (about 1.25 inch I think). The first picture shows looking down on pump- water flows left from skimmer (inlet end) through first "L" to right through pump, then at skimmer and pump. There is 52 inches through curved flex pvc from the skimmer to the 90 degree "L" on the pump . The valves are marked 1.5 inch ball valves, but there is an adapter on each end of that - the skimmer and the pump have the strange Doughboy special pipe sizes on them. The pump to the filter is about 3 feet of flex pvc that Doughboy provided and required no adapters, so I am thinking it is that same 1.25 inch size.
    The second picture shows the return end with the adapter so that you can see how the reducer issue works. That is a 28 inch run down to a 90 degree "L" on the pump. The single return currently has a fountain adapter in it that is 1.5 inch OD, and the fountain adapter is a light PVC, so probably 1.25 ID. It is not currently in fountain mode, just flow through.
    The next picture is working back from the return- the 58 inch horizontal run on which the flowmeter is mounted. It appears to be mounted per the requirements- we got it from plsbcheap on this site, and he was very helpful in making sure we knew what to do. The issue is that my husband will then go and do his own thing, and I was not standing over him as he mounted it, but he claims he followed the instructions.
    The are 4 90 degree "L"s total and one 3-way valve in the system when the solar panels are turned off. The water flows through 1.5 inch flex pvc most of the time. The total water length flow on the return side is 29 feet with a 180 degree turn around right in the middle (where the water is bypassing the solar panels through the 3-way valve).
    Complete pictures are going to have to wait until I have my good laptop back, which is currently in the shop. I am borrowing a netbook with a 9" screen- not an image editing powerhouse. To get the blow-by-aggravating-blow account of our plumbing travails- see this post adding-solar-bear-panels-to-our-agp-the-process-with-pics-t11410.html
    The plumbing had to be redone several times, so realize that the first couple of configurations shown have been reworked. I think we are on Rev D.
    Attached Images Attached Images
    28 ft round Doughboy Sand Dollar II AGP, Aug 2008: 4 ft shallow, 6ft deep end: 24K gal approx Hayward Power-Flo Matrix
    1&1/2-HP 2-SPD Pump, Hayward 27-Inch Sand Filter with a little DE -(2) 4ftx20ft Solar Bear AGP Panels w/ Goldline auto-controller, 50ppm Borates And some day, maybe this year, a DECK!!!

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    amjohn's Avatar
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    Re: Help me figure out if my pump is under performing.

    For clarification, here is the run out to the solar panels and back through the 3-way valve, with the valve returning water without sending it through the panels.
    Attached Images Attached Images
    28 ft round Doughboy Sand Dollar II AGP, Aug 2008: 4 ft shallow, 6ft deep end: 24K gal approx Hayward Power-Flo Matrix
    1&1/2-HP 2-SPD Pump, Hayward 27-Inch Sand Filter with a little DE -(2) 4ftx20ft Solar Bear AGP Panels w/ Goldline auto-controller, 50ppm Borates And some day, maybe this year, a DECK!!!

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