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Thread: questions on Pipe sizes and booster pump

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    questions on Pipe sizes and booster pump

    Hi all,

    I am re-plumbing my equipment before replastering my pool. Just want to make sure my pipes are adequate.

    My pool is about 24000 gallons. It has a combined spa and pool. The spa has 2" pipes on both return and supply. The pool has 2 skimmers which are connected to 1.5" pipes. The two 1.5" pipes then join to become a 2" pipe which goes to the pump. However, the pool return is only 1.5" while the spa return is 2". See the attached file.

    1. Does it improve the water flow if I convert the short section of 1.5" pool return to 2" before it branches out to 5 wall jets. All my pipes are exposed, so it is not hard to change.

    2. Most of booster pumps have 3/4" in/out pipes. Hayward has 1.5" in/out pipes. Since the pressure side of the booster pump will eventually connect to 1.5" pipe in the wall. Is it better to use a booster pump that uses 1.5" pipes all round instead of converting between 3/4" and 1.5"? I am wondering about water flow efficiency.

    Thanks,

    Scott
    Lazy-L shaped pool and a spa. 22.5k gallons. Pentair VS pump. Pentair cartridge filter CCP520. STA-Rite SR400NA heater (400K BTU). Leuder limestone coping. Pebble sheen (blue granite) Wooden deck.

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    mas985's Avatar
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    Re: questions on Pipe sizes and booster pump

    1. Exactly how much pipe are we talking about? Is the the pipe underground or the small section (2') of pipe that connects to the valve? The improvement is proportional to the amount of pipe so a 2' section of pipe is usually not worth the effort. But if it the pipe that goes from the pad to the pool, then it is worth the effort.

    2. It probably won't make that much difference either way. Just go with what is more convenient. If you are concerned about efficiency, dump the booster and go with a cleaner that doesn't require one.

    BTW, the biggest impact you can do to improve efficiency is to run at a lower pump speed so are you planning for a VS or two speed pump?

    Also, how many jets do you have in the spa? 2" is really too small for almost any spa.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: questions on Pipe sizes and booster pump

    1. See the pipe attachment. I am thinking to replace the 4' section. Maybe 25', 12', and 20' as well. Just wonder if it is worth the effort...

    I have about 6-8 jets in the spa.
    Lazy-L shaped pool and a spa. 22.5k gallons. Pentair VS pump. Pentair cartridge filter CCP520. STA-Rite SR400NA heater (400K BTU). Leuder limestone coping. Pebble sheen (blue granite) Wooden deck.

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    Mod Squad jblizzle's Avatar
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    Re: questions on Pipe sizes and booster pump

    I think to get any benefit for the pool returns, you would have to replace a majority of the pipe (not just the 4'). Do you get much flow out of Jet 5? It would be better if you completed the loop between Jet 1 and 5 as well.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: questions on Pipe sizes and booster pump

    One thing I want to point out, the two skimmers use 1.5" pipes around the pool until they merge to a 2" pipe at the pad. Since the skimmers pipes are mostly 1.5", I wonder if upgrading the pool return lines would give any benefits...
    Lazy-L shaped pool and a spa. 22.5k gallons. Pentair VS pump. Pentair cartridge filter CCP520. STA-Rite SR400NA heater (400K BTU). Leuder limestone coping. Pebble sheen (blue granite) Wooden deck.

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    Mod Squad jblizzle's Avatar
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    Re: questions on Pipe sizes and booster pump

    Think of it this way: you are sucking half the water through each of two 1.5" pipes from the skimmers ... and then forcing ALL the water through ONE 1.5" pipe.

    I think you would find better flow through all your returns if you could ideally complete the loop and use 2" pipe for the loop. At a lower end: complete the loop with 1.5" pipe and use 2" up to the point it splits.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    mas985's Avatar
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    Re: questions on Pipe sizes and booster pump

    A spa with 6-8 jets cannot really perform well with just 2" pipe. If there is any pipe to be replaced, that is the one I would target and use 2.5".
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: questions on Pipe sizes and booster pump

    The pump, filter, and heater all use 2" pipes. I don't see how upgrading the spa return (the middle bottom part in the first diagram) to 2.5" would improve the spa jets' flow...
    Lazy-L shaped pool and a spa. 22.5k gallons. Pentair VS pump. Pentair cartridge filter CCP520. STA-Rite SR400NA heater (400K BTU). Leuder limestone coping. Pebble sheen (blue granite) Wooden deck.

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    Mod Squad jblizzle's Avatar
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    Re: questions on Pipe sizes and booster pump

    Because it lowers head loss and increases flow rate. It is not solely based on the "bottleneck" of the 2" at the pad.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    mas985's Avatar
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    Re: questions on Pipe sizes and booster pump

    Although it wouldn't hurt to change the pad plumbing to 2.5" either even though it will have less of an impact. Were your spa jets working properly and were they strong?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: questions on Pipe sizes and booster pump

    The pool has been empty since we bought the house almost 3 years ago. So I don't know how well the circulation was. The equipment was working then. Not sure if they still work now...
    Lazy-L shaped pool and a spa. 22.5k gallons. Pentair VS pump. Pentair cartridge filter CCP520. STA-Rite SR400NA heater (400K BTU). Leuder limestone coping. Pebble sheen (blue granite) Wooden deck.

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    mas985's Avatar
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    Re: questions on Pipe sizes and booster pump

    My guess is that with that plumbing, the spa jets are going to be pretty weak.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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