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Thread: 90' Elbows

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    90' Elbows

    Is there a formula to figure out the resistance difference of a 90 degree street elbow vs a sweeping elbow? Its my thought that a sweeping elbow will have less resistance and have a better water flow. The only sweeping elbows my HD carries are the DWV and Im guessing that I should not be using them for my lines.
    Thanks
    John
    24' AG, Jacuzzi CRF 750 Filter, Magnatek 1.5 HP 2 sp pump
    BBB Method

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    spishex's Avatar
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    Oct 2008
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    Re: 90' Elbows

    You're right about the DWV. Here are the equivalent pipe lengths.

    For 1.5":
    -Standard 90 = 4'
    -Street 90 = 6.7'
    -Sweeping 90 = 2.7'

    For 2":
    -Standard 90 = 5.5'
    -Street 90 = 8.6'
    -Sweep 90 = 4.3'

    Friction loss in ft. will depend on your water flow, but about 10% would give you a good idea. For example, 100' of 1.5" pipe adds 10' TDH at 40 GPM. So a standard 90 at 40 GPM will add .4' TDH.

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