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Just above water line thru hulls

Discussion in 'Technical Discussion' started by Capt Ralph, Aug 7, 2015.

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  1. Capt Ralph, Aug 11, 2015
    #21
    Capt Ralph

    Capt Ralph Senior Member

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    Smile when you type that.
  2. Caltexflanc, Aug 11, 2015
    #22
    Caltexflanc

    Caltexflanc Senior Member

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    H 22.7f:

    f. The discharge location shall be above the waterline created by maximum conditions of the boat's loading, heel, trim and motion astern. EXCEPTION: The discharge may be located below the waterline if the discharge line is provided with a vented loop to prevent siphoning into the boat. A check valve shall not be used for this purpose
  3. Capt Ralph, Aug 11, 2015
    #23
    Capt Ralph

    Capt Ralph Senior Member

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    H 22. refers to under 50 Vdc, bilge pumps.
    Except for comments of a loop higher than the water line if a list is involved, Comments of list angles affecting the loop height, a discharge Located below the water line has not been mentioned in this thread.
    The OP (me) refers to A/C and shower sump discharge hardware.
    Anti siphon on an A/C line would not be an issue anyway.

    Seems shower sump kits come with a built in check valve already.
    Just don't count on or use Crappy hose.
  4. Caltexflanc, Aug 12, 2015
    #24
    Caltexflanc

    Caltexflanc Senior Member

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    Re-read the definition of "waterline" in the rule above. That's the waterline that counts.

    Why would anti-siphon on an A/C line not be an issue? Because it flows back to the intake?
  5. Capt Ralph, Aug 12, 2015
    #25
    Capt Ralph

    Capt Ralph Senior Member

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    Yep.
    Hose failures not included in that comment, but failures can happen anywhere.
  6. Caltexflanc, Aug 12, 2015
    #26
    Caltexflanc

    Caltexflanc Senior Member

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    So given all the hoses, piping and connections associated with an AC system, it wouldn't make sense NOT to have an anti-siphon loops(s).. now would it?

    As for sumps, again, the little valves are there to prevent backwash of water remaining in the discharge hose into the sump when the pump turns off, not as a replacement for an anti siphon loop. Check out the instruction manuals.
  7. dennismc, Aug 12, 2015
    #27
    dennismc

    dennismc Senior Member

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  8. Capt J, Aug 12, 2015
    #28
    Capt J

    Capt J Senior Member

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    The a/c pump a lot of times doesn't produce enough pressure to open them. Or if it does they restrict flow, so you usually avoid them on an a/c pump.
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