Pearson Boats - Common Systems > Plumbing and Galley Systems

Bilge outlet routing

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selene:
Appreciate the feedback, Ed; I'll give it further thought. I read on another site:
"Even if the outlet is normally above the waterline, water may siphon into a heeled or well-laden boat, as mentioned previously. It may he driven up by following seas; or, in an otherwise calm anchorage, be forced up the pipe by repeated wakes from passing boats or water-skiers. This phenomenon is known as water hammer. I heard of an interesting case of this recently in which waves, deflected off a seawall, repeatedly hit the stern of a boat, eventually sinking it."

Of course this is not a problem with the valves in the Whale Gusher; probably not with the Rule routed out on the transom, either....just wondering what other folk do!

Dolce_Vita:

--- Quote from: selene on December 31, 2011, 01:21:25 AM ---I read on another site:
"Even if the outlet is normally above the waterline, water may siphon into a heeled or well-laden boat, as mentioned previously.
--- End quote ---

True, but that's why mine is on the stern, and high enough that it never goes under.

 
--- Quote from: selene on December 31, 2011, 01:21:25 AM ---It may he driven up by following seas; or, in an otherwise calm anchorage, be forced up the pipe by repeated wakes from passing boats or water-skiers. This phenomenon is known as water hammer."
--- End quote ---

Quite true, but an anti-siphon valve won't help with this.  Anti-siphon valves break open under suction, to stop the siphon.  They close under 0 or positive pressure.

The check valves in the whale gusher would prevent this, but the bilge pump lacks any kind of valve, and would benifit from a check valve.

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