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From: Arild Jensen (no email)
Date: Sun Feb 03 2008 - 22:18:22 EST
> -----Original Message-----
> I also don't understand why you'd want syphon breaks for bilge pumps on a
> trwaler. on a sail, boat, I can understand because of extreme
> healing but not on a power boat. the discharge should be hugh enough that
it
> can't get submerged... ex. 12" abouve water line with a riser loop.
ABYC does not allow check valves in bilge pump discharge lines.
ABYC also stipulates that the bilge pump discharge must be on a point above
the waterline when the vessel is heeled seven (7) degrees.
By comparison Lloyds and the European standards require a fourteen (14)
degree heeling angle. Lloyds do however allow check valves.
So why don't the builders put the outlets high up?
Designers don't like to see holes all over the hull.
It looks neater if all the water outlets are lined up in a row along the
boot stripe.
They look ugly, and the splashing noise of the water is annoying.
If the outlets are clustered or placed in line, the air conditioning
discharge is still the noisy culprit.
The list goes on. Bottom line, ABYC is a voluntary standard so if something
displeases the builder, they are not obligated to do it.
so to compensate for a low placement to appease the cosmetic requirements,
the builder installs a syphon break.
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