David:
If there is no anti-siphon loop in your bilge pump exit line, it is very
possible to have the water from the transom thru hull run back into the
bilge.
A fellow club member with a C&C 41 was doing an offshore voyage, when
around 2:00 a.m. with a following sea, he or one of the crew noticed the
bilge filling with sea water.....turns out there was no 'loop' in his
exit line .....he said it was a very scary situation until they
discovered the problem.
I removed the check valve from my electric bilge pump....I found the
smallest particles running through it caused it to not function
properly....maybe just an inferior valve, however, I don't miss it.
Rob Abbot
AZURA
C&C 32 - 84
Halifax, N.S.
On 2015-05-22 10:12 AM, David Knecht via CnC-List wrote:
We had a discussion a few years back about whether or not to have a
check valve on the bilge pump outlet hose and as a result, I removed
the valve from mine. All has been fine since. Yesterday, while
motoring for a long ways down the river, I noticed that the bilge was
filling with water. I pumped it out and the water immediately
returned. I pulled the pump out of the bilge, and water was pouring
into the bilge through the pump. When I lifted it, the flow stopped
so it seemed to be siphoning/flowing through the bilge pump exit line,
which is in the transom and when motoring, looks to be under water. I
have not checked yet to see if there is an anti-siphon loop. I am
guessing that this is one of the functions of the one way valve that
was there before, but I can’t figure out why it never happened before.
The Whale 500 pump does not specifically say it has a check valve,
but perhaps it does and it stopped working? I had an oil spill into
the bilge last winter and so maybe that is causing problems. I plan
to reinstall a check valve in the line so this does not happen again.
Any other thoughts? Thanks- Dave
Aries
1990 C&C 34+
New London, CT
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