They also have exhaust risers to keep water flowing out. Joel
On Fri, May 22, 2015 at 12:19 PM, Burt Stratton via CnC-List < [email protected]> wrote: > (Some) power boats use good scuppers. Their exhaust outlets are usually > very close to the water line. > > > > *From:* CnC-List [mailto:[email protected]] *On Behalf Of *Marek > Dziedzic via CnC-List > *Sent:* Friday, May 22, 2015 12:01 PM > *To:* [email protected] > *Cc:* Marek Dziedzic > *Subject:* Re: Stus-List Check valve on bilge pump > > > > If I were you , I would install an anti-siphon loop first and then think > of the check valve. > > > > Most of us don’t sail in really heavy weather conditions, so this may not > apply, but I read somewhere about an issue of flooding the engine with > water (hydrolock) by the following seas. The guy ended up installing a > manual cut-off valve on the exit of his exhaust to prevent it. I guess this > would make sense only if you are making long enough passages. > > > > Marek > > 1994 C270 “Legato” > > Ottawa > > > > *From:* David Knecht via CnC-List <[email protected]> > > *Sent:* Friday, May 22, 2015 9:12 AM > > *To:* CnC CnC discussion list <[email protected]> > > *Cc:* David Knecht <[email protected]> > > *Subject:* Stus-List Check valve on bilge pump > > > > 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 > > > > ------------------------------ > > _______________________________________________ > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > _______________________________________________ > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > -- Joel 301 541 8551
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