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Old 03-11-2016, 10:48 AM   #21
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If all else fails, read the instructions

If you read the instructions first, fewer things are likely fail.

If it ain't broke, don't fix it

Too many people confuse "preventive maintenance" with "fix."
If you maintain it, it's a lot less likely to need fixing And the best thing about preventive maintenance is, you get to do it on YOUR terms, at YOUR convenience. Nothing ever needs fixing when it's convenient to do it.

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Old 03-11-2016, 12:06 PM   #22
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Instead of a syphon break on the engine, I have fitted a vented loop.

A vented loop IS a siphon break/anti-siphon device. And putting a vent line on it instead of an air valve is a very BAD idea! As you've noted, it's a very small hose...only 3/8" (which I suspect is the OD because the nipple on the top fits the ID of a 1/4" hose.), so the same sea water minerals and salt that you don't want to clean out of an air valve quickly clog up the connection. But because it's solved any squirting problem it becomes pretty much "out of sight, out mind"... turning your vented loop into an UNvented loop that no longer has any ability to break a siphon.
What they said ....
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Old 03-11-2016, 12:10 PM   #23
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In addition to the syphon breaks on my head. My engine is completely below the WL. Instead of a syphon break on the engine, I have fitted a vented loop. With the vent line (3/8") located on the topsides near the helm. This way it doubles as a seawater flow telltale and eliminates the possibility of the usual syphon valve sticking open or closed.
Same here, I check the telltale as I untie the boat when getting underway, and it is always visible from the pilothouse when running.
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Old 03-11-2016, 01:27 PM   #24
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I appreciate the discussion. Thank you. I was a bit ambiguous in noting my concern. Not so much the physics of a siphon (I actually taught university physics quite some time ago) but a concern over a manufacturer stating they "never saw a need"... there are implications to this that increase my prior level of (earned) pessimism around any decisions... design... diagnosis... operations... that emanate from the land-based side of the marine industry/services. My professional and academic lives force me to notice implications of decisions. Again.. appreciated.
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Old 03-11-2016, 03:17 PM   #25
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Same here, I check the telltale as I untie the boat when getting underway, and it is always visible from the pilothouse when running.
We're talking about two different applications: engines and toilets/sanitation systems. While both may need vented loops (siphon breaks, vacuum breakers...), my advice pertaining to plumbing them correctly applies only to toilets/sanitation systems.
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Old 03-11-2016, 04:50 PM   #26
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post #17???????
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Old 03-11-2016, 06:57 PM   #27
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post #17???????
Ooops...I failed to notice that we weren't talking about toilets any more. Mea culpa.
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Old 03-11-2016, 08:01 PM   #28
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Ooops...I failed to notice that we weren't talking about toilets any more. Mea culpa.
these TF threads are like minefields....
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Old 03-12-2016, 06:38 AM   #29
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"We're talking about two different applications: engines and toilets/sanitation systems. While both may need vented loops (siphon breaks, vacuum breakers...), my advice pertaining to plumbing them correctly applies only to toilets/sanitation systems."



However bilge pumps are frequently well below the WL and do require a vented loop if the discharge is near the water line.

A submerged bilge pump discharge is a perfect start to a siphon.
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