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02-03-2020, 08:13
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#1
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Registered User
Join Date: Apr 2019
Boat: Jupiter 40 built by Klaus Baess 1968
Posts: 79
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Tell me why this is a bad idea
I have 2 sink that are now below the waterline, I have 2 spare pumps and wondered if this method was sound?
Thanks
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02-03-2020, 08:21
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#2
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Registered User
Join Date: Feb 2018
Posts: 1,126
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Re: Tell me why this is a bad idea
Quote:
Originally Posted by JimMann
I have 2 sink that are now below the waterline, I have 2 spare pumps and wondered if this method was sound?
Thanks
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Consider the pros/cons of a sump box (like a shower sump) as well as a one-way valve.
But what is the current arrangement more precisely? What are you trying to accomplish with what kind of usage?
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02-03-2020, 08:28
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#3
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Registered User
Join Date: Apr 2019
Boat: Jupiter 40 built by Klaus Baess 1968
Posts: 79
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Re: Tell me why this is a bad idea
Quote:
Originally Posted by Singularity
Consider the pros/cons of a sump box (like a shower sump) as well as a one-way valve.
But what is the current arrangement more precisely? What are you trying to accomplish with what kind of usage?
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I just want the sink to drain automatically since it’s under the waterline
Thanks
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02-03-2020, 08:40
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#4
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Registered User
Join Date: Nov 2015
Location: Somewhere in the Pacific Ocean
Boat: Catalina Morgan 45
Posts: 596
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Re: Tell me why this is a bad idea
A sink below the waterline???
It's not going to drain "automatically." Essentially you are draining into a very small sump, and using a pump to exhaust the water.
Essentially, your arrangement could work, but be sure to put in a vented loop well above the waterline between your pump and your outlet. I would also be sure to put a strainer/filter before the pump so any foreign objects put down the drain besides water are trapped and don't clog the pump. (If this is the route you go...perhaps consider draining into a Rule 98B shower sump.)
Practically speaking this all seems a bit strange, and pretty risky IMHO. Pump failure, float switch failure, clogged filter, etc. Seems like you're introducing problems.
Just out of curiosity...how do you get 2 sinks below the waterline in a Spray 36? (Which is a beautiful boat!)
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02-03-2020, 08:47
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#5
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Registered User
Join Date: Mar 2013
Location: San Diego
Boat: Jeanneau 349, FP 47, Sense 50, J 42ds
Posts: 752
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Re: Tell me why this is a bad idea
Make sure you have a vented loop. If the outlet ends up below the waterline as the boat heals you will start a siphon back into the boat.
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02-03-2020, 10:44
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#6
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Registered User
Join Date: Apr 2019
Boat: Jupiter 40 built by Klaus Baess 1968
Posts: 79
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Re: Tell me why this is a bad idea
Quote:
Originally Posted by Discovery 15797
A sink below the waterline???
It's not going to drain "automatically." Essentially you are draining into a very small sump, and using a pump to exhaust the water.
Essentially, your arrangement could work, but be sure to put in a vented loop well above the waterline between your pump and your outlet. I would also be sure to put a strainer/filter before the pump so any foreign objects put down the drain besides water are trapped and don't clog the pump. (If this is the route you go...perhaps consider draining into a Rule 98B shower sump.)
Practically speaking this all seems a bit strange, and pretty risky IMHO. Pump failure, float switch failure, clogged filter, etc. Seems like you're introducing problems.
Just out of curiosity...how do you get 2 sinks below the waterline in a Spray 36? (Which is a beautiful boat!)
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Hi,
The bathroom sink I could prob get away with as it’s borderline but the previous owner had the shower drain going into the bilge and the sink he had was very shallow but raised quite high, new sink is much deeper hence the issue. I thought I’d just run them both into an automatic pump.
I remade the kitchen in the mid of the boat due to it being too small in the pilothouse. Its very practical now and i refitted the pilothouse as our main living area but my sink was a little deeper than expected thus me being just below the line (I’m using the existing drainage holes) I was planning to put in a filter of some sort, the sink also has its own one built in as well.
I’ve seen basement system like this, just trying save money And use what I have
Thanks
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02-03-2020, 10:52
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#7
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Registered User
Join Date: Apr 2019
Boat: Jupiter 40 built by Klaus Baess 1968
Posts: 79
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Re: Tell me why this is a bad idea
Quote:
Originally Posted by Zzmeyer
Make sure you have a vented loop. If the outlet ends up below the waterline as the boat heals you will start a siphon back into the boat.
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Ah yes, thanks for that!
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02-03-2020, 10:57
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#8
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Registered User
Join Date: Mar 2013
Location: San Diego
Boat: Jeanneau 349, FP 47, Sense 50, J 42ds
Posts: 752
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Re: Tell me why this is a bad idea
By the way, your idea is what is on my boat, but not for the sinks but for the showers. As the drain is clearly below the waterline it drains into a grey water tank were a bilge pump type pump pumps it out. The suggestion to make sure you have an inline strainer, particularly at the sink is important.
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02-03-2020, 17:49
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#9
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Registered User
Join Date: Apr 2019
Boat: Jupiter 40 built by Klaus Baess 1968
Posts: 79
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Re: Tell me why this is a bad idea
Quote:
Originally Posted by Zzmeyer
By the way, your idea is what is on my boat, but not for the sinks but for the showers. As the drain is clearly below the waterline it drains into a grey water tank were a bilge pump type pump pumps it out. The suggestion to make sure you have an inline strainer, particularly at the sink is important.
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I think I’ll put in a tank and do the same, makes sense
Thanks for that
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02-03-2020, 18:30
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#10
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Registered User
Join Date: Oct 2015
Posts: 2,007
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Re: Tell me why this is a bad idea
My boat has a deep part of the bilge walled off as a "gray water sump." All showers, sinks, and incidental water drain to there where a diaphragm pump moves it overboard controlled by a float switch.
The reason is not that the sinks are below the water line, but rather it eliminates half a dozen through hulls.
It takes a pump suitable for the kind of "chunky" water that can come from a sink, and a float switch that won't clog. But with good engineering it works great.
The worst part of the arrangement is that it needs cleaning occasionally. But I'll happily trade that yucky job for the reduced number of holes in my hull!
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02-03-2020, 23:57
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#11
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Registered User
Join Date: Sep 2008
Location: On the boat, somewhere in Australia.
Boat: Swanson 42 & Kelly Peterson 44
Posts: 9,181
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Tell me why this is a bad idea
I drain my shower into a big bit of Tupperware in the bilge. Inside the Tupperware container is a $20 bilge pump, a mesh strainer on the input hose and a float switch. Using the Tupperware means you get a good strong lid included to contain the smells and the whole thing is very easy to clean.
I reckon the same setup would work for the sink, but you’d have to be prepared for a pretty yucky cleaning job once a month or maybe more often.
__________________
Refitting… again.
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03-03-2020, 00:26
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#12
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Registered User
Join Date: Nov 2013
Location: Nice, France
Boat: Hunter Marine 38
Posts: 1,342
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Re: Tell me why this is a bad idea
It would be wise to use a macerator pump in this setup. Less cleaning of filters and a more robust functioning. These pumps can take a lot of sh.t.
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03-03-2020, 08:57
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#13
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Registered User
Join Date: Feb 2017
Location: Arizona
Boat: Morgan Catalina 45
Posts: 72
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Re: Tell me why this is a bad idea
As long as you have a regular strainer insert in the sink I think you should consider one of these. I have one for a shower and it works great. You still want it to pump to a vented loop etc. Mine pumps to one of my cockpit drains.
It works flawlessly and I only need to clean the screen every 4 months or so.
there are lots of them available and I just chose this one from amazon as an example, not exactly what I have but they all seem to be about the same. It can also accept more than one sink hose.
https://www.amazon.com/DasMarine12V-...3254211&sr=8-4
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03-03-2020, 09:05
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#14
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Registered User
Join Date: May 2013
Location: Morro Bay, CA
Boat: Herreshoff 28 modified ketch- wood
Posts: 379
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Re: Tell me why this is a bad idea
I replaced my sinks with buckets. No leaks. No blockages. Fewer thru-hulls. No maintenance.
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03-03-2020, 10:00
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#15
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Registered User
Join Date: Jul 2014
Location: Harbortown - Merritt Island, FL
Boat: 1998 Sealine Statesman 42ft - Twin Cummins 6BTA
Posts: 208
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Re: Tell me why this is a bad idea
I love my whale shower sump diaphram pump. It never fails and I haven't had to clean it in two years (screens on shower drains). It comes with a water sensor so it knows when to come on.
I recommend a good pump like this for all your below water sump needs.
Ditto on the vacuum break.
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