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Old 06-11-2021, 20:32   #1
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Join Date: Jan 2014
Location: Florida
Posts: 946
Head Help

Hi Friends,
Still refitting the Irwin 44
Older boat, two heads but no holding tanks.
The plan is to leave one a direct overboard
head with the proper lock outs.
The other one we are not really up for the task
of cutting things apart to install a proper
large holding tank so we plan on installing
a Dometic 711 self contained MSD.
Thanks to Peggy for mentioning this unit in
her book.
The question is,in addition to a deck
pump out, we want to be able to empty at sea
so i’ve come up
with the configuration in the attached drawing.
I’ve scoured the forum and other sites looking
for an exact diagram of what I want to do
and haven’t found anything.
So will this work and be odor free?
I am well aware of the pertinent discharge
and lockout requirements so no need to beat up
on that aspect.
Vented loop of the overboard discharge to be
above heeled waterlines.
Any comments on a macerator as opposed
to a whale gusher diaphragm type pump?
Thanx all
Definitely out of my wheelhouse here
Cheers
Neil
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Old 08-11-2021, 09:41   #2
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Boat: Tashiba 40
Posts: 50
Re: Head Help

Your macerator pump needs to be on the other side of your vented loop.
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Old 08-11-2021, 10:14   #3
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Location: Fiji Airways/ Lake Ontario
Boat: Legend 37.5, 1968 Alcort Sunfish, Avon 310
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Re: Head Help

Quote:
Originally Posted by Weatherbird View Post
Your macerator pump needs to be on the other side of your vented loop.
Why?

Unless the output of the macerator is dead level with the output end of the vent loop there will be effluence sitting.
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Old 08-11-2021, 10:28   #4
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Location: New Orleans
Boat: Tashiba 40
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Re: Head Help

Quote:
Originally Posted by Tetepare View Post
Why?

Unless the output of the macerator is dead level with the output end of the vent loop there will be effluence sitting.
The vented loop is there to prevent siphoning. If it's before the pump then the pump is going to just suck air through the vent in the loop and leave the effluence sitting in the tank.
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Old 08-11-2021, 12:33   #5
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Join Date: Mar 2019
Location: Live aboard in Simonstown (Cape Town) - now Grenada having crossed the Atlantic.
Boat: 1986 Bruce Roberts 45 raised saloon
Posts: 374
Re: Head Help

Quote:
Originally Posted by Weatherbird View Post
The vented loop is there to prevent siphoning. If it's before the pump then the pump is going to just suck air through the vent in the loop and leave the effluence sitting in the tank.
Unless you install a vent valve that closes the vent as soon as power is applied to the pump.
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Old 08-11-2021, 13:26   #6
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Join Date: Sep 2014
Location: Fiji Airways/ Lake Ontario
Boat: Legend 37.5, 1968 Alcort Sunfish, Avon 310
Posts: 2,749
Images: 11
Re: Head Help

Quote:
Originally Posted by Weatherbird View Post
The vented loop is there to prevent siphoning. If it's before the pump then the pump is going to just suck air through the vent in the loop and leave the effluence sitting in the tank.
Doh. VENTED loop. Failure to read. Failure to see in image anything other than what I wanted to see. Thanks.
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Old 10-11-2021, 04:36   #7
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Posts: 141
Re: Head Help

The simplest solution is to connect the holding tank to the deck fitting .

When pump out is needed an Edson or similar diaphram hand pump is brought out and at a gallon a stroke it doesn't take long.

No hassles with the Coasties as the system is so simple.

The pump also works as an emergency bilge pump or dink pump.

KISS
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