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 MSD Installation		  New Topic  Topic Locked
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Initially Posted - 03/25/2007 :  13:46:25  Show Profile
OK, here is the latest project – installing a MSD porta-potti with a pumpout and vent. The goal is a low maintenance head with no hauling of the tank to dump. There is a free pumpout at our lake.

The first photo shows the Thedford MSD. It has a 5 gallon waste tank which I am told is equivalent to a 15 gallon holding tank on a traditional marine head because the porta-pottis use much less water. Note that the wet locker door must be trimmed to allow it to open past the MSD.



Looking up from the aft berth at the aft of the wet locker. I installed an inspection port in order to access and connect the hoses and deck plates. Working on the hoses through that hole left my shoulders sore for several days!



This is the view from the wet locker door showing the hoses going to the deck plates.



This is the view as the hoses go through the aft head bulkhead. Note that I increased the vent size from ½” to 1” in order to allow more air flow and to improve the ability to put water down the vent during pumpout.



Waste outlet and vent on the port coaming area. Locating them close together lets me put hose water down the vent while pumping out. This helps clean the tank. I was very lucky with the vent location. It should be 1” higher.



The Captain on his throne. No photo.


We cannot direct the winds but we can adjust our sails.
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 03/25/2007 :  17:35:52  Show Profile
Nice Mod Randy. Seems like the best of both worlds. Seems to make a lot more sense than converting to a "proper" marine head for those of us that will never be far enough off-shore to dump. I might tap your brain for questions in the future. Likely to be next year though. Already spent enough without a single puff of wind for this year.
Any issues venting near the cockpit rather than further aft?
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 03/25/2007 :  23:11:40  Show Profile
John, thanks. I'd be glad to give you more details. We'll see how the vent goes. The experts say to keep the vent run as short as possible and always on the rise. No way to do it on a C250 but some advise putting the vent near the bow so that air is pushed in it as the boat moves forward. I don't expect it to be an issue.
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SEAN
Admiral

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USA
772 Posts
Response Posted - 03/26/2007 :  07:55:38  Show Profile
looks good ,
We use odorless everytime we use the head ,
well before we leave the boat . Seems to work.

I also added this step I found when your sitting on the
head , my left foot is very unconfortable so maybe this will help.
I will just silicone it in after I finish it .
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essen48183
Navigator

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USA
143 Posts
Response Posted - 05/05/2009 :  19:12:29  Show Profile  Visit essen48183's Homepage
This is my next project. This post along with the info at the bottom of this webpage is what I'm going on. Just wanted to share the link.
http://www.boatbuilding.com/article.php/MarineSanitationFactvsFolklore/print
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dbpaul
Deckhand

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USA
5 Posts
Response Posted - 05/05/2009 :  19:45:38  Show Profile
<font color="blue"><font size="4"><font face="Comic Sans MS">Nautiduck
Larger pictures would be appreciated.
I enjoy looking at pictures on this site.

paulj</font id="Comic Sans MS"></font id="size4"></font id="blue">
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essen48183
Navigator

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USA
143 Posts
Response Posted - 05/05/2009 :  20:01:26  Show Profile  Visit essen48183's Homepage
it's a prob with the forum. all pics are hosted elsewhere - your choosing. Some people put up pictures and the 3rd party host they have chosen resizes them after 6 months or a year with no warning to save space. These pictures used to be large and clear when he posted them.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 05/05/2009 :  20:59:23  Show Profile
Here's a variation on the same theme (in my head)--a Dometic system (throne and tank), but with a 9-gallon tank, pumpout, and china bowl. Simple, self-contained, easy-to-use, and (so far) <i>totally</i> odor free. I think a lot of the odor issue, compared to many "marine heads", is that it runs off my fresh-water system, not salt.
Edited by - Dave Bristle on 05/05/2009 21:00:07
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ruachwrights
Captain

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USA
258 Posts
Response Posted - 05/06/2009 :  04:37:00  Show Profile  Visit ruachwrights's Homepage
I liked your mod as well. Any suggestions for creating an adapter system for the origional portipoti so that you could take the poti out on deck and flag down the pooper scooper boat?
This is a picture of the boat I purchased in November and was able to sail all of three times. Can't wait till Friday's splash date!!!
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 05/06/2009 :  12:46:00  Show Profile
Shutterfly downsizes the pics after a few months. Here is a link to the album where those photos are stored.

[url="http://www.shutterfly.com/lightbox/view.sfly?fid=90b48f393267760c3315f89dbf2f35f7"]MSD Install[/url]

You can double click to see them larger. You can even buy copies!

Dave, I considered that 9 gallon unit but our boats do not have the fresh water tankage for it. Agreed about salt water. Once last year, out of desperation, we put salt water in the porta-potti. Yikes! Won't make that mistake again!!
Edited by - Nautiduck on 05/06/2009 12:48:40
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.