T&T: Rigid Piping for Sanitation Systems

[rbrun360 at aol.com]

Date: Sun, 2 Dec 2007 20:52:57 -0800
From: "Dan Winchester" <danw at dwinchester.com>
Subject: T&T: Rigid Plumbing
To: "Trawlers-and-Trawlering"
??? <trawlers-and-trawlering at lists.samurai.com>
Message-ID: <000001c83568$6021adf0$6601a8c0 at razzlaptop>
Content-Type: text/plain; charset="us-ascii"

"There have been numerous posts about rigid plumbing and the pros and cons."

Peggie Hall and I will probably have differing opinions on this subject. Having installed many systems and trained marine sanitation installers,the use of PVC is encouraged, particularly in areas of standing sewage. I have plumbed some boats entirely in PVC schedule 40 with never a failure.?The reason I use PVC schedule 40 is that Schedule 80 is more expensive and Schdeule 40 is more forgiving under horizontal?load in long runs.?Internal pipe pressure in?not an issue in marine sanitation.?ABS has been used in boats but the availability of fittings and gluing between PVC and ABS is not encouraged unless you use specialized glue. Any place where PVC will be under stress the?use of a short length of hose will be necessary. The Dometic Sealand Corp. offers many specialized fittings in PVC schedule 40 to go from hose to pipe (hose adapters,etc.) which make installation easier and faster. These?fittings are available from West Marine and most marine distributors.?Always use PVC glu
 e?containing Tetrahydrofuran and?I use a primer for leak proof joints. There other details necessary for a proper installation and I will be happy to discuss and answer any questions off list.
Richard Brunson
Living aboard in Seattle.
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