Fresh Water Tanks
Requirements for fresh water tanks are different than black water or grey water tanks. Fresh water tanks are designed with the following features:
- Most tanks are gravity fed to a hand pump or a low volume electric pump and therefore do not see the high vacuum pressures which waste tanks may encounter.
- However, during the filling of the tank most marinas use city water pressure. City water pressure can be as high as 80 psi. allowing for damage to occur during filling if the tank vent is blocked or restricted.
- Stocks sized molded tanks work well for water tanks and are typically made from standard HDPE (High Density Polyethylene). Polyethylene is quite odour free and tends not to harbor bacteria. Custom tanks can be made using standard HDPE or we can use a hybrid material such as HMW-PE (High Molecular Weight - Polyethylene) which is more resilient (it has more stretch even in sub zero temperatures).
- Black Sclair pressure rated water pipe can be used to store drinking water. This is a NSF certified pipe made from pigmented PE by KWH. From KWH - PE Pipe manufacturer"s website.
Question:
Is Sclairpipe certified for potable water use?
Answer:
Yes. KWH stamps Sclairpipe piping or fittings used for potable water with the initials NSF. This means the product conforms to NSF Standard 14 "Plastic Piping components and Related Materials" and Standard 61 "Drinking Water System Components-Health Effects". Pipe marked with CSA logo and "CSA 137.1" initials is also suitable for potable water use.
Rethinking Your Water Tank Requirements
Custom tanks can be designed to maximize living space; tall rectangular or cylindrical tanks can be placed in corners, in compartments, under seats, in seatbacks etc. Since fresh water tanks don't contain solids, tanks can be made long and slim. (a 4" diameter pipe x 48" long will hold 20 liters (5 US Gal) of water. Changing the location of your freshwater tank can make room for more holding or water tank capacity.
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