Boat plumbing is easy considering there are no pipes. The pipes in a yacht are replaced by flexible hoses which is easier to use.
Here are a few guidelines for your on-board water system.
Tanks are best mounted low in the boat as it will be simple to add extra tanks given the space available. You can choose either a rigid polyethylene tank or flexible tank.
Make sure that the vent of the tank is not higher than the fill to avoid overflow and use Teflon tapes on all threaded fittings. Avoid over tightening the fittings in plastic tanks and always secure hoses with stainless steel hose clamps.
The hose that supplies drinking water should be non toxic, non-contaminating, taste free and approved by FDA. The common choice for water hose is PVC reinforced with polyester braid. The hoses that will be used for draining purposes should be stronger than vinyl hose. For this, the best option is reinforced rubber hose. Make sure to double clamp all the hoses that are connected through hull fittings.
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