In some applications, high pressure is essential (as we saw in our washdown pump test). While pump efficiency is not as critical in a potable water system as it is in our bilge pump system, we still want to maximize the system’s efficiency by minimizing the loss of hydraulic head pressure (also called head pressure). The other option is to add a pre-formed loop, “swoop,” or elbow. To avoid kinks, small diameter tubing (like ½-inch) can be used, but this introduces friction into the system that can affect pump efficiency. – PEX tubing can be bent to a 3-inch radius, but it kinks more suddenly, sharply and severely than the softer PVC. – Heavy-duty reinforced PVC can be bent to fit even tighter turns.
– Equivalent sized reinforced PVC can be bent in a radius that is about 25 percent tighter. – ¾-inch clear PVC can be bent over a 4-inch radius.
– 5/8-inch clear PVC can be bent over a 3-inch radius. – ½-inch clear PVC can be bent at 65☏ to about a 2-inch radius before it kinks. In general, small diameter PVC, either clear or reinforced, will withstand sharper bends than larger sizes. Our finding should help you decide how to best route your new hoses as you make any plumbing changes. We carried out the test at room temperature, and then after the hoses had been immersed in hot water. In a comparison of five varieties of tubing in various sizes, we bent 1-foot sections over a measured grid until each hose first flattened discernibly and then kinked, usually suddenly. Kink resistance can be impacted by three factors: (1) the size of the tubing (including wall thickness) (2) the temperature of the water inside (2) the tubing brand. Coast Guard.īut which tubing best withstands the bending needed to lead the water lines through the torturous routes they often must take? The risk is a kink, which severely restricts the flow of water, burdens the water pump and hastens the day when the plastic becomes brittle and cracks. The hoses and coupling methods should follow guidelines set by the EPA, ABYC, and other regulatory agencies, including the U.S. Before beginning any plumbing project, the do-it-yourself should be careful to use the right hose for the job. It is simple to install, and the hose, connecting hardware ( hose clamps) and fittings are readily available. When plumbing a boat’s pressure water system, flexible tubing is inevitably part of the equation.
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