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Frequently Asked Questions - Water Pumps

How to have a quiet 12 Volt pump

Most of the problems lie with the fact that water hates being moved. Here are some ways to reduce the noise:

  • Don’t over-tighten the screws on the base. Over-tightening the pump’s attachment screws compresses the rubber mountings, hindering their ability to absorb sound energy.
  • Have a truly rigid mounting base. If you knock on the proposed base and it responds like a drum, it’s going to worsen pump noise. Another effective solution is to place a small piece of carpet between the pump and its base.
  • Use the thinnest hold-down screws that will adequately hold the pump.
  • Use flexible piping. It is surprisingly effective at dampening sound - try including about 350 mm of truly flexible piping between in a very loose loop between the pump and any hard plumbing on the pump inlet and outlet. If they are unable to move freely a lot of noise will be transmitted via these pipes. The difference in transmitted noise is so great that it can be worthwhile connecting each pipe using a full loop.
  • Avoid elbow fittings close to the outlet port. They cause turbulent water flow and also back pressure – both of which generate noise. Use smooth curves rather than right angle bends.
  • Prevent vibration in the wall cavity. Another cause of transmitted noise including water hammer is vibration where plumbing passes through a wall. During installation ensure the pipes are unable to move especially where they go through a wall. Use plastic foam or insulation to keep them in place.
  • Trapped air causes plumbing to rattle. It is desirable to bleed all air from the system to prevent this.
  • Add an accumulator tank. This will dramatically reduce the noise, pulsation, pump circulation and will extend the life of your pump. The result is a smooth and quiet stream of water.

If you follow these steps you will have a pump which makes no more noise than a good sewing machine. Truly.