High Purity Water Design Parameters


  • Polyvinylchloride (PVC) schedule 80
  • Must be cut with an approved PVC cutter all burrs cleaned off. Chamfering tool to be used to round edges.
  • Polyvinylidenefluoride (PVDF)
  • Polypropylene (PPE)
  • Stainless Steel (Heat Sanitizable)
  • Use of any other metals other than 316 SS is not permitted.


  • 90 degree turns the turns should be accomplished with 45 degree angles. When at all possible, a return loop should be used to minimize bacterial growth through movement of water in the system.
  • Return velocity must by a minimum of 3FPS with averages 4-7 FPS. Much higher than that you can get noise.
  • Dead legs must be avoided. The length of an unused portion of pipe should be between 3-5 times of the pipe diameter as a maximum. Best practice is 3 times when at all possible. Dead-leg definition: An unused portion of pipe greater in length than six diameters of the unused pipe measured from the axis of the pipe in use.
  • Approved ball true union valves should be used that are less restrictive than gate valves.

Water Storage Storage

  • Storage of the water should be in a conical bottom tank if cleaning are to be done on a regular basis. Spray balls or a spray bar have the added advantage of reducing bacterial growth in theory.
  • A hydrophobic vent filter should be installed on the tank and a sealed system otherwise. This is to control airborne bacteria from entering the tank.

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