Expansion and Pump Tanks

  • Series of pump tanks and potable & hydraulic expansion tanks
  • Volumes from 2 – 115.9 gallon

Pump tank

  • Non-corrosive metal air valve
  • 100 PSI working pressure
  • Multiple head construction provides added structural strength and more capacity within the same diameters.
  • Interior powder coating is permanently bonded to the tank shell to provide the ultimate protection on the water side of the tank.
  • Durable butyl rubber parabolic diaphragm ensures long life and prevents rubbing on tank wall or rolling over on itself.
  • Positive lock retention system ensures quality controlled compression in the diaphragm. The connection eliminates loss of air or water leaks in the tank.
  • Electrostatically applied powder coated exterior. Tough powder coating provides maximum resistance to sunlight (UV) and is undercoated with zinc phosphate for the highest corrosion resistance.
  • No-weld guard steel base

Potable & hydronic expansion tank

  • Drawn steel construction
  • Heavy duty butyl rubber diaphragm
  • Maximum working pressure 150 PSI – potable only
  • 100 PSI max – hydronic only
  • Powder coated interior and fitting
  • Drawn steel construction

Sample specification

The tank(s) shall be A. O. Smith model no PM________ or an approved equal. Tanks(s) shall be rated for 100/150 psi working pressure. Vessel shall be internally coated for corrosion protection. A durable butyl diaphragm will ensure long working life. The complete product will be NSF 61 certified and listed.

NSF certified

Expansion and Pump Tanks



Pump expansion vessels


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