ASME Tanks: How do Hydropneumatic Tanks Work?

Hydropneumatic tanks are ideal for any organization or community that needs to store water under pressure. When discussing hydropneumatic tanks, it’s not uncommon to hear the term ASME. ASME refers to any tank that has been certified to meet the standards of the American Society of Mechanical Engineers. Hydropneumatic tanks can be stamped ASME or built to ASME standards.

The most common application for a hydropneumatic tank is in water supply systems. Some examples include:

  • Well water pump systems
  • Irrigation/sprinkler systems
  • Booster pumps

Keep on reading to learn more about hydropneumatic tanks!


How is Pressure Generated?

Pressure is generated in a hydropneumatic tank one of two ways: an air volume control system or an air-charging system.

Air Volume Control System

When an air volume control system is implemented, air is dissolved into the water of the tank. This causes the water level to rise and the air pressure to fall. When the system recognizes that the water level and air pressure have reached a certain point, an air compressor pumps air into the tank to restore pressure.

Air Charging System

More common on older galvanized tanks, air charging systems add and release air into the tank mechanically without the use of sensors. Instead, mechanical systems are engaged to maintain the proper balance between air and water.

The Benefits of Compressed Air

Compressed air in a hydropneumatic tank serves several functions.

  • Reduced Energy Costs: Compressed air reduces energy costs associated with running the pump
  • Prolongs the lifespan of the pump
  • Reduced Pump Cycling: Compressed air reduces the frequency of pump cycling by delivering water that is already pressurized and in the desired pressure range.
  • Prevents short cycling
  • Controls surges that can be caused by the pump turning on and off.

To learn more about hydropneumatic tanks, contact Tanks Direct at [email protected] or call 800-865-5555.




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