Bladder Expansion Tanks

Bladder tankBladder expansion tanks have a totally replaceable bladder and are often referred to as replaceable diaphragm tanks. This tank must be equipped with large service openings that allow the bladder to be replaced without having to remove the tank from its mounting.

Bladder tanks are required in a closed loop heating or chilled water HVAC system to absorb the expanding fluid and limit the pressure within a heating or cooling system. A properly sized tank will accommodate the expansion of the system fluid during the heating or cooling cycle without allowing the system to exceed critical pressure limits.

The expansion tank uses compressed air to maintain system pressures by accepting and expelling the changing volume of water as it heats and cools. Some tank designs incorporate a diaphragm or bladder to isolate the expanded water from the pressure controlling air cushion, which is pre-charged at the factory and can be adjusted in the field to meet critical system requirements. This design and operation of this style of expansion tank allows the designer/specifying engineer to reduce tank sizes up to 80%.

Size Your Tank

Were you looking for a non-replaceable bladder tank?

  Divider

ASME StampNLA Series (ASME)

The NLA is the industry’s broadest line of bladder style tanks with a range of features that include:

  • ASME certified
  • Heavy-duty replaceable butyl bladder
  • Sizes range from 10 to 4,000 gallons
  • Working pressures of 125 psi (std), 200 and 250 psi

NLA 35-800L
Download submittal

NLA 35-800L HP (High Pressure)
Download submittal

NLA 1000-15000
Download submittal

NLA 1000-15000 HP (High Pressure)
Download submittal

  Divider

ASME StampNVA Series (ASME)

  • ASME certified
  • Bottom system connection design
  • Heavy-duty replaceable butyl bladder
  • Sizes range from 20 to 4,000 gallons
  • Working pressures of 125 psi (std), 200 and 250 psi

NVA 85-800L
Download submittal

NVA 1000-15000
Download submittal

  Divider

NLAP Series (ASME)

ASME Stamp

NLAP Expansion Bladder Tanks:

Download submittal

  Divider

NL Series (Non-ASME)

Non asme

NL Expansion Bladder Tanks:

Download submittal