ASME Bladder Tanks, Storage Tanks & Pressure Vessels

Expansion Tanks

ASME Expansion Tanks

AAtanks offers three ASME expansion tank designs: Bladder, Diaphragm and Compression. Tanks range in size from 2 to 10,000 gallons. Most of AAtanks expansion vessels are designed using a pre-pressurized vessel with an internal bladder or diaphragm to manage fluids under pressure. Custom tanks are produced to customer specifications, for high pressures and/or special materials for severe duty applications.

NLA Expansion Tanks

AAtanks NLA bladder style expansion tanks are designed to absorb the expansion forces and control the pressure in heating/cooling systems. The systems expanded water (compatible with water/glycol mixtures) is contained in a replaceable heavy-duty butyl rubber bladder preventing tank corrosion and water logging. The NLA Series Expansion Tanks are manufactured to ASME specifications. The NLA series are industries broadest line of bladder style tanks. These vessels are offered in standard sizes ranging from 10 to 4,000 gallons, with working pressures of 125 psi (standard), 200 and 250 psi.

NLA 35 to 800 Expansion Bladder Tanks

Download NLA 35 to 800 Expansion Bladder Tanks Submittal Form

NLA 1000 to 15000 Expansion Bladder Tanks

Download NLA 1000 to 15000 Expansion Bladder Tanks Submittal Form

Construction:

  • ASME Construction
  • Material: Carbon Steel or Stainless Steel (304/316)
  • System Connection: Carbon Steel
  • Bladder: Heavy Duty Butyl Rubber (NSF / FDA approved materials)
  • Factory Pre-charge: 12 PSI (field adjustable)
  • Standard Design Pressure: 125 PSI (200 PSI & 250 PSI models available)
  • Standard Design Temperatures: -20F to 240F
  • Standard Finish: Red Oxide Prime Painted
  • Interior and Exterior Epoxy Finish Available Upon Request
  • Custom Designs Available

NTA Expansion Tanks:

AAtanks NTA Tanks are ASME-code diaphragm type pre-charged expansion tanks. They are designed to allow the tanks air cushion to be separated from the systems water. No waterlogging of the tank can occur as the air is held between the tank wall and the outside of a bladder placed inside the tank, while the system water is contained inside the bladder.

NTA Hydro-pneumatic Tanks.

Download NTA Expansion Tank Submittal Form [.pdf]

Construction:

  • ASME Construction
  • Material: Carbon Steel
  • System Connection: Carbon Steel
  • Diaphragm: Heavy Duty Butyl Rubber (NSF / FDA approved materials)
  • Factory Pre-charge: 12 PSI (field adjustable)
  • Standard Design Pressure: 125 PSI (200 & 250 PSI available)
  • Standard Design Temperatures: -20F to 240F
  • Standard Finish: Red Oxide Prime Painted

NA/NAG Expansion Tanks:

AAtanks NA/NAG tanks are ASME-code compression type expansion tanks. Compression tanks are designed to absorb expansion forces and control the pressure in heating/cooling systems. This tank design is most efficient when the air is controlled and kept in the tank, not in the system.

  • Plain steel tanks have a common interface between the liquid, water, and the air in them. This interface allows the air to be reabsorbed by the water and thus must be controlled by use of air separation devices.
  • Plain steel tanks must be installed above the air separation device to enable the separated air free passage back into the tank. The size and total tank and water weight must be considered during construction.
  • Plain steel tanks are installed in the system with air at atmospheric pressure. This air will be compressed by water as the system is filled and brought up to minimum operation pressure or fill valve pressure. This filling action will fill the tank approximately 50% full or more before the system is put in operation. This increases the size of the tank and adds to the total weight.

NA Expansion Tanks

Download NA Expansion Tank Submittal Form [.pdf]

NAG Galvanized Expansion Tanks

Download NAG Galvanized Expansion Tank Submittal Form [.pdf]

Construction:

  • ASME Construction
  • Material: Carbon Steel
  • System Connection: Carbon Steel
  • Standard Design Pressure: 125 PSI (200 & 250 PSI available)
  • Standard Design Temperatures: -20F to 450F
  • Standard Finish: Red Oxide Prime Painted
  • Custom Designs Available
  • Stainless Steel Models Available