Expansion Tanks

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 andor 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 heatingcooling systems. The systems expanded water (compatible with waterglycol 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 (304316)
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
NANAG Expansion Tanks:
AAtanks NANAG tanks are ASME-code compression type expansion tanks. Compression tanks are designed to absorb expansion forces and control the pressure in heatingcooling 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