Bulletin T 1000 A
DIAPHRAGM & BLADDER TYPE THERMAL EXPANSION TANKS
THE BEST PROTECTION FOR THERMAL EXPANSION
BACKSTOP® Thermal Expansion Tanks
HEADQUARTERS: 465 N. Berry St. • Brea, CA 92821 • TEL: 714 674-0590
BLADDER TYPE THERMAL EXPANSION TANKS
BACKSTOP Type AC thermal expansion tanks are designed for use on potable
hot water systems to absorb expanded water and prevent the dangerous buildup of
pressure. As the water is heated, thermal expansion occurs and water is forced into
the pre-charged thermal tank. The pre-charged air cushion returns water to the
system when delivery is required at various fixtures. This arrangement prevents
unnecessary relief valve operation, which results in wasted water and energy costs,
and eliminates potential internal component damage to water heaters. All AC
Backstop thermal tanks come equipped with a heavy duty butyl bladder and stainless
steel system connection. Use Backstop thermal tanks for residential, institutional,
industrial and commercial applications.
TYPE AC EXPANSION TANKS
ASME fixed bladder expansion tanks for commercial and industrial installations.
Space saving tank comes in sizes of 3.5 gallons to 90 gallons.
• ASME Section VIII Construction and Label
• Permanent separation of air and water, never water logs.
• Smaller sizes for easier handling, saves space and installation costs
• Stainless steel system connection
• Can be manifolded for more capacity
• Factory pre-charged at 35 psig and field adjustable
TYPICAL SPECIFICATIONS Furnish and install as shown on plans a
“(high) pre-charged steel thermal
expansion tank with a fixed FDA approved butyl bladder.. The tank shall have a top NPT stainless steel system
connection and a .301” - 32 charging valve connection (standard tire valve) to facilitate the on-site charging of
the tank to meet system requirements. The tank must be constructed in accordance with Section VIII of the ASME
Boiler and Pressure Vessel Code and stamped 150 psi worki