Horizontal Bladder Tanks

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The CHEMGUARD bladder tank is a steel pressure vessel, which stores a foam concentrate within an elastomeric bladder. The concentrate is discharged from the tank by incoming water applying pressure to the bladder. This applied energy is transferred to the concentrate, supplying pressurized concentrate to the proportioner (Proportioners are separate items described on a separate data sheet).


The CHEMGUARD Bladder Tank is one component of a balanced pressure proportioning system. CHEMGUARD Bladder Tanks require only a pressurized water supply for operation. No other external power is required. They can be used with one or more CHEMGUARD proportioners and any suitable discharge device to create a complete the foam system. CHEMGUARD Bladder Tanks can be used with most CHEMGUARD foam concentrates.

CHEMGUARD bladder tanks have numerous applications including aircraft hangars, foam-water sprinkler systems, truck loading racks, and helipads.


  • UL Listed and FM Approved for use with various CHEMGUARD proportioners and foam concentrates
  • 175 psi (12.1 bar) maximum allowable working pressure (design pressure)
  • Nominal capacities up to 3,000 gallons with larger tanks available on special request
  • Tanks up to 800 gallons meet the requirements for Seismic Zone 4 earthquake resistant design
  • Available with brass or 316 stainless steel trim piping and valves
  • Options for grooved, NPT, and flanged connections
  • Choice of Standard or Corrosion-Resistant Epoxy exterior paint, available in a variety of colors
  • Optional sight gauge and thermal pressure relief valves available

Approvals and Certifications

CHEMGUARD bladder tanks are UL Listed and FM Approved for use with various CHEMGUARD foam concentrates and proportioners. The UL mark and FM Approval diamond are applied at the factory along with a label identifying the CHEMGUARD foam concentrate for use in the tank.

Every tank bears a permanently affixed ASME data plate showing the National Board number which identifies the tank as compliant with ASME code Section VIII, Division 1 for unfired pressure vessels.

CHEMGUARD bladder tanks 200 gal (757 L) and larger are CE marked in conformance with the European Pressure Equipment Directive, 2014/68/EU. Under European Pressure Equipment Directive 2014/68/EU, tanks smaller than 200 gal (757 L) are acceptable based on sound engineering practices of ASME code and cannot be CE marked.

CHEMGUARD bladder tanks up to 800 gal (3,028 L) meet the minimum requirements for Seismic Zone 4 Earthquake Resistant Design as calculated according to the 1997 Uniform Building Code.