Atmospheric Polyethylene Concentrate Storage Tanks

Printable Page


Standard Chemguard Atmospheric Foam Concentrate Storage Tanks are manufactured in Crosslinked polyethylene in vertical configuration. Chemguard also offers custom made tanks in stainless steel (304 or 316), carbon steel, and fiberglass. Vertical tanks are normally manufactured with flat bottoms and dome tops and horizontal tanks sit on saddles.

The fiberglass and polyethylene tanks do not have expansion domes due to the dome shape of the top of the tank. Inspection hatches are provided on both style tanks. Regardless of the material of construction, a pressure/vacuum vent must be installed. This is normally installed on the inspection hatch on the fiberglass or molded polyethylene tanks and on the cover of the expansion dome on the carbon or stainless steel tank.


If using a carbon or stainless steel tank with AFFF type foam concentrates, Chemguard does not recommend lining the inside tank shell. The reason is that the tank and the liner have different coefficient expansion ratios during various ambient temperature cycles.  Over time, pinholes may occur in the lining.  AFFFs having a very good wetting ability will penetrate the pinholes and get in between the lining and the tank shell.  Eventually portions of the lining may flake off and travel into the foam concentrate system, subsequently blocking orifices, strainers, etc.  Upon receipt of your order and before any installation, inspect the tank for any damage that may have occurred during shipping to trim valves, piping, etc.

Chemguard does not supply any interconnecting piping, strainers, valves, etc. that are not specifically mentioned on any quotation or sales order.
When using AFFF or AR-AFFF type foam concentrates in any atmospheric type storage tank, it is recommended by Chemguard that a thin layer (approximately 1/4 inch) of a quality mineral oil be placed on the surface of the foam concentrate after
filling the tank with the correct quantity. This alleviates the problem associated with evaporation of the foam concentrate.

If any AFFF concentrate spills on any painted surface during any filling of the storage tank(s), immediately wash the area with water. The solvents in the AFFF may cause streaking of any painted surface.

It is recommended that when using non-freeze protected foam concentrates, that the foam tanks be located in an area that is kept between  35ºF-120ºF.   All tanks offered by Chemguard are suitable for use with Chemguard manufactured and supplied foam concentrates.


If the tank has been received in a satisfactory condition, place the tank in the desired level location and if necessary, anchor to the floor. If possible, leave an area around the tank free from any walls, obstacles, etc. This gives working space for connecting the foam system piping to/from the tank.


Piping Materials: Standard schedule 40 black steel (when kept full of foam concentrate or a “dry pipe" system) and stainless steel pipe is suitable for use with Chemguard manufactured AFFF/AR-AFFF types of foam concentrates.

Galvanized pipe should not be used with any AFFF/AR-AFFF concentrates. AFFF’s have a solvent in their formulation, which may dissolve standard pipe joint compound (pipe dope) normally used with plain water sprinkler systems.  When installing a foam water fire protection system using AFFF concentrates, it is recommended where the concentrate or the solution is in contact with any pipe joints etc., a quality Teflon TM tape in accordance with MIL-T-27730 and a Telfon TM based pipe joining compound be used on all threaded fittings.


Note:   All tanks come with the following:

  1. Pressure/Vacuum Vent
  2. Flanged Drain Valve
  3. Flanged Suction Fitting
  4. Flanged Return Fitting

(1)  Molded in Gallonage Marker

Part No. Capacity (gal.) Inspection Cover Size (in.) Drain Valve Size Height (in.) Diameter (in.)
CAST100 100 7 1” 64 23
CAST200 205 7 1” 71 31
CAST350 385 17 1” 58 48
CAST495 495 17 1” 46 64
CAST600 615 17 1 ½” 88 48
CAST800 805 19 1 ½” 114 48
CAST900 905 19 1 ½” 76 64
CAST1000 1000 17 1 ½” 53 86
CAST1100 1100 17 1 ½” 82 73
CAST1300 1300 19 1 ½” 67 85
CAST1450 1450 16 1 ½” 73 86
CAST1550 1550 17 1 ½” 141 61
CAST1700 1700 17 1 ½” 115 73
CAST2000 2000 17 2” 89 89
CAST2400 2400 17 2” 152 73
CAST2550 2550 24 2” 120 85
CAST2850 2850 24 2” 127 90
CAST3000 3000 24 2” 140 85

Select from the following the required tank suction and return fittings:

-S1 1 ½” Stainless steel flanged connection with PVC internal drop tube
-S2 2” Stainless steel flanged connection with PVC internal drop tube
-S3 3” Stainless steel flanged connection with PVC internal drop tube
-S4 4”Stainless steel flanged connection with PVC internal drop tube
-R1 1 ½” Stainless steel flanged connection with PVC internal drop tube
-R2 2” Stainless steel flanged connection with PVC internal drop tube
-R3 3” Stainless steel flanged connection with PVC internal drop tube
-R4 4” Stainless steel flanged connection with PVC internal drop tube

An optional low-level switch is available. Specify option –LS when ordering.


CAST 100-S1-R1-LS specifies 100-gallon tank with 1 ½” suction, 1 ½” return fittings and a low-level switch. Tank will come standard with Pressure/Vacuum Vent, Inspection Hatch, molded in gallonage marker and drain valve size listed in chart.