Balanced Pressure Pump Proportioning Systems (Pump Skids)


The Balanced Pressure Pump Proportioning System functions by maintaining an equal pressure in the foam concentrate and water inlets to the proportioner, allowing the proportioner to be used over a wide range of flows and pressures. The system connects to an atmospheric storage tank which allows refilling during operation. Controls respond quickly and accurately to changes in the water inlet pressures and flow rates.

The system operates by passing the required portion of foam concentrate from a positive displacement pump to a venturi proportioner with the remaining portion recirculating through a diaphragm valve in the return line to the tank. The diaphragm valve senses and balances the pressure (which can also be balanced manually) in the foam and water lines to the proportioner. The foam concentrate then enters the proportioner where a built-in orifice regulates the flow of pressurized foam concentrate entering the water stream.

These systems are typically used to protect tank farms, marine docks, chemical processing plants, offshore oil platforms, aircraft hangars and loading racks.

The skid units are available in six proportioner sizes ranging from 2 to 8 in. with flow rates from 30 to 5500 gpm (114 to 20,816 Lpm). Each unit consists of a positive displacement foam pump with electric motor and starter; various control, drain, and check valves; pressure balancing diaphragm valve; duplex gauge; foam proportioner; interconnecting brass pipe; and stainless steel valve identification and system instruction nameplates.

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Pump Skids are used in combination with atmospheric storage tanks.

Pump Skids

While foam concentrate is pumped from the tank to the proportioner, an automatic pressure balancing valve matches foam concentrate pressure to water pressure.

Instead of using pressurized water as with bladder tanks, the foam liquid is pumped to the proportioner. An automatic pressure balancing valve regulates the foam concentrate pressure to match the water pressure. A duplex pressure gauge provides continuous monitoring of both water and concentrate pressures. The system can also be operated manually to control the pressures and isolate the automatic balancing valve.

Positive displacement pumps are used with these systems to allow maximum efficiency for liquids of varying viscosity. The size of pumps and drivers will vary depending on the application and the type of foam concentrate used.

Atmospheric Poly Foam Storage Tank

An Atmospheric Foam Concentrate Storage Tank is one component of a foam proportioning system. The high density cross-linked polyethylene (XLPE) storage tanks are compatible with all ANSUL foam concentrates, both synthetic and protein.

Because of the properties of XLPE relating to stress crack resistance, impact strength, light weight and overall toughness, poly tanks are an excellent choice for many foam system applications. An atmospheric concentrate tank is typically used in conjunction with a balanced pressure pump proportioning skid unit or in-line balanced pressure proportioning system. Additionally, similar tanks could be used with a line proportioning system.

The atmospheric poly foam concentrate tanks are supplied with fittings. There are two (2) return fittings provided on all tanks located 180 degrees apart to enable ease and flexibility for piping on site. Either connection can be used as the foam concentrate return with the other return connection having the provided pipe plug installed. The poly tanks are translucent and have a level gauge strip for approximating tank contents.

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  • Documents
  • Additional Information
Document Type  
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Document Name Document Type (A-Z) Language FileName Action
ANSUL Fire Protection for Flammable Liquids Total Solutions (Rev. 01) Brochure/Flyer English F-2013123.pdf View
ANSUL Fire Protection for Flammable Liquids Total Solutions (A4) Brochure/Flyer English F-2013123_A4.pdf View
ANSUL Foam Proportioning Equipment Product Overview (Rev. 01) Brochure/Flyer English F-2013117.pdf View
ANSUL Case Study - Airport Jet Fuel Tank Farm - Washington, DC USA Case Study English F-2013127.pdf View
ANSUL Case Study - Corporate Aircraft Hangars - Philadelphia, PA USA Case Study English F-2013125.pdf View
TARGET-7 Medium-Expansion Foam System for Vapor Suppression of Chlorine Dioxide - Case Study (Rev. 02) Case Study English F-2004132.pdf View
ANSUL Foam Systems Application Case Study - High Expansion Foam for Coal Dust Applications Case Study English F-98206.pdf View
ANSUL Foam Concentrate Transfer Pump Data Sheet (Rev. 01) Data/Specification Sheet English F-2011240.pdf View
Proportioning Test Instruments Data/Specification Sheet English F-2007003.pdf View
ANSUL Foam Systems Flowmax CL Variable Range Proportioner Data Sheet (Rev. 05) Data/Specification Sheet English F-2005165.pdf View
ANSUL Masterfoam Tote-Trailer Equipment Data/Specifications Sheet (Rev. 01) Data/Specification Sheet English F-2001061.pdf View
ANSUL 1½" Pressure Control Valve Diaphragm Data/Specification Sheet (Rev. 01) Data/Specification Sheet English F-94121.pdf View
FWB Foam Eductor Data Sheet Data/Specification Sheet English F-94116.pdf View
Atmospheric Poly Foam Tanks Data Sheet Data/Specification Sheet English F-93215.pdf View
ANSUL Foam Systems MobilCart Data/Specifications Sheet (Rev. 02) Data/Specification Sheet English F-93214.pdf View
ANSUL Proportioning Foam Trailer Models PFT-500, PFT-750, PFT-1000 Data/Specification Sheet (Rev. 01) Data/Specification Sheet English F-91123.pdf View
Balanced Pressure Pump Proportioning Data Sheet Data/Specification Sheet English F-85174.pdf View
ANSUL Foam Systems Threaded Proportioners (2 and 2½ In) Data Sheet (Rev. 14) Data/Specification Sheet English F-85144.pdf View
ANSUL Foam System Flanged Proportioners (3, 4, 6, and 8 in.) Data Sheet (Rev. 11) Data/Specification Sheet English F-85143.pdf View
Around the Pump Proportioning System Data Sheet Data/Specification Sheet English F-9490.pdf View
ANSUL Foam Systems Hydraulic Concentrate Control Valve Data Sheet (Rev. 05) Data/Specification Sheet English F-9197.pdf View
ANSUL Foam Systems In-Line Balanced Pressure Proportioners Models IBP, IBP-M, Data/ Specification Sheet (Rev. 05) Data/Specification Sheet English F-9130.pdf View
ANSUL Foam Systems Line Proportioner Data Sheet (Rev. 05) Data/Specification Sheet English F-8739.pdf View
ANSUL Foam Systems Between Flange Proportioners (3, 4, 6, and 8 Inch) Data Sheet (Rev. 12) Data/Specification Sheet English F-8452.pdf View
Tyco Fire Protection Products National Credit Department Contacts (U.S. Only) (Rev. 03) Dated 4/30/2013 General Information English T-2009103.pdf View
ANSUL Technical Bulletin No. 55 - Aspirated Versus Nonaspirated AFFF (Rev. 02) Technical Bulletins English F-83115.pdf View
ANSUL Technical Bulletin No. 58 - Replacement Components and Service Technical Bulletins English F-8922.pdf View
TYCO Fire Protection Products Flushing Procedure for Fixed Foam Systems, Tanks, and Proportioning Piping Technical Bulletin Technical Bulletins English T-2016251.pdf View
Tyco Fire Protection Products - Flushing Procedure for Fixed Foam Systems, Tanks, and Proportioning Piping Technical Bulletin (A4 Format) Technical Bulletins English T-2016251_A4.pdf View

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