ULTRA-WIDE PPW Variable Range Proportioners

CHEMGUARD ULTRA-WIDE PPW variable range proportioning systems function by maintaining equal pressures in the foam concentrate and water inlets to the proportioner. This balancing ability and a variable orifice allows the proportioner to be used over a wider range of flows and pressures than standard balanced pressure pump proportioners. The system will also respond quickly and accurately to changes in the water inlet pressures and flow rates.

The system utilizes a positive displacement foam pump to pressurize foam concentrate within the supply manifold. A pressure control valve, located in the return line to the foam concentrate storage tank, is set to maintain a regulated pressure in the supply manifold at a minimum of 15 psi to 30 psi (1 bar to 2 bar) higher than the maximum pressure in the water supply line. Foam concentrate, not required by the proportioner, returns to the atmospheric storage tank through the pressure control valve.

The balancing valve in the proportioner senses the foam concentrate pressure and automatically adjusts to balance it with water pressure. As foam concentrate enters the proportioner, a variable orifice regulates the flow of pressurized foam concentrate entering the water stream.

The units are available in two standard sizes, 6 in. and 8 in., with flow rates from 51 gpm to 4,875 gpm (193 Lpm to 18,450 Lpm) (see System Information Table). Each unit consists of a foam proportioner, pressure balancing valve, and pressure sensing tubing.

The proportioner construction includes a bronze body, stainless steel deflector, stainless steel spring, stainless steel foam metering cone and orifice, and a bronze balancing valve with stainless steel fasteners.

The proportioner is installed between either 6 in. or 8 in. pipe flanges (flat or raised face) corresponding with the proportioner size. To assist with proper installation, the body is marked with arrows to indicate direction of flow for water and foam concentrate. A minimum of 5 nominal diameters of straight pipe is required in the water line upstream of the proportioner, and a minimum 2.5 nominal diameters of straight pipe downstream of the proportioner.

System Information Table

Application

CHEMGUARD ULTRA-WIDE PPW variable range proportioners are part of an in-line balanced proportioning system using an atmospheric foam concentrate tank connected to a positive displacement foam concentrate pump. The proportioner design provides accurate flow control of a foam liquid concentrate stream over a wide range of flow rates and pressures. CHEMGUARD C3B 3% AFFF and CHEMGUARD C334-LV 3x3 AR-AFFF concentrates are the only concentrates approved for use with the proportioners.

Common applications include:

• Flammable liquid storage where protection requires multiple devices with a wide range of flow rates, such as tank farm protection systems per NFPA 11 using foam chambers, or other means of foam delivery where varied flow rates are encountered in addition to low flow requirements for a supplementary foam handline(s).
• Closed head foam-water sprinkler systems for warehouse storage, chemical processing, loading racks, and any location where flammable liquids are used, stored, processed, or transported.

Note: The converted values in this document are provided for dimensional reference only and do not reflect an actual measurement.

CHEMGUARD, ULTRA-WIDE, and the product names listed in this material are marks and/or registered marks. Unauthorized use is strictly prohibited.

Approvals

CHEMGUARD PPW-6 variable range proportioners are UL Listed and FM Approved with both the CHEMGUARD C3B 3% AFFF and CHEMGUARD C334-LV 3x3 AR-AFFF foam concentrates. The CHEMGUARD PPW-8 variable range proportioners are UL Listed with these two foam concentrates.

Note: ULTRA-WIDE PPW-6 proportioners are only FM Approved when used in conjunction with the specific foam concentrates and equipment shown in the Approval Guide (www.ApprovalGuide.com).