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BALANCED-PRESSURE PROPORTIONER [1 record]

Record 1 2010-04-06

English

Subject field(s)
  • Fire-Fighting and Rescue Equipment
  • Extinguishing Agents
DEF

A type of foam concentrate proportioning system in which a pump and appropriate devices feed the concentrate to a metering orifice or controller at the same pressure as that of the water supply.

CONT

Balanced pressure proportioner: The use of a separate pump for transporting and pressurizing foam concentrate to be delivered in the correct proportions to a flowing water stream offers the greatest advantage for reliable and accurate operation of a foam concentrate proportioning system which must function at varying rates of volume or pressure during its use. ... The balanced pressure system ... relies on: (1) a hydraulically monitored pressure control valve in a bypass foam concentrate line from a pump, and (2) a correctly sized venturi-type proportioning controller in the water line for correct and automatic proportioning over wide ranges of flow.

CONT

Balanced-pressure proportioners and around-the-pump proportioners are both systems that are built into the apparatus fire pump. Apparatus equipped with a balanced-pressure proportioner have a foam concentration line connected to each discharge outlets. This line is supplied by a foam concentrate pump separate from the main fire pump. The foam concentrate pumps draws the concentrate from a fixed tank on the apparatus. This pump is designed to supply foam concentrate to a desired outlet at the same pressure at which the fire pump is supplyng water to that discharge.

French

Domaine(s)
  • Matériel de secours et de lutte (incendies)
  • Agents extincteurs
OBS

proportionneur à pression équilibrée; injecteur à pression équilibrée : propositions confirmées par le Centre de secours de l'Association nationale des sapeurs pompiers volontaires, en France.

Spanish

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