Towing Motor-driven pump

The towing motor-driven pump (MPR) is a device used by the firemen. It is about a Pompe provided with its clean spark-ignition Engine, and placed on a trailer.

Uses

The MPR is especially used in rural environment, where the water provision is difficult and where the disasters require great quantities of them.

Pumping

Pumping in water levels (swimming pools, River S, pond S, Lake S,…) constitute its original role. Suction pipes are coupled with the entry of the pump housing, with at their immersed end a Crépine.

They measure seldom more than four meters, and are immersed with the more 80-100cm of depth, if possible the strainer vis-a-vis the current. A cord is attached to the valve for draining and another is attached around the air-holes to retain them and guide them.

Those are rigid because of the risk of suction of a flexible tube when the Pression, caused inside by a too important flow, becomes lower than the Atmospheric pressure.

At the exit of the pump housing flexible tubes are coupled, either in food towards machines, or directly in repression towards lances.

Relay

The motor-driven pumps are also used to increase the pressure during a transport of water at long distances. Indeed because of the pressure losses it is necessary to place pumps at regular intervals on these establishments. It also sometimes happens to pump starting from a Poteau sets fire to.

In this case are coupled directly the flexible feeder pipes with the entry of the pump housing, provided with a reversed division. It is thus advisable to pay great attention to the flow of exit, and consequently to the pressure of entry: this one should never be lower than the atmospheric pressure, under penalty of seeing the pipe subsiding and being aspired in the pump housing, causing him major damage. One generally envisages a margin of 2 bar S.

It happens that a basin of relay is placed before the entry of the pump housing. This one, of a capacity of a few thousands of liters, fills by the feeder pipes, and one pumps in this basin as on a water level. Thus, one can pump with the maximum flow authorized by the air-holes connecting the basin to the pump, with the risk to empty the basin, but while having eliminated the risk of suction.

At the exit of the pump housing flexible tubes are coupled, either in food towards machines, or in food for the continuation of transport out of relay, or directly in repression towards lances.

Specifications

The MPR consists of a pump centrifuges hydraulic coupled to a thermal engine. It is thus entirely autonomous.

In France

There exist three types of MPR, each one being different by its hydraulic performances:

first is MPR 60 which outputs 1000 L/min under a pressure from 10 to 15 bars;
under the same pressures, the MPR 90 of 1 500 L/min of power;
the last is the MPR 120 which has a flow of 2 000 liters under 15 bars of pressure.

In Switzerland

There exist four types of MPR, simply called motor-driven pump and classified by their minimal flow.

Standard I: at least 400 l/min with 4 Standard bar EMT
II: at least 1400 l/min with 8 Standard bar EMT
III: at least 2800 l/min with 8 Standard bar EMT
IV: at least 3200 l/min with 8 bar EMT

Total Manometric Rise (EMT) is the sum of the absolute values of the pressures indicated by the Manovacuomètre and the Manomètre.

External bonds

motor-driven pumps of firm CTD Pulverization
motor-driven pumps, strainers and air-holes of the firm Vogt
range of motor-driven pump high pressure KIPOR

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