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Primary Boiler Feed Pump, to pump feed water supply.

Emergency Stand by Pump, acting as a reliable back up where a mechanical feed water pump is already fitted to the boiler.

Preheating ‘Make-up’ water, where the water supply pressure exceeds the boiler steam pressure.

Injection of Feed Water Treatment Compounds, in suitable diluted mixtures.


1/2″ to 1 1/2″  (15 – 20mm)


Bronze and Brass.



Size Horsepower Based on Ordinary Tub Boiler Horsepower Based on 30 lb. Water Per HP per Hour Pipe Connection Capacity Per Hour 60 – 110 lb. Steam Pressure.  1′ – 3′ Lift
B.S.P mm Maximum Minimum
Gallons Litres Gallons Litres
A 8 to 16 10 to 20 1/2″ 15 135 614 70 318
AA 12 to 22 15 to 30 1/2″ 15 180 819 100 455
B 17 to 32 22 to 45 3/4″ 20 260 1183 140 637
BB 20 to 45 25 to 60 3/4″ 20 360 1638 180 819
C 40 to 65 45 to 80 1″ 25 475 2161 250 1137
CC 45 to 80 50 to 100 1″ 25 600 2730 325 1478
D 50 to 100 60 to 135 1 1/4″ 32 800 3640 425 1933
DD 75 to 135 85 to 165 1 1/4″ 32 1000 4450 525 2388
E 100 to 180 125 to 235 1 1/2″ 40 1400 6370 740 3367





“Brown” Automatic and Auto-positive injectors are designed and built to give the purchaser a dependable and lasting service. Each individual Injector must pass an actual boiler test before leaving our factory, and in guaranteed faultless; but must be used as we recommend.

If it should be found that a newly fitted Injector is not functioning properly, it is almost certain that the trouble can be traced to the connections. The Injector derives its power through the steam pipe, and its capacity comes through the suction pipe. The suction pipe must deliver sufficient cold water to condense the steam so that they may combine and pass through the small delivery jet. Too much water will allow the Injector to work well at high pressures but stifles its performance at low pressures. Too little, or too hot water may give good results at low pressure, but fail to condense all the steam at high pressures. An indication of shortage of steam or water is often revealed by continued overflow of hot water.



This will depend upon the rate at which the boiler is called upon to evaporate water. The catalogue capacities are based upon 7 1/2 to 8 gallons of water per horsepower per hour, which is equivalent to 60 to 65 pounds per hour. Since the boiler H.P. is defined as the evaporation of 30 to 34 pounds of water per hour, the above allowance is ample for all ordinary conditions. In any event, the Injector should deliver at least 30% more water than is ever being evaporated, so as to provide a reserve capacity. The injector capacity can always be reduced nearly 50% by throttling the water supply line.



  1. Leak in suction pipe or around steam or water supply.
  2. Sediment in the pipes.
  3. Using a stock model Injector at low steam pressure for pressure water supply without substituting a special steam jet.
  4. Failure to regulate water supply properly at low steam pressures.
  5. Using an Injector unsuited to the conditions.
  6. Water supply choked (loose hose lining, strainer fouled, foot valve stuck).
  7. Discharge line choked (Pipes lined up).
  8. Steam line not bringing in enough power.
  9. Water supply too hot.
  10. Injector overheated from leaky steam valve or discharge line checked.

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