Hale MG User Manual download pdf (Page 40)

Muscle Pumps

2-6

TPM (if available) very low in order to limit the

incoming pump pressure by dumping water on the

ground before you have discharge hose lines

connected and are flowing water. Then, as you are

able to use the incoming water, the relief valve

control can be moved up to the desired operating

pressure and set as instructed. This technique will

also help you to purge the air from the incoming

hose and the pump before it can get to a

dangerously high pressure.

Use this procedure after the hose is laid, the

apparatus are in position, and the pumps are

engaged. See the “Pumping from a Hydrant”

procedure for setup and engagement instructions

for apparatus receiving pressurized water.

1. Open two discharge gates on all pumps, except

on the pump at the source, to get rid of air

from hose lines and pumps.

2. On each pump, attach the hose lines to one of

the discharges, and leave the other discharge

uncapped (only for trucks without a relay

valve).

3. Watch the intake gauge for a high-pressure

reading. If this is reached, open the gate

controlling the uncapped discharge to remove

excess water.

4. Supply the pump at the water source with

water; prime if necessary. The discharge

pressure must not be over 150 PSI (10 BAR)

or the maximum pressure rating of the relay

hose to start water moving. Use either the

“Pumping From Hydrant” or “Pumping From

Draft” procedures that appear earlier in this

section.

5. When the water reaches the second pump,

close the uncapped discharge gate. Repeat this

step for all pumps until the water reaches the

fire ground.

6. Adjust the throttle on the pump at the water

source for the required operating pressure.

Watch the gauges to avoid cavitation. (The

pump operator at the fire scene will advise all

other pump operators of the amount of water

needed at the fire ground).

7. Adjust the discharge pressure or flow at the

fire scene to supply the lines being used.

8. Observe the gauges carefully, and adjust the

pressure or flow as needed.

9. Shutdown starts from the fire ground pump

and works toward the water source. Gradually

reduce pressure at the fire ground pump until

you can disengage it. Follow this procedure for

every pump in the relay until the pump at the

water source is shut down.

LOCAL TRAINING PROCEDURES MAY

VARY SLIGHTLY FROM ABOVE.

Tandem Pumping Operation From a

Hydrant

1. Using the large intake hose, connect the first

pumper to the hydrant steamer. Open the

hydrant until the pump is primed, then partially

close the hydrant.

2. Position the second pumper intake-to-intake

with the first pumper.

3. Open a discharge to flow water.

4. With the hydrant partially closed, adjust the

throttle on the first pumper until the intake

gauge reads about 5 PSI (.5 BAR)

5. Remove the unused intake cap.

6. Connect the second pumper to the unused

steamer intake of the first pumper, using a

large intake hose.

7. Open the hydrant completely. Both pumpers

pump water to the fire, (refer to the procedure

on “Pumping From a Hydrant”).

LOCAL TRAINING PROCEDURES MAY VARY

FROM ABOVE.

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