Chapter 13 Relay Pumping Operations

Question 1

What is the maximum distance relay method?

Answer 1

A method that involves flowing a predetermined volume of water for the maximum distance that it can be pumped through a particular hose lay

Question 2

All fire department pumpers are rated to flow their maximum volume at:

Answer 2

150 psi (1 000 kPa).

Question 3

All fire department pumpers are rated to flow 70 percent of their maximum volume at:

Answer 3

200 psi (1 350 kPa).

Question 4

All fire department pumpers are rated to flow 50 percent of their maximum volume at:

Answer 4

250 psi (1 700 kPa).

Question 5

A relay pumping operation always begins with the:

Answer 5

source pumper.

Question 6

As a rule, ___ should be used at the source.

Answer 6

the largest capacity pumper

Question 7

If the relay is being supplied from draft, the ___ will have to develop a higher net pump discharge pressure than the other pumpers in the relay.

Answer 7

source pumper.

Question 8

Failure to keep water moving through the pump could result in ___, thus delaying the operation.

Answer 8

loss of prime

Question 9

The relay pumper should be waiting for water with the dump line or discharge ___ and the pump out of gear.

Answer 9

open

Question 10

If the waiting period for receiving water from the source pumper or another relay pumper is only going to be a few minutes, the pump on the waiting pumper may be ___ before receiving the water.

Answer 10

engaged

Question 11

Sometimes the relay can be started, or the hoselines filled, with water from the:

Answer 11

apparatus water tank.

Question 12

It is most desirable to maintain an intake pressure of:

Answer 12

20 to 30 psi (150 kPa to 200 kPa).

Question 13

If the relay pumper is receiving an intake pressure greater than ___, the valve to the dump line on the relay pumper must be adjusted to limit residual pressure to this maximum.

Answer 13

50 psi (350 kPa)

Question 14

When water reaches the attack pumper, the operator should:

Answer 14

bleed air from the line.

Question 15

Once the relay is in operation and the water is moving, all pump operators set their ___ to an appropriate level.

Answer 15

automatic pressure control devices

Question 16

If equipped with the newest and most sensitive pressure governors, the attack pumper should be set in the ___ mode while all others in the relay should be set in the ___ mode.

Answer 16

pressure; RPM

Question 17

If the intake relief valve is readily adjustable, it should be set to discharge at ___ above the static pressure of the water system it is attached to or above discharge pressure of the previous pumper in the relay.

Answer 17

10 psi (70 kPa)

Question 18

At no time should the relief valve be set for a higher amount than the safe working pressure of the:

Answer 18

hose.

Question 19

If the attack pumper is equipped with a readily adjustable intake relief valve, it should be set between ___ to establish a stable operating condition.

Answer 19

50 to 75 psi (350 kPa to 525 kPa)

Question 20

Small variations in pressure are not significant and as long as the intake relay pumper does not drop below 10 psi (70 kPa) or increase above ___, no attempt should be made to maintain exact pressures.

Answer 20

100 psi (700 kPa)

Question 21

Radios must be used ___ so as not to hamper fire fighting activities and efforts to establish water supply.

Answer 21

cautiously

Question 22

When pumpers are within sight of each other:

Answer 22

hand signals can be used.

Question 23

Relay operations should be shut down first from the:

Answer 23

fire scene.

Question 24

Starting with the ___, each operator should slowly decrease the throttle, open the dump line, and take the pump out of gear.

Answer 24

attack pumper