Chapter 12 - Relay Pumping Operations

Question 1

Which of the following should be the first apparatus discontinued when relay operations are no longer needed?

Answer 1

Pumpers at the fire scene

page 434

Question 2

The pumper that takes water from a hydrant or static source at the beginning of a relay operation is the:

Answer 2

water supply pumper

page 426

Question 3

During relay pumping operations the attack pumper driver/operator should expect ____ variations in pressure.

Answer 3

small

page 434

Question 4

Which of the following relay methods requires no adapters or other appliances to connect intake hoses in the system?

Answer 4

Open relay

page 435

Question 5

What is placed along the length of a supply hose and permits a pumper to connect to it to boost pressure in the hose?

Answer 5

Inline relay valve

page 436

Question 6

The pumper that receives water from the source pumper, raises the pressure, and then supplies water to the next apparatus is the:

Answer 6

relay pumper

Question 7

When would a discharge manifold be used to break down the large diameter hose (LDH) into two or more hoselines that may then be connected to different pumpers?

Answer 7

During LDH relay operations that must supply more than one attack pumper

page 436

Question 8

In relay operations, elevation pressure is not affected by the amount of water being moved, only by the:

Answer 8

topography

page 436

Question 9

Which pumper takes water from a hydrant or static source at the beginning of a relay operation?

Answer 9

Water supply pumper

Question 10

Which is an advantage when operating in an open relay(dump tanks)?

Answer 10

Eliminates pressure surges and inconsistent supply

Question 11

When shutting down the relay, beginning with the attack pumper and coordinating with other pumpers in the relay, each driver/operator should:

Answer 11

slowly decrease the throttle and open the dump line valve

Question 12

When medium diameter hose (MDH) is used in relay operations, generally:

Answer 12

multiple hoselines are laid

Question 13

When the source and relay pumpers are ready, the discharge supplying the hoseline on the source pumper is _____ while the valve on the dump line is _________.

Answer 13

opened

closed

Question 14

When need for relay pumping has ended, the operation should be discontinued from the _________ first

Answer 14

fire scene

Question 15

Attack pumpers equipped with an adjustable intake relief valve should be set:

Answer 15

between 50 and 75 psi to establish a stable operating condition

page 434

Question 16

When relay pumpers are equipped with an adjustable intake relief valve, one guideline is that it should be set to:

Answer 16

10 psi above the discharge pressure of the previous pumper in the relay

Question 17

The driver/operator of the attack pumper should not attempt to correct minor fluctuations as long as the intake pressure does not drop below

Answer 17

20 psi

page 434

Question 18

Placing additional pumpers in the system will increase flow during a relay operation because it shortens the length of hose each pumper must supply and allows pumpers to:

Answer 18

operate at lower pressures and maximum flows within the relay operation

Question 19

When relaying long distances, spacing between pumpers should be:

Answer 19

equalized as much as possible

page 432

Question 20

Centrifugal pumps are rated to pump at their maximum volume capacity at _____ at draft

Answer 20

150 psi

Question 21

In a relay operation, which pumper receives water from the source pumper, raises the pressure, and supplies water to the next apparatus?

Answer 21

Relay pumper

Question 22

As a relay pumper, it is advisable for driver/operators to maintain an intake pressure of:

Answer 22

20 to 30 psi

Question 23

Which valves allow later arriving pumpers to tie into the relay and boost pressure and volume after it has already started flowing, without interrupting the water supply?

Answer 23

Inline relay valves