Ch 12. Relay Pumping Operations

Question 1

The pumper with the largest capacity pump in a relay should be assigned to the water source. This is because the source pumper may have to:

Answer 1

Develop a higher pump discharge pressure in the other pumpers in the relay

Question 2

What are the limiting factors in a pumper relay system?

Answer 2

The overall capacity is limited by the smallest pump in the relay in the smallest diameter hose used in the relay

Question 3

What psi intake pressure should drivers/operators maintain as a relay pumper?

Answer 3

20 to 30 psi

Question 4

What pressure Governor mode should the attack pumper use?

Answer 4

Attack apparatus should be in pressure mode

Question 5

What pressure governor mode should relay pumpers operate in while relaying water?

Answer 5

Rpm mode

Question 6

What is a dump line?

Answer 6

A secured hose line or discharge that is used to handle excess water during relay operations

Question 7

What is a Tender?

Answer 7

A mobile apparatus that has the primary function of supporting another operation. Examples include a water tender that supplies water to pumpers. Some water tenders may carry large diameter hose of more than a mile in length

Question 8

When considering limitations of the hose while increasing discharge pressure, the driver/operator must remember that:

Answer 8

Discharge pressures must not exceed the pressure at which hose or appliances have been tested

Question 9

Addidng some additional pumpers into the relay system will allow:

Answer 9

Allow pumpers to operate at lower pressures in maximum flows within the relay operation

Question 10

When putting a relay into operation, the relay pumpers intake pressure should be maintained at what psi?

Answer 10

20 to 30 psi

Question 11

What device serves an important role in the safety of a relay operation because of the cumulative effect of pressure increases when changes in flow occur?

Answer 11

Pressure governors

Question 12

 When relay pumpers are equipped within adjustable intake relief valve, they should be set to _______ psi above the static pressure of the water system to which it is attached.

Answer 12

10 psi

Question 13

Once a relay is in operation, the driver/operator of the attack pumper should not attempt to correct minor fluctuations as long as the intake pressure does not drop below ______ PSI.

Answer 13

20 psi

Question 14

How should relay operations be shut down?

Answer 14

Starting at the fire scene

Question 15

What is the characteristic of an open relay?

Answer 15

Deploys portable folding drop tanks at each intake for pumpers in the relay operation

Question 16

Why might the open relay method be employed in relay operations?

Answer 16

To provide an alternate water supply system

Question 17

What type of relay requires no adapters or other appliances to connect intake hose is in the system?

Answer 17

Open relay

Question 18

What is a benefit of using the open relay method when operating from portable folding drop tanks?

Answer 18

iliminates pressure surges

Question 19

When relay pumping operation procedures include a predetermined task force, the task force that is dispatched to initiate a relay pumping operation will set up a relay water supply operation:

Answer 19

Independent of the other companies already operating at the same

Question 20

 What might be true about the type of hose diameters local jurisdictions may use to complete really operations?

Answer 20

A variety of hose diameters might be used

Question 21

What devices reduce the possibility of damage to the pump and other water supply components that may be caused by water hammer when valves are operated to quickly or intake pressures rise dramatically?

Answer 21

Pressure relief valves

Question 22

What occurs when intake pressure relief valves are preset to allow a predetermined amount of pressure into the fire pump and incoming pressure exceeds that preset level?

Answer 22

Valves open in dump access pressure/water until water is entering the pump at the correct pressure

Question 23

What is a type of intake pressure relief valve that is often equipped with a gate valve that allows the water supply to the pump to be shut off?

Answer 23

Screw on intake pressure release valve

Question 24

What device on an intake pressure relief valve allows air to bleed off as the incoming supply hose is charged?

Answer 24

Bleeder valve

Question 25

Later arriving pumpers can tie into the relay in boost pressure and volume after it has already started flowing, without interrupting water supply, by using:

Answer 25

In-line relay valves