Chap.13 Ifsta Pumping Apparatus Driver/operator 2Nd Edition

Front 1

That pumper connected to the water supply at the beginning of the relay operation, and should be the engine with the largest pump capacity.

Back 1

Source Pumper (supply pumper)

Front 2

Pumper or pumpers connected within the relay that recives water form the source pumper or another relay pumper, boosts the pressure, and then supplies water to the next appararus in the relay.

Back 2

Relay pumper (In-line Pumper)

Front 3

Engine or other pumping apparatus located at the fire scene that will be recieving water from the relay and supplying atack lines and appliances as needed for fire suppression.

Back 3

Attack Pumper

Front 4

Large diameter hose ranges in what sizes? What are the most common sizes?

Back 4

3-12 inches with 4" and 5" being the most common

Front 5

These valves are intended to enhance firefighter safety and reduce the possibility of damge to the pump and discharge hoselinescaused by water hammer when valves are closed too quickly or intake pressures otherwise rise dramatically.

Back 5

Intake Pressure Relief Valves, also called Relay Relief Valves

Front 6

Pumpers with adjustable intake relief valves should be adjusted so that they are set to what?

Back 6

Within 10psi of the static pressure of the water supply system or 10psi above the discharge pressure of the previous pumper in the relay.

Front 7

In the most basic sense, a relauy operation is based on what two things?

Back 7

- The amount of wate required at the emergency scene.
- The distance from the emergency scene to the water source.

Front 8

If it is desirable to increase the amount of water flow through a relay, one of what three things can be done?

Back 8

-Increase the size of the hose or number of hoselines used in the relay.
- Increase the pump discharge pressure of the pumpers operating in the relay.
- Increase the number of pumpers in the relay.

Front 9

Where should the largest hose in the relay be laid?

Back 9

At the begining of the operation

Front 10

If departments purchase hose that are designed for higher standard pressures, the hiose should not be pumped at pressures that exceed what?

Back 10

90% of the anual service test pressure

Front 11

What are the two basic designs for relay pumping operations?

Back 11

- Maximum Distance Relay Method
- Constant Pressure Relay method

Front 12

Relay method that involves flowing a predetermined volume of water for the maximum distance that it can be pumped through a particular hoselay.

Back 12

Maximum Distance Relay Method

Front 13

Pumpers are rated to flow their maximum volume at ___psi, 70% at ___psi, and 50% at ___psi.

Back 13

150 psi; 200 psi; 250 psi

Front 14

The relay method that provides the maximum flow available from a particular relay setup by using a constant pressure in the system.

Back 14

Constant Pressure Relay Method

Front 15

What are several advantages in using constant pressure relay?

Back 15

- It speeds relay activation.
- It requires no complicated calculations
- Radio traffic and confusion between pump operators are reduced.
-The attack pumper driver operator is able to govern fire lines easier.
- Operators in the relay only have to guide and adjust pressure to one constant figure.

Front 16

In relay operations, as a rule, the largest capacity pumper should be used where?

Back 16

At the source

Front 17

In relay operations it is most desirable to maintain an intake pressure of what?

Back 17

20-30 psi

Front 18

if a relay pumper is recieving an intake pressure greater than 50 psi, what should be done?

Back 18

The valve to the jumpline should be adjusted to limit the residual pressure to 50psi.

Front 19

What device is essential when operating in a relay due to the cumulative nature of pressure increases when changes in flow occur.

Back 19

Automatic Pressure Control Device

Front 20

If an attack pumper is equipped with a readily adjustableintake relief valve, set it between __-__psi to establish a stable operating condition.

Back 20

50-75psi

Front 21

In relay operations as long as pressures do not drop below __psi or above ___psi no action should be required.

Back 21

10psi ; 100psi

Front 22

With all the activity on the fire scene, too much radio traffic when setting up a relay can interfere with fireground comunications. What are two other options instead of radio use?

Back 22

- When pumpers are within sight of each other, hand signals can be used.
- In extreme cases, messengers on foot can still be effective.