Chapter 12 - Relay Pumping Operations

Question 1

• Using two or more pumpers to move water over a long distance by operating them in series; water discharged from one pumper flows through hoses to the inlet of the next pumper and so on.

Answer 1

Relay Operation ( also known as Relay Pumping )

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Question 2

• Pumper that takes water from a hydrant or static source and pumps under pressure to the next apparatus in the relay pumping operation.

Answer 2

Water supply pumper

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Question 3

Water supply pumpers should be the apparatus with the largest ?

Answer 3

pumping capacity

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Question 4

Some jurisdictions refer to water supply pumpers as ?

Answer 4

source pumpers

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Question 5

• Pumper or pumpers connected within the relay that receive water from the source pumper or another relay pumper, raises the pressure, and then supplies water to the next apparatus.

Answer 5

Relay pumper

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Question 6

• Pumping apparatus located at the fire scene that receives water from the relay and is responsible for supplying the attack lines and appliances required for fire suppression.

Answer 6

Fire attack pumper

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Question 7

Some fire departments, especially those that have occasion to make many long hose lays, employ hose _________ to assist in relay pumping operations.

Answer 7

tenders

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Question 8

• Term used within the Incident Command System for a mobile piece of apparatus that has the primary function of supporting another operation.

Answer 8

Tender
ex. Water tender or fuel tender

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Question 9

It is possible for a hose tender to carry a mile or more of ?

Answer 9

large diameter hose (LDH)

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Question 10

• Relay supply hose of 3 1/2 to 6 inches in diameter; used to move large volumes of water quickly with a minimum number of pumpers and personnel.

Answer 10

Large Diameter Hose (LDH)

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Question 11

Basically the need for relay pumping is determined by the amount of ________ required at an incident and the __________ between the incident scene and the water source.

Answer 11

water / distance

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Question 12

If the amount of flow through a relay operation needs to be increased, depending on the size of the supply hose and fire flow requirements, at least one of three conditions must be met:

• The ___________ of the supply hose or the _________ of hoselines must be increased.
• The pump __________ __________ of the pumpers involved in the relay must be increased.
• More __________ must be added to the relay to overcome friction loss or elevation.

Answer 12

• diameter / number
• discharge pressure
• pumpers

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Question 13

True or False:

If pumpers in the relay operation increase their pump discharge pressure, the volume of water through the system will always increase ?

Answer 13

False

this action will not necessarily increase the volume of water

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Question 14

Centrifugal pumps are rated to pump at their maximum volume capacity at ______ psi at draft. When pumping at pressures higher than _____ psi, the volume capability of the pump is reduced proportionately.

Answer 14

150 / 150

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Question 15

At no time should discharge pressures exceed the pressure at which hose or appliances have been ?

Answer 15

service tested

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Question 16

Elevation pressure is not affected by the amount of water being moved only by the ____________.

Answer 16

topography

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Question 17

Increasing flow during a relay operation may be accomplished by placing ?

Answer 17

additional pumpers in the system

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Question 18

Relay operations may use ______ to supply a low flow rate where the distance between each pumper exceeds the length of supply hose carried on each pumper.

Answer 18

LDH

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Question 19

Fire department pumpers are rated to flow their maximum volume at 150 psi, ____ percent of their maximum at 200 psi, and ____ percent of their maximum at 250 psi at draft.

Answer 19

70 / 50

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Question 20

When relaying long distances, the hose lays between each pumper should be as ?

Answer 20

equalized as possible

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Question 21

A relay pumping operation begins with the ________ ________ pumper working from the water source.

Answer 21

largest capacity

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Question 22

The source pumper does not have the __________ pressure at the intake that the relay pumpers receive that aids in preventing cavitation.

Answer 22

residual

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Question 23

For their own safety and the efficient operation of the system, all personnel involved in the relay operation must understand that the overall capacity of the system is determined by the ________ pump and the _________ diameter of hose used in the relay.

Answer 23

smallest / smallest

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Question 24

Once water supply has been established, the source pumper should open a __________ or allow water to discharge through a ______ ______ until the first relay pumper is ready for water.

Answer 24

discharge / dump line

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Question 25

The relay pumper should be waiting for water with a _____ ______ or __________ open and the pump out of ______.

Answer 25

dump line / discharge / gear

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Question 26

When the source and relay pumpers are ready, the __________ supplying the hose line on the source pumper is opened while the valve on the ______ ______ is closed in a coordinated action.

Answer 26

discharge / dump line

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Question 27

• Secured hoseline that is used to handle excess water during a relay operation.

Answer 27

Dump Line

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Question 28

It is advisable for the D/O to maintain an intake pressure of ____ to ____ psi as a relay pumper.

Answer 28

20 to 30 psi

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Question 29

As water begins to reach each pumper, the D/O should _____ any air from the line before opening the intake valve.

Answer 29

bleed

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Question 30

• Process of releasing a liquid or gas under pressure, such as releasing air from the regulator or cylinder of a SCBA; or allowing air to escape from a hoseline before or during operations.

Answer 30

Bleed

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Question 31

Once the relay operation is flowing water at the desired pressure, the D/O of the attack pumper should set the __________ ___________ at an appropriate level.

Answer 31

pressure governor

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Question 32

Apparatus equipped with pressure governors should be set in the _________ mode when acting as the attack pumper and in the _____ mode while working as a relay pumper.

Answer 32

pressure / rpm

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Question 33

For relay pumpers equipped with an adjustable intake relief valve, they should be set to ____ psi above the static pressure of the water supply system to which it is attached or ____ psi above the discharge pressure of the previous pumper in the relay.

Answer 33

10 / 10

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Question 34

Attack pumpers equipped with an adjustable intake relief valve should be set between ____ and ____ psi to establish a stable operating condition.

Answer 34

50 and 75 psi

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Question 35

The D/O of the attack pumper should expect small variations in __________ during relay pumping operations. You should not attempt to correct minor fluctuations as long as the intake pressure does not drop below ____ psi.

Answer 35

pressure / 20 psi

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Question 36

During long relay operations smaller capacity pumps may require higher _________ pressure as the relay operation stabilizes.

Answer 36

residual

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Question 37

Like all fireground operations, relay pumping requires the use of effective, clear _____________ for success.

Answer 37

communication

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Question 38

When the need for relay pumping has ended, the operation should be discontinued from the ______ _______ first.

Answer 38

fire scene

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Question 39

During relay pumping operations, the ______ _______ method may be employed to provide an alternate water supply system.

Answer 39

open relay

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Question 40

Open relay method

This method consist of deploying __________ ________ ______ tanks at each intake for pumpers in the relay operation.

Answer 40

portable folding drop tanks

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Question 41

Operating from portable folding drop tanks eliminates the __________ ______ and inconsistent ________ sometimes found in closed relays.

Answer 41

pressure surges / supply

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Question 42

Open relay method:

Additionally, this method requires no _________ or other ___________ to connect intake hoses in the system.

Answer 42

adapters / appliances

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Question 43

Closed relay method:

When using medium diameter hose, 2 1/2 or 3 inches in diameter, generally _________ hoselines are laid. Large diameter hose, 4 or 5 inches in diameter, often requires only _____ supply line to meet fireground requirements.

Answer 43

multiple / one

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Question 44

Closed relay method

D/O should refer to NFPA ______ for information regarding the placement of relief devices.

Answer 44

1962

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Question 45

There are two basic types of intake pressure relief valves. One type, supplied by the pump manufacturer, is an integral part of the pump ________ ___________. The second type is an add-on device that is screwed onto the pump ________ connection.

Answer 45

intake manifold / intake

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Question 46

Many of the screw-on intake pressure relief valves are also equipped with a gate valve that allows the water supply to the pump to be ?

Answer 46

shut off

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Question 47

Relay pumping operations that require the use of later arriving companies to achieve the required flow can set up an initial operation of lesser volume and greater spacing with _______ _______ valves placed in the relay line awaiting the arrival of incoming pumpers.

Answer 47

inline relay valves

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Question 48

An _______ _______ valve is placed along the length of a supply hose that permits a pumper to connect to the valve to boost pressure in the hose.

Answer 48

inline relay

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Question 49

During LDH relay operations that must supply more than one attack pumper, a _________ _________ may be used to break down the LDH into two or more hoselines that may then be connected to different pumpers.

Answer 49

discharge manifold

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