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33 Cards in this Set

  • Front
  • Back

Most commonly, driver operators and fire department Pumpers lay the supply hose and participate in the_______ ______.

, relay operation

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

Water Supply Pumper

Water supply Pumpers should be the apparatus with the _______pumping capacity.


Using two or more Pumpers to move water over a long distance, water discharge from one pumper flows through hoses to the inlet of the next Pumper and so on.

Relay operation

A water supply pumper is also known as a_______ Pumper.


Pumper or Pumpers connected with in the relay that receive water from the source pumper or another relay pumper, raises the pressure, and then supplies water to the next apparatus.

Relay Pumper

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

Fire attack Pumper

Term used within the incident command system for mobile piece of apparatus that has the primary function of supporting another operation ; examples include a water tender that supplies water to Pumpers or a fuel tanker that supplies fuel to other vehicles


Relay supply hose of 3 inch to 6 inches in diameter; used to move large volumes of water quickly with a minimum number of Pumpers and personnel

Large-diameter hose for LDH

The need for a relay operation is based on what factors?

Amount of water required and the

Distance between the incident scene and the water source

The amount of water required will have a_________ impact on the design of the relay system.


The_________ of the relay is the second important.


_________ _________ is directly affected by the amount of water being flowed, the diameter of the hose, and the distance between Pumpers

Friction loss

When pumping at pressures higher than_________ PSI the volume capability of the pump is reduced proportionately.


___________ _________ is not affected by the amount of water being moved, only by the topography.

Elevation pressure

Increasing flow during a relay operation may be accomplished by placing additional_________ in the system.


Adding Pumpers to a relay operation will shorten the length of hose each Pumper must supply and allow Pumpers to operate_________ pressures and maximum flows within the relay operation.


What are the percentages that a Pumper rated to flow at 150 psi, 200 PSI and 250 psi

Maximum volume, 70% and 50 %

Total number of Pumpers formula

When relaying long distances, the hose Lays between each Pumpers should be as_________ as possible.


A relay pumping operation begins with the largest capacity pumper working from the_________ _________.

Water source

The overall capacity of a relay system is determined by the smallest_________ and smallest_________ hose used in the relay.

Pump and diameter

Relay Pumpers should be waiting for water with a_________ _________ or discharge open in the pump out of gear.

Dump line

Secured hose line that is used to handle excess water during a relay operation.

Dump line

The relay pumper May engage the pump before recieving water from the Water Source if water is circulated from the onboard tank through the pump, or if the delay in receiving water from the source pump is _________


It is advisable for driver operators to maintain an intake pressure of_________ to_________ PSI as a relay Pumper.

20 to 30

Process of releasing a liquid or gas Under Pressure, such as releasing air from the regulator or cylinder of a self-contained breathing apparatus, or allowing air to escape from a hose line before or during operations.


For relay Pumpers equipped with an adjustable intake relief valve, they should be set to_________ PS I above the static pressure of the water system to which it is attached or 10 psi above the discharge pressure of the previous pumper in the relay.


Attack Pumpers equipped with an adjustable intake valve should be set between_________ and_________ PSI to establish a stable operating condition.

50 and 75

You should not attempt to correct minor fluctuations as long as the initial pressure does not drop below_________ PSI.


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


Like all fire ground operations, relay pumping requires the use of effective, clear_________ for success.


When the need for Relay pumping has ended, the operation should be discontinued from the_________ _________ first.

Fire scene