Pumps Chapter 12 - Relay Pumping
Operations UPDATED ACTUAL Exam
Questions and CORRECT Answers
What is a Relay Operation? - CORRECT ANSWER - Using two or more pumpers to move
water over a long distance by operating them in series.
What units are used in a Relay Pumping Operation? - CORRECT ANSWER - Source pumper,
Relay Pumper, Attack pumper and Hose tenders.
What is a Water Supply Pumper (source pumper)? - CORRECT ANSWER - The pumper
connected to the water supply at the beginning of the relay operation, Engine with the largest
pumping capacity, Pumps water to next apparatus in line.
What is the Relay (In-line) Pumper? - CORRECT ANSWER - Pumper connected within relay
that receives water from source pumper or another relay pumper, raises the pressure and supplies
water to next apparatus.
What is the Fire Attack Pumper? - CORRECT ANSWER - 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.
What is a Hose Tender? - CORRECT ANSWER - Apparatus that may assist in long hose lays
associated with relay pumping operations., may be equipped with fire pump that allows them to
participate in pumping operation.
How much large diameter hose (100mm or longer) does a hose tender usually carry? -
CORRECT ANSWER - 1.6km
What appliances may assist with relay pumping operations? - CORRECT ANSWER - Large
Diameter Hose, Intake Pressure Relief Valves, Bleeder Valves, In-line Relay Valves, Discharge
Manifold
, What are Intake Pressure Relief Valves? - CORRECT ANSWER - Used to reduce possibility
of damage to pump and discharge hoselines caused by water hammer.
If the incoming pressure exceeds preset level on an intake pressure relief valve what will it do? -
CORRECT ANSWER - The valve dumps excess pressure/water until the water entering the
pump is at the preset level.
What is the function of Bleeder Valves on intake pressure relief valve? - CORRECT
ANSWER - Allow air to be bled off as the incoming supply hose is charged.
What is the function of In-line relay valves? - CORRECT ANSWER - Allow late arriving
pumpers to hook up after the relay is operating and boost the pressure without interrupting relay
operation.
What is a Discharge Manifold used for? - CORRECT ANSWER - Used if a LDH relay
pumping operation is intended to support more than one attack pumper at the fire scene.
How is Discharge Manifold used? - CORRECT ANSWER - Breaks LDH into two or more
hoselines that may be then connected to attack pumpers.
What are the two operational considerations for relay pumping? - CORRECT ANSWER -
Amount of water required and Distance from emergency scene to water source.
The longer the hose lay, the more _______ will be encountered. - CORRECT ANSWER -
Friction Loss
What are 3 ways you can increase the amount of flow in a relay? - CORRECT ANSWER -
Increase size/number of hoselines, Increase pump discharge pressure, Increase number of
pumpers in relay.
Operations UPDATED ACTUAL Exam
Questions and CORRECT Answers
What is a Relay Operation? - CORRECT ANSWER - Using two or more pumpers to move
water over a long distance by operating them in series.
What units are used in a Relay Pumping Operation? - CORRECT ANSWER - Source pumper,
Relay Pumper, Attack pumper and Hose tenders.
What is a Water Supply Pumper (source pumper)? - CORRECT ANSWER - The pumper
connected to the water supply at the beginning of the relay operation, Engine with the largest
pumping capacity, Pumps water to next apparatus in line.
What is the Relay (In-line) Pumper? - CORRECT ANSWER - Pumper connected within relay
that receives water from source pumper or another relay pumper, raises the pressure and supplies
water to next apparatus.
What is the Fire Attack Pumper? - CORRECT ANSWER - 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.
What is a Hose Tender? - CORRECT ANSWER - Apparatus that may assist in long hose lays
associated with relay pumping operations., may be equipped with fire pump that allows them to
participate in pumping operation.
How much large diameter hose (100mm or longer) does a hose tender usually carry? -
CORRECT ANSWER - 1.6km
What appliances may assist with relay pumping operations? - CORRECT ANSWER - Large
Diameter Hose, Intake Pressure Relief Valves, Bleeder Valves, In-line Relay Valves, Discharge
Manifold
, What are Intake Pressure Relief Valves? - CORRECT ANSWER - Used to reduce possibility
of damage to pump and discharge hoselines caused by water hammer.
If the incoming pressure exceeds preset level on an intake pressure relief valve what will it do? -
CORRECT ANSWER - The valve dumps excess pressure/water until the water entering the
pump is at the preset level.
What is the function of Bleeder Valves on intake pressure relief valve? - CORRECT
ANSWER - Allow air to be bled off as the incoming supply hose is charged.
What is the function of In-line relay valves? - CORRECT ANSWER - Allow late arriving
pumpers to hook up after the relay is operating and boost the pressure without interrupting relay
operation.
What is a Discharge Manifold used for? - CORRECT ANSWER - Used if a LDH relay
pumping operation is intended to support more than one attack pumper at the fire scene.
How is Discharge Manifold used? - CORRECT ANSWER - Breaks LDH into two or more
hoselines that may be then connected to attack pumpers.
What are the two operational considerations for relay pumping? - CORRECT ANSWER -
Amount of water required and Distance from emergency scene to water source.
The longer the hose lay, the more _______ will be encountered. - CORRECT ANSWER -
Friction Loss
What are 3 ways you can increase the amount of flow in a relay? - CORRECT ANSWER -
Increase size/number of hoselines, Increase pump discharge pressure, Increase number of
pumpers in relay.
