Chapter 12 - Relay Pumping Operations Flashcards
Which of the following should be the first apparatus discontinued when relay operations are no longer needed?
Pumpers at the fire scene
page 434
The pumper that takes water from a hydrant or static source at the beginning of a relay operation is the:
water supply pumper
page 426
During relay pumping operations the attack pumper driver/operator should expect ____ variations in pressure.
small
page 434
Which of the following relay methods requires no adapters or other appliances to connect intake hoses in the system?
Open relay
page 435
What is placed along the length of a supply hose and permits a pumper to connect to it to boost pressure in the hose?
Inline relay valve
page 436
The pumper that receives water from the source pumper, raises the pressure, and then supplies water to the next apparatus is the:
relay pumper
When would a discharge manifold be used to break down the large diameter hose (LDH) into two or more hoselines that may then be connected to different pumpers?
During LDH relay operations that must supply more than one attack pumper
page 436
In relay operations, elevation pressure is not affected by the amount of water being moved, only by the:
topography
page 436
Which pumper takes water from a hydrant or static source at the beginning of a relay operation?
Water supply pumper
Which is an advantage when operating in an open relay(dump tanks)?
Eliminates pressure surges and inconsistent supply
When shutting down the relay, beginning with the attack pumper and coordinating with other pumpers in the relay, each driver/operator should:
slowly decrease the throttle and open the dump line valve
When medium diameter hose (MDH) is used in relay operations, generally:
multiple hoselines are laid
When the source and relay pumpers are ready, the discharge supplying the hoseline on the source pumper is _____ while the valve on the dump line is _________.
opened
closed
When need for relay pumping has ended, the operation should be discontinued from the _________ first
fire scene
Attack pumpers equipped with an adjustable intake relief valve should be set:
between 50 and 75 psi to establish a stable operating condition
page 434
When relay pumpers are equipped with an adjustable intake relief valve, one guideline is that it should be set to:
10 psi above the discharge pressure of the previous pumper in the relay
The driver/operator of the attack pumper should not attempt to correct minor fluctuations as long as the intake pressure does not drop below
20 psi
page 434
Placing additional pumpers in the system will increase flow during a relay operation because it shortens the length of hose each pumper must supply and allows pumpers to:
operate at lower pressures and maximum flows within the relay operation
When relaying long distances, spacing between pumpers should be:
equalized as much as possible
page 432
Centrifugal pumps are rated to pump at their maximum volume capacity at _____ at draft
150 psi
In a relay operation, which pumper receives water from the source pumper, raises the pressure, and supplies water to the next apparatus?
Relay pumper
As a relay pumper, it is advisable for driver/operators to maintain an intake pressure of:
20 to 30 psi
Which valves allow later arriving pumpers to tie into the relay and boost pressure and volume after it has already started flowing, without interrupting the water supply?
Inline relay valves