33 Questions
What is the recommended method for cleaning the nozzle?
Soaking in warm water and mild degreaser
What should be checked to ensure there is no obvious damage to the nozzle?
The bumper and teeth
What lubricant should be used for the nozzle per the operating manual?
Dow-Corning #7 lubricant
What should be done if basic nozzle maintenance does not resolve the issue of stiff nozzles and hard-to-move swivels?
Refer to a senior engineer for guidance
What is NOT normal station level maintenance for the nozzle?
Removing and cleaning the ball bearings
What can attract dirt and grit which can interfere with the moving nozzle parts?
Excessive lubricant
How can damaged teeth on the nozzle be replaced?
By removing two allen screws and replacing the damaged tooth ring with a new one
What should be done to loosen and remove any dirt buildup after moving the nozzle in warm water/degreaser mixture?
Open and close the bale
What is used to check that there are no missing or loose teeth on the nozzle?
Visual inspection
What can cause nozzles not to swivel over time?
Dirt and grime gunking up bearings
Which type of nozzles are most engines 2019 and newer equipped with?
Elkhart Chief XD series nozzles
What is the nozzle pressure for smooth bore hand line nozzles designed to be flowed at?
50 PSI
What is the force exerted from the discharge of water out of a nozzle back at the firefighter called?
Reaction
What is the flow target for initial interior residential attack lines?
150 GPM minimum
What is the construction of most Elkhart Chief XD nozzles?
Standard full round ball shutoff construction
What components do (most) Elkhart Chief nozzles come with integrated?
Smooth bore tips
What series of nozzles are carried by CFD?
Elkhart Chief and Chief XD series nozzles
What is the nozzle pressure for combination and automatic nozzles?
$150 PSI at the nozzle$
What is defined as the quantity of water measured in gallons per minute (GPM)?
$Flow$
What does Elkhart Chief XD NOZZLE not have that makes it different from ELKHART CHIEF NOZZLE?
Integrated smooth bore tips
What does Elkhart Chief XD NOZZLE not have that makes it different from ELKHART CHIEF NOZZLE?
Integrated smooth bore tips
What is the Freeman Principle related to?
Selecting a nozzle and hose to maintain the optimal exit velocity of the stream
What is the primary purpose of the Elkhart Brass ST-185Indy Stack- 1 1/8 nozzle?
To allow for easy interchange of tip sizes to achieve the desired GPM
What is the consequence of overpumping a trash line at higher pressures?
Limited benefits and extreme workloads on operating crews
What is the main difference between Full Round Ball shutoff and Double Cut Ball shutoff?
Double Cut Ball shutoff allows the flow of water to assist with opening/closing the nozzle bale, while Full Round Ball creates a smoother discharge orifice
What can be identified by the beveled machined edge on the inner face of the nozzle discharge orifice?
An integrated tip
What does Select-O-Matic Automatic Nozzle's ratio between nozzle pressure and flow indicate?
It indicates an exponential growth regarding nozzle reaction and GPM as pressure is increased
What is the primary purpose of CFD smooth bore nozzles operated at 50 PSI nozzle pressure?
To maintain reach and penetration of the attack stream
What are the repercussions of overpumping or underpumping a hand line?
Limited benefits and extreme workloads on operating crews in both directions
What determines the optimal exit velocity of the stream for fire attack?
Selecting a nozzle and hose to maintain reach and penetration
What does Smooth Bore principle state about nozzle orifice size relative to hose diameter?
The orifice of the nozzle should ideally not be greater than half the diameter of the hose
What does Freeman Principle help in achieving during fire attack?
Ensures adequate reach and penetration needed for fire attack is obtained
What is the primary purpose of Combination nozzles in terms of operation?
To maintain reach and penetration of the attack stream
Test your knowledge of firefighting nozzles with this quiz covering topics such as nozzle types, construction, maintenance, and pressure-flow characteristics. Identify basic CFD nozzles, understand smooth bore tip sizes, and learn about the SM20FLP Select-OMatic nozzle.
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