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Intake
Relief Valve
A device used on the
inlet side of the pump to
relieve excessive inlet
pressure. This valve can be
an integral part of the pump
or part of a large diameter
intake valve mounted to the
inlet.
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Jump Line
A handline stored in an
extended bumper (also called
a jump bumper) and
pre-connected to the engine
to allow for a quicker
attack.
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Ladder
Company
Also
known as a truck company. A
ladder company is a
combination of a ladder
truck and the manpower used
to staff it. A
standard ladder company will
include an officer,
driver/engineer and four
firefighters on a ladder
truck.
Ladder Truck
The ladder truck is
referred to as such because
of its ability to carry a
full compliment of ground
ladders as well as contains
either a telescoping ladder
or a platform.
Large Diameter Hose
The biggest hose
used by firefighters, large
diameter hose (LDH) is
sometimes referred to as a
water main above ground. LDH
is usually 4-5 inches in
diameter and is used to
supply water from the
hydrant to pumper
trucks. See also supply
hose.
Lay
Bed
The hose bed that holds
the main supply line that
will be laid from the
hydrant to the fire scene.
Leader Line
A line usually
having a gated wye on the
end. Leader lines are
usually 3 or 2.5 inches in
diameter and the wye usually
fees two or three 1.5 or
1.75 inch attack lines.
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Master Stream
A large and fixed stream of
water. Master streams are
used on the end of aerial
ladders on ladder trucks and
on top of pumper trucks.
Master streams can deliver
larger amounts of water than
hand-held hose.
Mattydale
Midship
A pumper with the pump
mounted cross ways on the
frame at the mid point of
the vehicle.
Monitor
A type of master
stream similar to a deck
gun, but removable from the
apparatus.
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PTO
A gear or chain driven
device that allows one
turning shaft to provide
power out to a pump or
winch. Fire apparatus PTO's
are typically mounted to the
transmission or the front of
the engine crank.
Pre-Connect
A firefighting hose line
that is connected to the
pumper and can easily be
deployed to attack a fire.
These lines are typically
150 to 250 feet in length. A
typical pumper will have two
1 3/4" lines and one 2
1/2" line preconnected.
Pressure
Governor
Controls pump pressure
by controlling engine speed.
Pump
to Tank Line
The plumbing used
to fill the booster tank
from the pump.
Pumper
Same as Engine.
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