Chapter 15 Fire Hose Flashcards
Standard on Fire Hose
NFPA 1961
A fire hoses measured diameter refers to what measurement?
The internal diameter.
What is the traditional length of fire hose in North America?
50’
Used to connect the pumper to a hydrant or other water source.
Suction hose (intake hose).
Standard on Automotive Fire Apparatus.
NFPA 1901
Large diameter hose, minimum of 15’ long, used to connect a pumper to a pressurized source (hydrant). Sizes range from 2 1/2” to 6”. Has two female or non threaded couplings.
Soft Sleeve Hose
Non collapsible hose that operates under a vacuum. Used to draft water from a static water source. Generally comes in 10’ sections. Sizes 2 1/2” to 6”. Two female or non threaded couplings.
Hard suction hose
Standard for Fire Hose Connections.
NFPA 1963
NFPA 1963 requires that all brands of fire hose coupling threads have what?
Compatabilty
What is the required thread type of fire hose called?
American National Fire Hose Connection Screw Threads. (National Hose)
What three types of alloys are used to make couplings?
Brass. Aluminum. Magnesium
Name three ways that couplings are manufactured.
Cast. Extruded. Drop Forged
Very weak. Only found on occupant type hose.
Cast
Lightweight and high strength. Usually made of aluminum. Stronger then cast couplings.
Extruded
Made of brass or other malleable metals. Strongest and most expensive couplings.
Drop Forged
A male coupling attached to a female coupling is called what?
A set (three piece coupling)
Name three types of coupling lugs.
Pin, Recessed, Rocker
Lug found on older fire hose. Not used anymore due to catching.
Pin
Lug found on booster hose. Enables hose to be wound up into a reel. Pin-lug spanner used to break connection.
Recessed
Modern fire hose lug. Prevents hose from catching on objects.
Rounded Rocker
Located on swivels of large intake supply or suction hose.
Handles or extended lugs.
Connected with locks or cams and not screw threads. Some have male and female ends, most are sexless.
Non threaded coupling
Name two types of sexless couplings.
Quarter turn. Stortz (turn 1/3)
T or F Can dirt become lodged into a sexless couplings grooves, giving the impression that it is a tight seal when it may not be?
True
Name six causes of fire hose damage.
Mechanical, Thermal, Organic, Chemical, Corrosion, Age deterioration.
Special cold resistance hose is rated for temps down to what?
-65F
Name three methods of removing frozen fire hose.
Melt the ice with a steam generating device. Chop the hose out with an axe. Wait until it has thawed.
Should fire hose that was frozen be service tested prior to being put back into service?
Yes
What types of fire hose can be affected by mold and mildew?
Hose with a woven jacket of cotton or other natural fiber.
If a fire hose has no been removed in ………… remove it, inspect it, sweep it, reload it.
6 months
When should fire hose be tested?
Annually and after sustaining possible damage or freezing
What type of hose should be completely dry before storing or reloading?
Cotton or cotton blend
What can fire hose be cleaned with?
Mild soap or bleach solution (5 percent in water)
Can chemical damage cause a separation of the outer jacket and the inner lining of a fire hose?
Yes
What should fire hose that has been exposed to acids or other caustic chemicals be cleaned with?
A mixture of bicarbonate of soda and water.
Do aluminum couplings develop a layer of corrosion that seals and prevents further corrosion?
Yes
How often should hose loads be removed and reloaded to prevent age deterioration?
Every six months
Because hose loaded on edge wears more quickly, manufactures recommend loading hose as a what?
Flat load
What should be done if fire hose needs to remain in a hose drying tower for a long period of time.
Change the hose/peg contact point.
NFPA 1962 requires hose to be tested when?
Annually and with in 90 days of being put in service.
The most common type of hose washing machine will wash hose up to what size?
3”
How can couplings be prevented from swinging while hose is hanging in outside drying towers?
Lash or tie the ends.
When storing cotton fabric hose how should it be keep?
Packed loosely to facilitate air movement.
How can couplings be cleaned.
Female = twist in a bucket of water and soap. Male= wire brush, soap, water.
Used in large pump intakes and incorporates a flat baffle to turns 90 degrees.
Butterfly valve
Similar to a wye appliance. Incorporates a inlet and outlet of the same size along with multiple other outlets of smaller sizes. This configuration allow water to be taken from the main supply line at intervals in the line.
Water Thief Appliance. ( large diameter stortz manifold)
When a large volume of water is needed near the end of the main supply line, what can be used? Consist of one large diameter inlet and three 2 1/2” outlets.
LDH manifold. (aka: portable hydrant, phantom pumpers, large -diameter distributors)
When are hydrant valves used?
When a forward lay is made from a low pressure hydrant.