FDNY QUESTIONS WITH CORRECT ANSWERS GRADED TO PASS

1 3/4 hose - -pimary attack line of FDNY -Coupling size is 1 1/2 -Friction loss in each 50 ft length is 20psi -operating pressure limited to 250psi -Each length is 50 ft long 2 1/2 hose - -Most VERSATILE hose (Attack/Supply) -More water flow but, heavier less maneuverable -Coupling size is 2 1/2 -Operating pressure is 250 psi -Friction loss in each length is 5 psi -Each length is 50 ft long 2" polyurethane lightweight hose - -Used ONLY as an LEAD attack line in standpipe residential buildings -Coupling size is 2 1/2 -Operating pressure is 250psi -Friction loss in each length is 10 psi -Midpoint of the hose is painted red, this facilitates a smooth deployment of the hose and is refereed to as the "A-fold" -Reflective arrows on each female coupling serves as a directional indicator pointing in directions of the water source 2 1/2 polyurethane lightweight hose - -Colored white with red stripes -Used as an attack line when using a standpipe system -Each length is 50ft -Operating pressure is 250 psi -Friction loss in each length is 5psi -Midpoint of the hose is painted red, this facilitates a smooth deployment of the hose and is refereed to as the "A-fold" -Reflective arrows on each female coupling serves as a directional indicator pointing in directions of the water source 3 1/2 hose - -Used ONLY as a supply line -Each length is 50 feet long -Coupling size is 3" -Operating pressure is 300psi -Friction loss per length is approximately 3psi, this depends on several factors including length of the stretch and amount of water flowing Nozzle - A line appliance that is used to direct flow of water, increase the velocity of flow, or disperse water in various patterns. They are identified by the type of water pattern created and size of the tip used. 2 parts of Nozzle - 1)Shut off-contains the handle that controls the opening and closing of the nozzle, may sometimes be equipped a pistol grip 2)Tip-an attachable component that shapes the stream of the water, two types of tips.... Main stream tips (MST) attach directly to the shut off and have a threaded outlet orifice. In FDNY nozzles to be used as FIRE ATTACK are equipped with MST....Outer Stream Tip (OST) are smaller and attach to the threaded outlet orifice of the MST, the only OST used in FDNY is 1/2 inch tip, should only be used in overhaul operations 3 basic metrics used to describe performance of nozzle - 1)Nozzle pressure in order to create the desired stream nozzles must be supplied with sufficient pressure at the tip(Measured in PSI) 2)Nozzle reaction measures the force of water flowing, measured in pounds 3)Flow rate measurement of how much water is discharged by nozzle measured in gallons per minute GPM Solid Stream Nozzle - Create a solid straight stream of water, provides high volume flows at low pressure and has a long stream reach, superior penetration, and manageable nozzle reaction 1 3/4 nozzle - -used with 1 3/4 hose -1 1/2 coupling and a 15/16" MST used for attack -required pressure is 50 psi at tip -flow rate at 50psi is 180 GPM -at 50 psi the nozzle pressure force is 69lbs -a 1/2 OST can be attached for overhaul purposes 2 1/2" nozzle - -used with 2 1/2 hose -has a 2 1/2 coupling and a 1 1/8 MST used for attack -required pressure at tip is 40psi -at 40psi flow rate is 235 GPM -Nozzle reaction at 40 psi is 78 pounds -at 50 psi the flow rate is 265 GPM -Nozzle reaction at 50 psi is 98 pounds -Nozzle should be marked with white tape around the MST 2" nozzle - -used with 2" lightweight hose -2 1/2 coupling and a 1" MST used for attack -50 psi required at tip -at 50 psi flow rate is 210 GPM -Nozzle reaction at 50 psi is 77 pounds -at 55psi the flow rate is 220 GPM -nozzle reaction at 55 psi is 85 pounds -a 1/2 OST can be attached to MST for overhaul purposes Fog Nozzle - Can produce straight stream or a fog pattern, the straight stream is hollow. The fog pattern is adjusted by rotating the outer barrel and the reach of the stream depends on the width of the pattern.. When the pattern is wider the reach will become shorter Removable fog tips may have a fixed pattern without the option of a straight stream Fog patterns are effective for maximizing hydraulic ventilation dispersing gas vapors and extinguishing fire near electrical equipment.. However limited reach and entrain (draw in) air as they operate Fog nozzles classified in two ways - 1)Variable flow provide a different flow rate depending on the fog pattern selected, all fog nozzles in FDNY are variable flow 2)Variable Pressure will allow their nozzle pressure to change as fog pattern is adjusted,all fog nozzles in FDNY are also variable pressure 1 3/4 fog nozzle - -used with 1 3/4 hose -1 1/2 coupling and a fog tip -Pressure required at tip is 100psi -at 100psi the flow rate can reach 200 gpm -at 200gpm the reaction is 101 pounds -fog nozzle can be a straight stream or fog stream -straight stream rotated to the right -fog pattern the tip is rotated to the left, further left it goes the wider the fog pattern 2 1/2" Fog Nozzle - -used with 2 1/2 hose -2 1/2 coupling and fog tip -required pressure is 100 psi at tip -at 100 psi the flow rate is 250 gpm -at 250 gpm the reaction is 121 pounds -fog nozzle can be a straight stream or fog stream -straight stream rotated to the right -fog pattern the tip is rotated to the left, further left it goes the wider the fog pattern Fittings - A hose connection that allows dissimilar couplings to become coupled , also allows for different size couplings to be connected 4 categories Reducer Fitting - Allows for larger male couplings to connect to smaller female couplings Increaser fitting - Allows for smaller male couplings to connect to larger female couplings Double male fitting - Allows for 2 female couplings of same size to be connected Double female fitting - Allows for two male couplings of the same size to be connected Fittings are available in all necessary sizings for the 4 categories, multiple fittings may be used - There also exists a fitting designed as a hydrant connection which is a double female with different size couplings, one side has 4 1/2 thread for the hydrant and the has 3" threads for a 3 1/2 hose connection Adapter - A fitting that allows for connection with FDNY threads and NST threads or National pipe threads Four categories 1-adapter with male FDNY coupling and female NST 2-adapter with female FDNY coupling and male NST 3-double male adapter with male fdny and male NST 4- Double female adapter with female FDNY and female NST National pipe threads - Deeper then NST and FDNY threads (More threads..longer) In line pressure gauge - Used to measure the pressure and flow being delivered from a standpipe system, it DOES NOT regulate water flow it simply monitors the pressure and flow being supplied Spanner Wrench - Used to tighten and loosen hose couplings 2 basic types Flip open carried by firefighter in bunker coat pocket Straight spanner carried on apparatus Hose Strap - Used to secure a hoseline that has been stretched a distance vertically to prevent hose from falling back down, commonly used when performing a well hole stretch, fire escape stretch, or a rope stretch. Two types of hose straps, every firefighter is issued one, ideal location to secure is just below the coupling to minimize the likelihood of the hose slipping - 1-rope hose strap with hook has a metal hook and opposite end has a loop in rope 2-noon hose strap with carabiner one end has a loop in nylon strap other has a red carabiner Engine company hose requirements - -20 lengths of 1 3/4 hose... At least 4 lengths shall be carried either rolled or arranged in roll up one length maintained with 1 3/4 nozzle - 1 length of 2" lightweight hose with a 2" nozzle and 1" mst attached (green/red stripe)should be arranged in roll up -3 lengths of 2 1/2 lightweight hose with 2 1/2 nozzle and 1 1/8 MST(white/red stripe) maintained as a roll up with one length having a 2 1/2 nozzle attached -30 lengths of 2 1/2 hose -10 lengths of 3 1/2 hose Typical hose load - One bed of 3 1/2 One bed of 2 1/2 Two beds of 1 3/4 coupled with 2 1/2 hose to finish out the load No more then 6 lengths of - 1 3/4 hose should be used as lead lengths the greater friction loss in this hose precludes the use of more lengths without the danger of exceeding maximum working pressure