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FDNY S-12 Citywide Supervision of Sprinkler Systems New
2024 Latest Version with All Questions and 100% Correct
Answer
Dry pipe valves are usually set at ________ psi above the normal trip level. --------- Correct Answer ----------- 15 to 20 An accelerator and exhauster are used to _______the time to allow water into the system. --------- Correct Answer ----------- Reduce A _______ shall be required to post tags at main control valve and any sectional valves. --------- Correct Answer ----------- Master Fire Suppression Piping Contractor __________ shall be posted on the tag indicating both static and flow pressures before and after. --------- Correct Answer ----------- Drain test results. Green tags indicate that __________. --------- Correct Answer ----------- No impairment was found. Green tags will be placed on the ____________. --------- Correct Answer ----------- Main Control Valve Both accelerator and exhauster are activated when a drop of _______ p.s.i. is detected in the system. --------- Correct Answer ----------- 2 In a preaction system, the ___________ is opened before the sprinkler heads. --------- Correct Answer ----------- Preaction Valve Preaction system alarms are given as soon as the _________ is opened. --------- Correct Answer ----------- Valve Three devices used to trip preaction valves are fixed temp devices, rate devices, and ___________ devices. --------- Correct Answer ----------- Combination The _________ feature shuts off water when the fire is extinguished and turns on again if the fire rekindles. --------- Correct Answer ----------- Recycling The ________ in the deluge system are open at all times. --------- Correct Answer -------- --- Sprinkler Heads _________ systems are usually found in basements or other difficult to reach areas. ---- ----- Correct Answer ----------- Perforated Pipe
________ nozzles are used for transformer vaults and other hazardous areas. --------- Correct Answer ----------- Open-Fixed Exterior exposure sprinklers use open sprinkler heads to form a _______ on the wall of a building. --------- Correct Answer ----------- Water Curtain _________ systems are used for the protection of special hazardous occupancies. ------ --- Correct Answer ----------- Foam Supply The C.O.F. holder shall know the location of all sprinkler heads, control valves, supply lines and _________ rooms. --------- Correct Answer ----------- Compactor A sign indicating the location of all _______ shall be kept in the compactor room. --------- Correct Answer ----------- Control Valves All indicating valves in the compactor sprinkler system shall be ________ open. --------- Correct Answer ----------- Sealed A minimum of _________ extra sprinkler heads with the appropriate wrenches shall be available to replace damaged ones. --------- Correct Answer ----------- 6 The C.O.F. holder shall conduct an inspection of the entire sprinkler system at least __________. --------- Correct Answer ----------- Once a month. Automatic ball drip devices shall be installed in the _________ position. --------- Correct Answer ----------- Horizontal If the sprinkler system is supplied from public water main, the control valve sign may read ________________. --------- Correct Answer ----------- "Shut-off for sprinkler system located 6 feet from this sign" Gate valves of the non-indicating type are called ________. --------- Correct Answer ----- ------ Curb Valves In an outside stem and yolk valve (OS&Y), valve position is indicated by the position of the ____________. --------- Correct Answer ----------- Stem On a post indicator valve (P.I.V.), the position of the valve is shown through a ___________. --------- Correct Answer ----------- Telltale FDNY connections to automatic sprinkler systems shall be painted ___________. --------
- Correct Answer ----------- Green FDNY connections to non-automatic sprinkler systems shall be painted ___________. -- ------- Correct Answer ----------- Silver
Facilities with less than 300 sprinklers require __________ spares to be available. ------- -- Correct Answer ----------- 6 Facilities with 301-1000 sprinklers require ________ spares to be available. --------- Correct Answer ----------- 12 Facilities with over 1000 sprinklers require ________ spares to be available. --------- Correct Answer ----------- 24 Pressure tank temperatures shall be kept at or above _________. --------- Correct Answer ----------- 40 Degrees Fahrenheit The maximum gross capacity of pressure tanks is _________ gallons. --------- Correct Answer ----------- 9000 Primary water pressure tanks shall be equipped with two _____________. --------- Correct Answer ----------- High And Low Alarm Systems Pressure tanks may be supervised by an approved ________ company which monitors the entire sprinkler system. --------- Correct Answer ----------- Central Station __________ tanks are made of wood, steel, or concrete. --------- Correct Answer --------- -- Gravity Gravity tanks should be at least ________ feet above the highest line of sprinkler heads. --------- Correct Answer ----------- 25 For every 1 foot the tank is above the discharge outlet ___________ p.s.i. of pressure is generated. --------- Correct Answer ----------- 0. Automatic fill pumps fill the tank at a rate of _________ g.p.m. or more. --------- Correct Answer ----------- 65 The _______ turn on the fill pump when the water in the tank is too low. --------- Correct Answer ----------- Floats Some methods to prevent ice inside a gravity tank are _________. --------- Correct Answer ----------- Circulated hot water, steam, steam coils, and sun heat The main reason a sprinkler sys. supplied by a gravity tank fails is __________. --------- Correct Answer ----------- Not enough water in the tank. The __________ pump is the standard pump currently used in fire protection systems. - -------- Correct Answer ----------- Centrifugal
The water available to the centrifugal pump must always be ___________. --------- Correct Answer ----------- Under pressure Centrifugal pumps are capable of discharging water from ____________ to _________ g.p.m. --------- Correct Answer ----------- 25 to 5, A vertical turbine pump is used to draw water from a well to ___________. --------- Correct Answer ----------- Fill a storage tank. Mud, gravel, and leaves may cause damage to the ___________. --------- Correct Answer ----------- A Vertical Fire pump When ____________ are installed, they are usually used in combination with a gravity tank or a pressure tank. --------- Correct Answer ----------- Manually Activated Pumps C.O.F. holders should manually activate the fire pumps iaw ___________. --------- Correct Answer ----------- Manufacturer Instructions Remote push-buttons are used to __________ the pump only. --------- Correct Answer -- --------- Start Pressure maintenance pumps (Jockey Pumps) are used to __________ pressure in the system. --------- Correct Answer ----------- Restore The _________ pump increases pressure to an acceptable level. --------- Correct Answer ----------- Booster The temperature in the pump room should be maintained above __________. --------- Correct Answer ----------- 40 Degrees Fahrenheit Missing or defective pipe hangers can cause the system to fail due to ______________. --------- Correct Answer ----------- Pipe Rupture __________ shall not be used to fasten the system or building attachments to the structure. --------- Correct Answer ----------- Nails Visual inspection of hanging and bracing is not required for piping concealed above __________. --------- Correct Answer ----------- Ceilings ____________ lines are directly connected to sprinkler heads. --------- Correct Answer -- --------- Branch _________ are able to supply feed mains or cross mains directly. --------- Correct Answer ----------- Risers
Prior to returning a sprinkler system to service, the ___________ shall ensure that necessary tests and inspections are conducted. --------- Correct Answer ----------- Impairment Coordinator Glycerin not greater than _________ percent or glycol not greather than ________ percent shall be used to protect from freezing. --------- Correct Answer ----------- 50 and 40 The C.O.F. number and signature of C.O.F. holder shall be posted near the ____________. --------- Correct Answer ----------- Main Control Valve __________ shall be readily available to any representative of the Fire Department these are to be maintained on site for 3 years. --------- Correct Answer ----------- Records Failure to do inspections may result in __________ of the C.O.F. and court proceedings. --------- Correct Answer ----------- Revocation The C.O.F. holder may inspect, test, and perform routine maintenance if they hold the following certificates: --------- Correct Answer ----------- Refrigeration Operating Engineer, High Pressure Operating Engineer and High Pressure Operating Engineer. A ________ can inspect, maintain, test, and repair all fire standpipe and sprinkler systems. --------- Correct Answer ----------- Master Fire Suppression Piping Contractor (MFSPC) A Master Plumber (MP) with C.O.F. is limited to residential occupancies with _________ sprinkler heads or less. --------- Correct Answer ----------- 30 About _________ percent of fires are extinguished or controlled when sprinklers are installed. --------- Correct Answer ----------- 96 Wet pipe systems has water at a minimum temperature of ___________ to prevent the system from freezing. --------- Correct Answer ----------- 40 Degrees Ferinhight __________ valves are no longer permitted to be installed. --------- Correct Answer ------ ----- Cold weather ________ systems are installed where a wet pipe system cannot be heated to prevent freezing. --------- Correct Answer ----------- Dry pipe The drop in ________ causes a special dry pipe valve to open. --------- Correct Answer - ---------- Air Pressure In buildings where life hazard is high (Schools, Hospitals) the alarm is transmitted directly to the _________. --------- Correct Answer ----------- Fire Department
Dry pipe valves are of a _________ design. --------- Correct Answer ----------- Clapper For pipe other than 1-1/4, the maximum distance between hangers is __________ feet. --------- Correct Answer ----------- 15 CPVC pipe hanger space for 3/4 inch pipe is ___________. --------- Correct Answer ----- ------ 5 ft. 6 in. CPVC pipe hanger space for 3 inch pipe is ________ feet. --------- Correct Answer ------- ---- 10 The distance from a hanger assembly to the centerline of a sprinkler head shall not be less than __________. --------- Correct Answer ----------- 3 inches Systems above _________ p.s.i. have different support requirements. --------- Correct Answer ----------- 100 NYC building code requires sway bracing for sprinkler sys. installed after __________. - -------- Correct Answer ----------- 1998 Minimum size hanger rods for pipe diameter up to 4 inches: ___________. --------- Correct Answer ----------- 3/ Minimum size hanger rods for pipe diameter of 5-8 inches: ____________. --------- Correct Answer ----------- 1/ Minimum size hanger rods for pipe diameter of 10-12 inches: ___________. --------- Correct Answer ----------- 5/ The inside of pressure tanks shall be inspected carefully every _________ years. --------
- Correct Answer ----------- 3 When inspecting pressure tanks, the compressor shall be capable of pressurizing to _________ psi within 3 hours or less. --------- Correct Answer ----------- 75 Pumps should be activated each week and run for _______ minutes in accordance to the manufacturers specifications. --------- Correct Answer ----------- 10 Installations that don't appear correct include sprinkler heads located more than _________ inches below the ceiling. --------- Correct Answer ----------- 22 The presence of obstructions in sprinkler systems shall be checked every _________ years. --------- Correct Answer ----------- 5
sprinklers. When it opens, water flows into the piping system and discharges from all sprinklers attached. Early Suppression Fast Response Sprinklers --------- Correct Answer ----------- Fast response sprinkler that is listed for its capability to provide fire suppression of specific high challenge fire hazards. Extra Large Orifice Sprinklers --------- Correct Answer ----------- = or > 1 inch less pressure to achieve a given discharge density. Extended Coverage Sprinkler --------- Correct Answer ----------- 400 max square feet discharge 20 foot by 20 foot spacing between sprinklers. Fire Pump --------- Correct Answer ----------- A provider of liquid flow and pressure dedicated to fire protection. A fire pump is a part of a fire sprinklers system water supply and can be powered by electric, diesel or steam. connected to public water source or tank. provides higher pressure to sprinkler system. Glass Bulb Sprinkler --------- Correct Answer ----------- Operated by heat breaking a glass bulb filled with a non freezing liquid with diameters that vary form 3 mm for quick response to 5 mm for standard response. Hose Valve --------- Correct Answer ----------- Valve to an additional hose connection. Hydraulic Placard --------- Correct Answer ----------- A sign attached to a hydraulically calculated sprinkler system indicating the design density, required gallons per minute and pressure for the system to operate properly. Hydraulically Calculated Systems --------- Correct Answer ----------- Method of sizing auto sprinkler piping using a prescribed amount of water to be distributed over a specific area. Impairment Coordinator --------- Correct Answer ----------- Person in charge of safety during out of service systems. Intermediate Level Sprinkler --------- Correct Answer ----------- Sprinkler equipped with integral shields to protect the operating element form discharge from sprinklers installed at higher elevations. large orifice sprinkler --------- Correct Answer ----------- sprinkler head with orifice size equal or greater than 3/4 and less than 1 inch listed device --------- Correct Answer ----------- A fire protection component that has been tested to perform under parameters specified for its use by a nationally recognized testing agency. Underwriter's Laboratory (UL) and Factory Mutual (FM) are the two most common.
Master Pressure Reducing Valve --------- Correct Answer ----------- A pressure reducing valve installed to regulate pressures in an entire fire protection system and/or standpipe system zone. Main Drain --------- Correct Answer ----------- The primary drain connection located on the system riser and also utilized as a flow test connection. Microbiologically Influenced Corrosion (MIC) --------- Correct Answer ----------- Corrosion caused by the presence of microbes in the water supply that over time attack the interior of metallic piping and cause leaks, pitting, and blockages. Old-Style/Conventional Sprinkler --------- Correct Answer ----------- A sprinkler that directs 40% to 60% of the water initially in a downward direction and is designed to be installed with the deflector in either the upright or pendent position. Pendent Sprinkler --------- Correct Answer ----------- A sprinkler designed to be installed in such a way that the water stream is directed downward against the deflector. Pintle Screws --------- Correct Answer ----------- A visual indicating device required for sprinklers manufactured prior to 1999 identifying small orifice sprinklers and large orifice sprinklers where orifice size is different than the nominal thread size of the sprinkler head. Pipe Schedule Systems --------- Correct Answer ----------- A method of sizing piping based upon the number of sprinkler heads and the occupancy of the protected area. Preaction Sprinkler System --------- Correct Answer ----------- A sprinkler system employing automatic sprinklers that are attached to a piping system that contains air that may or may not be under pressure, with a supplemental detection system installed in the same areas as the sprinklers. Pressure Control Valve --------- Correct Answer ----------- A pilot operated pressure reducing valve that may be used with a fire or booster pump designed for the purpose of preventing the incoming water supply pressure from dropping below a set pressure. Pressure-Reducing Valve --------- Correct Answer ----------- A valve designed for the purpose of reducing the downstream water pressure under both flowing (residual) and nonflowing (static) conditions. Pressure Relief Valve --------- Correct Answer ----------- A valve designed for the purpose of releasing excess air or water pressure from the Fire Protection Piping System. Pressure Tank --------- Correct Answer ----------- A tank using air pressure to supplying water for water-based fire protection systems. Tank contents to be maintained at one third air to two thirds water.
Water Spray Fixed System --------- Correct Answer ----------- A special fixed pipe system connected to a reliable fire protection water supply and equipped with water spray nozzles for specific water discharge and distribution over the surface or area to be protected. The piping system is connected to the water supply through an automatically or manually actuated valve that initiates the flow of water. An automatic valve is actuated by operation of automatic detection or manual release equipment installed in the same areas as the water spray nozzles. (In special cases, the automatic detection system may also be located in another area.) PREACTION SPRINKLER SYSTEMS --------- Correct Answer ----------- designed for situations where there is danger of serious water damage. Water damage is usually caused by damaged sprinklers or broken piping. Under normal conditions there is no water in the piping. The air in the piping may or may not be is under pressure. A preaction valve prevents the water from entering the system. The valve is automatically opened when a fire detection system discovers that there is a fire or smoke condition. The preaction valve is tripped by the fire detection system before any of the sprinkler heads open. A supervisory device signals when the valve is opened. The preaction valve can also be operated manually. DELUGE SPRINKLER SYSTEMS --------- Correct Answer ----------- equipped with open sprinkler heads designed to wet down an entire area involved in a fire. This system is needed when there is danger of a fire rapidly spreading throughout the building. The deluge system will slow down the spread of the fire. Deluge systems are suitable for hazardous occupancies. This includes buildings in which flammable liquids or other hazardous materials are handled or stored. The sprinkler heads in the deluge system are open at all times. Under normal conditions there is no water in the piping. The air in the piping is not under pressure. A closed control valve prevents water from flowing into the system. A fire detection device automatically opens the control valve when a fire is identified. A supervisory device signals when the valve is opened. When the valve is opened water flows into the system. The water is then discharged out all of the sprinkler heads. The water control valve may also be opened manually. NON-AUTOMATIC DRY SPRINKLER SYSTEMS --------- Correct Answer ----------- ll pipes are normally dry. Water is supplied when needed by pumping water into the system through the Fire Department connection. Some of these systems are supplied by manual operation of a water control valve and may be equipped with sprinklers with or without fusible links. There are several non-automatic systems: 1) Perforated pipe systems - a single line of piping drilled at intervals for water discharge. These systems are usually found in basements or other areas difficult to reach in fire fighting operations. 2) Open fixed spray nozzles for transformer vaults or other hazardous areas; 3) exterior exposure sprinklers (or window sprinklers) use open sprinkler heads to form an external water curtain on the walls of a building, and 4) Foam supply systems are used for the protection of special hazardous occupancies.
Curb Valves --------- Correct Answer ----------- Gate valves of the non-indicating type are provided in water distribution systems. Gate valves allow the sprinkler system to be shut off for repairs or maintenance. Such valves are normally a non-rising stem type. They are operated using a special key wrench. A valve box is located over the valve to keep dirt from the valve. The valve box also provides a convenient access point for the valve wrench to the valve nut. A complete record should be made for each valve in the system. This record should include the exact location, the date it was installed, the make, the direction of opening, number of turns to open, and any maintenance that was performed. The control valve for the building may also be on the outside wall or attached to an upright post, known as a post indicator valve (PIV). The building or section of the building controlled by the valve is usually marked on the post. The position of this valve (open or closed) is shown through a telltale opening in the post. On some posts, a padlock must first be opened to release the operating wrench or wheel handle. Pumper Connections for Fire Department Use --------- Correct Answer ----------- Fire Department connections must always be accessible. Each connection shall be fitted with a lower check valve. The lower check valve prevents the backflow of the private water supply into the Fire Department connection. The figure below shows the main features of a Fire Department connection. Fire Pumps --------- Correct Answer ----------- used as a main water supply source for sprinkler systems. They may also be used in combination with gravity tanks to supply sprinkler system. Fire pumps are designed to take the water from a supply source and then discharge the water into the fire protection system under pressure. Waterflow Alarm Valves --------- Correct Answer ----------- The basic design of most water-flow alarm valves is that of a check valve which lifts from its seat when water flows into a sprinkler system. This alarm then starts an audible signal to alert the occupants in the building that the sprinkler system has been activated. Vane type waterflow --------- Correct Answer ----------- Switches have a paddle inserted inside the main supply piping perpendicular to the direction of flow. Upon waterflow, the paddle switch transmits an alarm. Vane type waterflow switches cannot be installed to monitor waterflow in dry pipe sprinkler systems. Alarm Retarding Devices --------- Correct Answer ----------- An alarm check valve that is exposed to changing water supply pressure needs an alarm retarding device. This is required to prevent false alarms when the check valve clapper is lifted from its seat by a temporary pressure surge. Vane type water flow switches sensitivity can also be adjusted to changing water pressures. The Centrifugal Pump --------- Correct Answer ----------- The centrifugal fire pump is the standard pump currently used in fire protection systems. This is the preferred pump because it is reliable, compact, requires low maintenance, and it can be powered by a
- at inspectors test note time that water flows steadily.
- test terminated when clean water flows (shit valve) compare to past tests fire hydrant --------- Correct Answer ----------- A valve connection on a water supply system having one or more outlets and that is used to supply hose and fire department pumps with water. Control valve --------- Correct Answer ----------- A valve controlling flow to water base fire protection system. Control valve do not include hose valves Fire pump locations --------- Correct Answer ----------- the fire pump should be located in a place that is noncombustible or fire resistant. has to be heated to a minimum of 40 degrees Fahrenheit. Gravity tanks should be how high above the highest sprinkler head? --------- Correct Answer ----------- 25 feet. What are the three methods to heating a gravity tank --------- Correct Answer ----------- Hot water circulation Steam is discharged directly into the tank steam coils are placed inside the tanks Heat from the sun is used Automatic fill pumps supply the water to most gravity tanks. The pumps fill the tank at a rate of __ gpm --------- Correct Answer ----------- 65 Centrifugal pump can pump at a rate of --------- Correct Answer ----------- 25 to 5000 gallons per minute what is a fire hydrant? --------- Correct Answer ----------- A valve connection on a water supply system having one or more outlets and that is used to supply hose and fire department connections with water. What is the purpose of gate valves? --------- Correct Answer ----------- A valve controlling flow to water based fire protection systems. Is used to isolate,shut off, and open sprinkler systems.
. A detailed record shall be kept on the premises or other approved location, for a minimum of 3 years for examination by any representative of the Fire Department -------- -- Correct Answer -------- Automatic and non automatic sprinkler system records should be kept for
how many extra sprinkler heads are needed at all times? ---------- Correct Answer -------- A supply of at least six extra sprinkler heads shall be kept available on the premises, to replace promptly any fused or damaged sprinklers. how often should a sprinkler system get pressure tested? ---------- Correct Answer -------
- At least once every five years, the Fire Department connection or connections for a sprinkler system shall be subjected to a hydrostatic pressure test to demonstrate its suitability for Fire Department use who's responsibility is it to maintain the sprinkler system? ---------- Correct Answer -------- It shall be the owner's responsibility to maintain the sprinkler system and to determine the individual qualifications and competencies of the COF holder that performs the functions related to inspection, testing and maintenance of such system. who is the impairment coordinator ---------- Correct Answer -------- The building owner shall assign an impairment coordinator, The impairment coordinator shall take the action(s) when a standpipe system, sprinkler system or fire alarm system is out of service. who must be notified when there is a planned removal from service? ---------- Correct Answer -------- When the system, or a portion of the sprinkler system, is placed out of service for a scheduled inspection, testing, regular maintenance, minor repairs or for construction affecting not more than 1 floor, when must the fire department be notified regarding sprinkler systems for out of service conditions? ---------- Correct Answer -------- NOTIFICATION THAT A SPRINKLER SYSTEM OR FIRE ALARM SYSTEM, OR ANY PART THEREOF, IS OR WILL BE OUT OF SERVICE SHALL BE MADE TO THE FIRE DEPARTMENT UNDER THE FOLLOWING CIRCUMSTANCES: 1. The sprinkler system or fire alarm system is or will be out of service on more than one floor of a building; or 2. The work or repairs cannot be completed, and the system restored to service, within 8 hours of the time the system was placed or went out of service; or 3. With respect to a fire alarm system, the work or repairs will require the fire alarm system to be out of service for more than 8 hours in any 24-hour period; or 4. One or more other fire protection systems in the area in which a fire protection system is out of service are or will also be out of service at the same time. what is put when a system is in an unplanned out of service condition? ---------- Correct Answer -------- In addition, for an unplanned out of service condition, a disc (white or blue) shall be placed at all affected fire department connections what is placed when there is no impairment with the sprinkler system? ---------- Correct Answer -------- If no impairment is found in the entire system green tags will be placed on the main control valve.
EARLY SUPPRESSION FAST RESPONSE SPRINKLER (ESFR) ---------- Correct Answer -------- A type of fast response sprinkler that is listed for its capability to provide fire suppression of specific high challenge fire hazards. EXTRA LARGE ORIFICE SPRINKLERS (ELO ---------- Correct Answer -------- A sprinkler head with and orifice size equal to or greater than 1". This sprinkler is used for protection of high piled storage in warehouses and less pressure is required to achieve a given discharge density. EXTENDED COVERAGE SPRINKLERS ---------- Correct Answer -------- - A type of spray sprinkler with a maximum area of coverage of 400 square feet (20 foot by 20 foot spacing between sprinklers) for light hazard occupancies to a maximum of 144 square feet (12 foot by 12 foot spacing between sprinklers) for extra hazard occupancies. MASTER PRESSURE REDUCING VALVE ---------- Correct Answer -------- A pressure reducing valve installed to regulate pressures in an entire fire protection system and/or standpipe system zone. PINTLE SCREWS ---------- Correct Answer -------- A visual indicating device required for sprinklers manufactured prior to 1999 identifying small orifice sprinklers and large orifice sprinklers where orifice size is different than the nominal thread size of the sprinkler head. PRESSURE CONTROL VALVE ---------- Correct Answer -------- A pilot operated pressure reducing valve that may be used with a fire or booster pump designed for the purpose of preventing the incoming water supply pressure from dropping below a set pressure. PRESSURE-REDUCING VALVE ---------- Correct Answer -------- A valve designed for the purpose of reducing the downstream water pressure under both flowing (residual) and nonflowing (static) conditions what temperature should the water be in a wet pipe system? ---------- Correct Answer --- ----- The owner is to ensure that all areas of buildings with water-filled piping are maintained at a minimum of 40 degrees Fahrenheit and are protected from freezing Existing Cold Weather Valves ---------- Correct Answer -------- An automatic sprinkler system should not be shut off and drained to avoid freezing during cold weather. However, parts of the sprinkler system may be shut down. Permission must be obtained from the local fire house. Permission may be given to shut off a maximum of 10 sprinkler heads on a wet pipe system. These shutoff valves are commonly referred to as cold weather valves. Dry Pipe Sprinkler System ---------- Correct Answer --------. A sprinkler system employing automatic sprinklers that are attached to a piping system containing air or
nitrogen under pressure, the release of which (as from the opening of a sprinkler) permits the water pressure to open a valve known as a dry pipe valve, and the water then flows into the piping system and out the opened sprinklers. when do you use dry pipe sprinkler systems? ---------- Correct Answer -------- Dry Pipe Sprinkler Systems are installed where it is impractical to install a wet pipe system since the protected area cannot be heated to prevent freezing conditions. Quick Opening Devices ---------- Correct Answer -------- These devices are an accelerator and an exhauster. They are both automatically activated when a drop of 2 psi in air pressure is detected in the system. They quickly change the water and air pressure balance in the system preaction sprinkler systems ---------- Correct Answer -------- Preaction systems are designed for situations where there is danger of serious water damage. what is the advantage of a preaction system? ---------- Correct Answer -------- The preaction valve opens sooner because the fire detectors react to heat changes faster than sprinkler heads what devices can be used to trip a pre-action valve? ---------- Correct Answer -------- There are three main devices used to trip pre-action valves: 1) devices designed to operate at a fixed temperature; 2) devices designed to operate when the temperature in the room increases a set amount in a given time period (rate-of-rise), and 3) devices combining fixed temperature and rate of rise devices. Preaction System with a Recycling Feature ---------- Correct Answer -------- This system shuts off the water when the fire has been put out or the heat drops. If the fire rekindles or the heat rises sharply, water is discharged again. The system continues cycling on and off as long as the fire persists Combined Dry Pipe and Preaction Systems ---------- Correct Answer -------- These systems have the basic features of both types of systemsA heat detecting device opens the water control valve and a quick opening device. The system then fills This book is provided to the public for free by the FDNY. 28 28 with water and operates as a wet pipe system Perforated pipe systems ---------- Correct Answer -------- - a single line of piping drilled at intervals for water discharge. These systems are usually found in basements or other areas difficult to reach in fire fighting operations non-automatic systems: ---------- Correct Answer -------- Open fixed spray nozzles for transformer vaults or other hazardous areas;
