09 Aircraft Hangars buckeyefire com

09 Aircraft Hangars Buckeyefire Com-Free PDF

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GROUP IV AIRCRAFT HANGAR A hangar constructed Y A 360 . of a membrane covered rigid steel frame R B , FIRE PROTECTION OPTIONS Where Y Maximum arc of oscillation in degrees . R Nozzle range in feet , Once the aircraft hangar classification has been 3 14159. determined a suitable fire protection system can be A Nozzle flow rate in gpm . established There are four types of foam fire B Application rate in gpm per sq ft . protection systems suitable for the protection of an aircraft. hangar These systems may be used separately or they The following formula is used to find the sq ft area of. may be combined coverage required for any monitor . Overhead Foam Water Sprinkler System Area of coverage r2 arc of oscillation . Deluge system Group I II 360o, Closed head pre action system Group II Note . Standard wet pipe This formula should be used as a guide only The. limitation is that the formula cannot calculate for. If used with either Protein or Fluoroprotein type foam the area below and close to the monitor nozzle. concentrate the foam water sprinkler heads shall be the where the floor would not normally be covered . air aspirating type When used with A F F F the except for unintentional drop out due to the. sprinkler heads can be the standard non air aspirating effects of gravity and foam flow back toward. type the nozzle as a result of the slope of the floor . Foam Monitor System Consult the Buckeye Engineering Department for. additional assistance , Monitor Systems may be of the oscillating or fixed. nozzle type , Foam Hand Hose Line System , Oscillating Monitor Systems consist of monitors that.
automatically oscillate from side to side when These systems are required as supplementary. protection in group I and II aircraft hangars , discharging foam onto the hangar floor They are. normally preset to oscillate over a given arc to, High Expansion Foam System . provide the correct application rate over a specific. area The unit is typically driven by a water turbine These systems are designed to discharge an expanded. mass of foam bubbles over the protected area to a depth. which requires no external power source other than. of at least 3 ft 0 9 metre within 1 minute and flow for a. a pressurized flowing water supply For special minimum of 12 minutes . applications electric powered oscillating monitors. are also available GROUP I HANGAR FIRE PROTECTION DESIGN. Fixed Monitor Systems have nozzles that are typically REQUIREMENTS. mounted on a manifold or as single units approximately. 3 feet 0 9 metre above the hangar floor They are A Group I aircraft hangar can have an approved foam . water deluge system covering the aircraft service and. preset for angle of elevation and discharge pattern to. storage areas It is to be installed in accordance with. achieve the best possible stream pattern and range NFPA 16 Standard on Deluge Foam Water Sprinkler and. while keeping the stream low enough to flow under Foam Water Spray Systems with an application rate of. the wing of any aircraft This type of monitor system is 0 16 gpm per sq ft 6 5 lpm sq m when standard. often used where aircraft or maintenance equipment sprinkler heads are used If air aspirating type heads are. in the hangar could interfere in the normal operation used the application rate is to be 0 20 gpm per sq ft . of an oscillating monitor Sprinkler spacing as projected on the floor shall be. limited to 130 sq ft per head 12 1 sq m The maximum. The following formula can be used as a guide to find. distance between sprinklers either on branch lines or. the maximum arc of oscillation to give the necessary. between branch lines shall be 12 feet 3 7 m The, foam solution application rate when the nozzle inlet maximum protected area for each. pressure and discharge range is known , 3, individual deluge system is to be 15 000 sq ft 1 395 sq Where there is an aircraft with a wing area in excess of. m 3 000 sq ft 279 sq m that DOES NOT have drained, and purged fuel tanks an approved supplementary.
Other fire protection options include foam water fire protection monitor system is to be. installed , 1 A combination of automatic sprinkler protection in. accordance with NFPA 13 AND an automatic Low Level Foam water hand hose systems shall be installed if the. Low Expansion Foam System aircraft DO NOT have drained and purged fuel tanks If. the aircraft HAS drained and purged fuel tanks water only. 2 A combination of automatic sprinkler protection in hand hose lines may be installed . accordance with NFPA 13 AND an automatic Low Level. High Expansion Foam System WATER SUPPLY, Individual automatic sprinkler systems in Group I For overhead deluge systems sufficient water supply. hangars shall not exceed 52 000 sq ft 4 831 sq M requirements are determined by assuming that a fire at. The application rate shall be 0 17 gpm sq ft 6 9 lpm any point will operate all the systems in every draft. sq m over the hydraulically most remote 15 000 sq ft curtained area that is wholly or partially within a 100 ft . 1 394 sq m 30 5 m radius of that point measured horizontally . The quantity of foam concentrate required is to be For design purposes the water supply should operate for. sufficient to operate the system for 10 minutes at the a minimum of 60 minutes when all systems designed to. actual flow rate No reduction in run time is permitted if operate simultaneously flow at their designed pressure. the system overdischarges and flow rate If the hangar has a supplementary foam. protection system the water supply shall be sufficient to. The foam concentrate requirements should be calculated flow for a minimum duration of 45 minutes . to include a 15 overage for hydraulic balance , High Expansion Foam System. If the foam water sprinkler system is also used for. column fire protection within the hangar in lieu of the A High Expansion Foam System installed in an aircraft. column having a fire resistive rating of not less than 2 hangar is to be designed to cover the protected area to a. hours allowances must be made for the additional foam depth of 3 feet 0 9 metre with a mass of foam bubbles. concentrate required within 1 minute High Expansion Systems must have. sufficient foam concentrate and water to operate at the. Foam concentrate reserve supplies shall comply with design application rate for a minimum of 12 minutes . the following requirements When a high expansion system is installed inside a. hangar allowances must be made for the possibility that. Group I Hangars A reserve supply of foam concentrate the foam could be affected by any discharging. shall be provided in accordance with 4 3 2 5 2 of NFPA 11 sprinkler system Please refer to the section on High. Expansion Foam Systems in this Engineering Manual for. Group II Hangars There shall be a reserve of foam, further information . concentrate of a compatible type directly connected to the. system The reserve supply shall be in the same quantity as. the main supply To prevent accidental depletion of this The generators should only be mounted at the ceiling or. reserve supply it shall be available to the system only by on exterior walls of the hangar where outside air only. intentional manual operation required by NFPA 409 is used to generate the foam . Group IV Hangars A reserve supply of foam concentrate Note . shall be provided in accordance with 4 3 2 5 2 of NFPA 11 For the most part high expansion foam generators do. not project a foam stream as would be experienced with. If the foam concentrate is injected into the water supply an oscillating monitor The distance projected outward. by foam pumps two pumps are to be installed Either from the generator is relatively short and as such extreme. pump should be capable of supplying the foam caution should be exercised where high expansion foam. concentrate at the maximum system demand flow rate generators are mounted on exterior walls In some cases. it may not be possible to achieve the desired coverage. A jockey pump should be installed where the foam when the generators are mounted on the wall . concentrate piping from the foam pump s to the, injection point is below ground or if above ground 50 ft It is recommended that the high expansion generators be.
15 24 m in length or greater The jockey pump is to installed so that the flow of foam on the floor is directed to. keep the foam concentrate line pressurized at all times to areas beneath aircraft wings and center sections . ensure prompt injection of concentrate into the system. when activated , GROUP II HANGAR FIRE PROTECTION 2 A High Expansion Foam System with an. REQUIREMENTS effective application rate of 3 cu ft min per sq ft . 0 9 cu m per sq m , The fire protection requirements of a Group II hangar may. be one of the following B Where the hangar fire area is greater than 12 000 sq . ft 1 115 sq m and the aircraft are unfueled the fire. In accordance with the requirements for a Group I protection shall be in accordance with one of the. hangar following , A combination of automatic sprinkler protection in 1 A Low Expansion Low Level Foam System over. the whole storage and servicing area at 0 1 gpm sq . accordance with NFPA 13 AND an automatic Low , ft 4 1 lpm sq m . Level Low Expansion Foam System , 2 A High Expansion Foam System with an effective.
A combination of automatic sprinkler protection in application rate of 3 cu ft min per sq ft 0 9 cu m . accordance with NFPA 13 AND an automatic Low per sq m . Level High Expansion Foam System 3 Automatic Sprinkler Protection that complies with. the following criteria , A Closed Head Foam Water Sprinkler System . Closed head water sprinkler system in, accordance with NFPA 13 . Individual automatic sprinkler systems in Group II. hangars shall have an application rate of 0 17 gpm sq ft Quick response sprinkler heads . 6 9 lpm sq m over the hydraulically most remote A design density of 0 17 gpm sq ft 6 9 lpm sq m . 5 000 sq ft 464 5 sq m over 5 000 sq ft 464 5 sq m . The application rate for a closed head foam water, Foam System Application Summary. sprinkler system in a Group II hangar shall be 0 16 gpm . sq ft 6 5 lpm sq m over the entire aircraft storage. Overhead primary protection systems ,and servicing floor area . GROUP III HANGAR FIRE PROTECTION Discharge duration 10 min . REQUIREMENTS Application Rate , 0 16 gpm per sq ft AFFF through standard sprinkler.
Fixed fire protection systems are not normally required . If any hazardous operations such as fuel transfer 0 20 gpm per sq ft Protein Fluoroprotein or AFFF. welding painting torch cutting etc is performed in a. through air aspirating sprinkler heads , Type III hangar the hangar should be protected in. accordance with the requirements of a Type II aircraft If the foam concentrate is injected into the water. hangar supply by a foam pump there are to be two pumps. one main one reserve either of which can supply the. GROUP IV HANGAR FIRE PROTECTION necessary supply of foam concentrate at the design. REQUIREMENTS flow rate and operating pressure , When using a 1 type of foam concentrate multiply. The fire protection requirements of a Group IV hangar the total foam solution required by 0 01 to obtain the. may be defined as follows quantity of foam concentrate required Multiply by 0 03. when using a 3 type concentrate and by 0 06 when, A Where the hangar fire area is greater than 12 000 sq using 6 . ft 1 115 sq m and the aircraft are fuelled the fire. protection shall be in accordance with one of the,following . 1 A Low Expansion Low Level Foam System over, the whole storage and servicing area at 0 1 gpm.
sq ft 4 1 lpm sq m , 5, SUPPLEMENTARY PROTECTION SYSTEMS Flooding characteristics . Each Supplementary Fixed Foam Fire Protection System Cover 90 of the aircraft silhouette within 1 minute and. is to be designed to achieve control of the protected the whole hangar floor area to a depth of 1 metre 3 28. specified floor area within 30 sec of activation and to ft within 4 minutes . extinguish any fire within 60 sec The specified floor. area is the area under the wing and the wing center Safety Factors . section of the aircraft The different configurations of. aircraft and their positioning within the hangar must be The following approximate safety factors are applied to. considered for effective fire protection when positioning the design calculations Shrinkage is the normal effect of. the monitors If more than one aircraft is located within the foam collapsing under its own weight Sprinklers. any drainage system it is recommended that the discharging water directly on to the foam bubbles will. supplementary foam monitor system be capable of affect the foam blanket Leakage is as a result of. effectively covering the complete floor beneath all open windows doors or other non closing openings . Shrinkage 1 15 1 10 , Minimum flow rates through supplementary monitor Effect of Sprinklers 1 19 1 10 . systems for the area of coverage is to be 0 10 gpm per Leakage 3 00 1 15 . sq ft 4 1 lpm sq m when using AFFF and 0 16 gpm, per sq ft 6 5 lpm sq m when using Protein or Additional Requirements for all Types of aircraft. Fluoroprotein foam concentrates hangars , It is recommended that a control valve be installed at the Fire extinguishers must be distributed throughout the. Aircraft Maintenance Hangars or the U S Air Force ETL Engineering Technical Letter Fire Protection Engineering Criteria for Aircraft Maintenance Servicing and Storage Facilities Most commercial aircraft hangars throughout the world are designed in accordance with NFPA 409 A review of this standard

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