Water spray suppression of fully-developed wood crib fires in a compartment

Milke, James A.; Evans, David D.; Hayes, W. B.

doi:10.6028/nbs.ir.88-3745

Cited by 5 publications

(3 citation statements)

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“…Aspirated probes were used to reduce the influence of radiation and water spray on measured gas temperatures Ordinary, aspirated probes consist of a thermocouple bead placed inside a straight, constant internal diameter tube [5]. With a tube gas flow velocity of 7 m/s (21 ft/s) this type of probe has been found to draw water spray into the tube [6]. To minimize this effect, a flared tube tip, used in a previous set of water spray fire suppression tests [6], was also used in this study.…”

Section: Instriunentation and Data Acquisitionmentioning

confidence: 99%

“…With a tube gas flow velocity of 7 m/s (21 ft/s) this type of probe has been found to draw water spray into the tube [6]. To minimize this effect, a flared tube tip, used in a previous set of water spray fire suppression tests [6], was also used in this study. The design of the tip of the aspirated probe is shown in Figure 5.…”

Section: Instriunentation and Data Acquisitionmentioning

confidence: 99%

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Suppression of post-flashover compartment fires using manually applied water sprays

Stroup¹,

Evans²

1991

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A series of four full scale fire tests were conducted to measure the effect of manual fire fighting efforts on post-flashover room fires.One objective of these tests was to generate data for evaluation of computer models of the fire suppression process. The tests were conducted in a room and corridor configuration consisting of a 2.44 m cube burn room connected to a 12.8 m long, 2.44 m wide, and 2.44 m high corridor. Hose nozzles with different water spray flow rates and median drop sizes were used in each of the four nominally identical wood crib fires. Gas temperatures, wall surface temperatures and concentrations of oxygen, carbon dioxide, and carbon monoxide were measured in the burn room. Specialized aspirated and shielded thermocouples were used to minimize the effects of the water sprays on gas temperature measurements. This study showed that a water spray flow of 36.5 i/min with volume median drop size of 930 microns was just able to control the post-flashover fire, the flow of 16.3 £/min with volume median drop size of 800 microns did not control the fire, while the 79 £/min flow with volume median drop size of 1040 microns definitely extinguished the fire.

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Section: Instriunentation and Data Acquisitionmentioning

confidence: 99%

Section: Instriunentation and Data Acquisitionmentioning

confidence: 99%

Suppression of post-flashover compartment fires using manually applied water sprays

Stroup¹,

Evans²

1991

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“…Movement of such large volumes of steam and/or the resultant displacement of heated fire gases can adversely affect both occupants and firefighters [7][8][9]. Under certain flow conditions, there is also the potential for thermal imbalance in the compartment, bringing hot gases from the upper layers down towards the floor and onto the firefighter or other occupants [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Suppression Tactics on the Firefighter and Compartment Environment

Obach¹,

Weckman²,

Strong³

2011

Fire Safety Science - Proceedings of the 10th International Sym

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Full-scale experiments are conducted to study the effects of different water-based indirect initial attack methods on the compartment environment and firefighter during compartment fire suppression. Hot layer temperatures typical of room fire conditions are developed in the test compartment using wood cribs. Five suppression methods including straight stream, penciling, continuous wide and narrow fog, and a wide angle burst method are examined for two different spray angles and nozzle pressures. Temperatures, heat flux, gas velocity, and gas concentrations are monitored for the duration of the experiment in the fire compartment. Realistic, yet extreme, fire conditions are repeatedly established in the test compartment, with the fuel load allowing up to nine tests per fire. Differences in average compartment temperature before and during suppression indicate that penciling tactics provide little cooling of the compartment. In narrow fog attacks, the hot layer is pushed toward the floor, resulting in increased temperatures in the lower layer, generally an undesired result. Wide angle fog methods have greater impact on compartment temperature as compared to straight stream or narrow fog methods; however, they may also result in large increases in temperature at the firefighter. Wide angle burst tactics less effectively cool the compartment gases than continuous methods, but also lead to less impact on the firefighter. Greater numbers of bursts increase cooling of the compartment, but at the expense of increased impact on the firefighter. Including impact on the firefighter, continuous straight stream methods, at a nozzle pressure of 700 kPa and aimed to the top of the rear compartment wall, appear the best choice for initial attack on fires developed in these experiments. Due to variability between real fire scenarios and experiments such as these, significantly more study of the various suppression tactics is required before the most effective methods of suppression can be determined for a given set of fire scenarios.

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A study of tactical patterns during fire fighting operations

Svensson

2002

Fire Safety Journal

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Water spray suppression of fully-developed wood crib fires in a compartment

Cited by 5 publications

References 0 publications

Suppression of post-flashover compartment fires using manually applied water sprays

Suppression of post-flashover compartment fires using manually applied water sprays

Effects of Different Suppression Tactics on the Firefighter and Compartment Environment

A study of tactical patterns during fire fighting operations

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