Chapter 8 Flashcards
NFPA 1971 specifies the minimum design, performance, testing, and certification requirements for structural firefighting protective ensembles and ensemble elements that include garments, helmets, gloves, footwear, and interface components.
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Helmet ear covers, hoods, and other interfaces should have an average TPP of not less than 20.
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Heat fluxes due to direct flame contact have been measured in the range of 5.28 Btu/ft2 to 14.96 Btu/ft2.
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The item to be tested is exposed to the flame for approximately 12 to 15 seconds. After that exposure, garment materials should not have a char length of more than 4 in., should not have an afterflame of more than 2.0 seconds, and should not melt or drip.
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Helmets have limits on the amount of distortion acceptable after an exposure and are allowed up to 5 seconds for afterflame or glow.
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All sewing thread utilized in the construction of garments, DRDs, helmets, boots, and interface components should be tested for resistance to melting and should not melt at or below 500*F.
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For footwear, the sole of the boot is placed on the hot plate for 20 minutes. During that period, temperature of the insole surface in contact with the foot should not exceed 111*F.
Afterflame of no more than 5 seconds.
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25 seconds for second degree burns in knee and shoulder areas.
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Based on the tests that the PPE must pass, the gear is intended to survive temperatures of at least 500*F for 5 minutes.
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Second degree burns to the skin can occur when the skin temperature reaches 135*F.
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During the test, no components of the scba may fail or separate from the assembly, no afterflame can be sustained longer than 2.2 seconds, and positive pressure must be maintained within the facepiece throughout the test.
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The facepiece is required to maintain a positive pressure air supply within certain limits for a total of 24 minutes.
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The nozzle should be capable of operation after storage in high temperatures of 135F and after storage in low temperatures, with a dry nozzle, of -25F for 24 hours.
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The air-oven aging test exposes the nozzles to 158F for 180 days and then allowed to cool at least 24 hours in air at 74F at 50% relative humidity.
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Ladders (NFPA 1931) - Minimal thermal requirements at 300*F must retain 75 percent of the strength necessary to pass all test requirements.
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