[Fire fighting knowledge points] Can the fireproof coating on the surface of smoke control pipe meet
3.3.8The setting and fire endurance of mechanical pressurized air supply pipes shall comply with the following provisions:
1 The vertical air supply pipe shall be independently set in the pipe shaft. When it is really difficult, the fire resistance of the air supply pipe not set in the pipe shaft or shared with other pipes shall not be less than 1.00h;
2 When the horizontal air supply pipe is set in the ceiling, its fire resistance limit shall not be less than 0.50h; When it is not set in the ceiling, its fire resistance limit shall not be less than 1.00h.
4.4.8 The setting and fire endurance of smoke exhaust pipe shall meet the following requirements:
1 The smoke exhaust pipe and its connecting parts shall be able to ensure its structural integrity at 280 ℃ for 30 minutes continuously.
2 The smoke exhaust pipe set vertically shall be set in an independent pipe shaft, and the fire resistance limit of the smoke exhaust pipe shall not be less than 0.50h.
3 The horizontal smoke exhaust pipe shall be set in the ceiling, and its fire resistance limit shall not be less than 0.50h; When it is really difficult, it can be directly set indoors, but the fire resistance limit of the pipeline shall not be less than 1.00h.
4 The fire endurance of the smoke exhaust pipes set in the ceiling of the walkway and the smoke exhaust pipes passing through the fire compartment shall not be less than 1.00h, but the fire endurance of the smoke exhaust pipes in equipment rooms and garages may not be less than 0.50h.
2. Eight sets of thermocouple sensors are set to monitor the change of air duct temperature. Two situations are simulated: one is the fire resistance limit of the air duct after being heated outside in case of indoor fire; The other is the fire resistance limit of the air duct after it is heated (for example, the exhaust pipe discharges hot flue gas).
3. After the test, the average temperature rise inside the air duct in the furnace exceeded the initial temperature by 140 ℃ in 25 minutes and 21 seconds, and the average temperature rise outside the furnace exceeded the initial temperature by 140 ℃ in 29 minutes and 48 seconds.
4. If the temperature rise of the back fire surface of the test piece exceeds any of the following limits, the test piece shall be deemed to have lost its thermal insulation: the average temperature rise exceeds the initial average temperature by 140 ℃; Or the temperature rise at any point exceeds the initial temperature (including moving thermocouple) by 180 ℃ (the initial temperature shall be the initial average temperature of the backfired surface at the beginning of the test). It can be seen that the fire resistance and thermal insulation of the test piece is less than 0.5h, which does not meet the specification requirements.
5. At present, two tests have been carried out, one is to select the general fire retardant coating on the market, the other is to select the fire retardant coating with good quality on the market, and the results are unqualified. It is reported that two more tests will be carried out in the future. If each test is unqualified, this practice will be limited in the subsequent construction project fire inspection according to the research results.
4、 At present, there is no fire retardant coating specially used for smoke control and exhaust pipes. Perhaps with the progress of society and the development of fire protection, relevant standards and products will become increasingly perfect, and the above problems will be solved.
The article is reproduced from official account "fire fighting root"
©Ningbo Guorun Pipe Industry Co., Ltd
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