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Discussion on common problems of fire pump
First, the multi-storey building is necessary to set up a special fire pump "Architectural Design Code of Fire Prevention" (hereinafter referred to as "Construction Regulations") Article 8.6.3 states: "The establishment of temporary high-pressure water supply system should be set fire water tank or pressure Jug, water tower. " According to this provision, the establishment of temporary high-pressure fire water supply systems should be set fire water tank. This type of building is mostly a multi-storey building of 4,5 storeys, while the pressure of the municipal pipe network is generally 20-30 meters water column. In order to meet the needs of the most unfavorable point hydrant required substantial water column, such buildings should also be set fire pump. However, the purpose of providing indoor fire hydrant system in multi-storey buildings is only for fighting the initial fires. A large amount of rescue work also depends on the urban fire brigade. Therefore, it is inevitable to set fire-fighting pumps wastefully. For this type of building, I do not know whether it is possible to learn from the high-rise building in the fire water tank outlet pipe set supercharging facilities practice, the fire water tank outlet pipe set through the fire hydrant box button or by the fire water tank outlet indicator Start booster pump to meet the need to enrich the water column. This approach, booster pump set in the roof, is light-load start, start fast, the initial fire fighting should be beneficial. In addition, municipal pipe network to meet the indoor and outdoor fire water on the premise, I do not know whether to consider depending on the building for different purposes to determine whether to set the fire pump. That is, in the factory buildings and large public buildings, the establishment of a fire pump to promote self-help capacity to some extent, while in the general residential area, it allows no fire pump, the fire pump using water pump adapter in the outdoor water After all, even if a fire pump is installed in a residential building, residents may not be able to use it properly. Fire pump performance and test requirements Fire pump and life pump and pump production performance should have higher requirements, but the current norms of our fire pump performance and test requirements did not make more detailed provisions, resulting in There is no evidence of fire pump in use, there have been many problems. US NFPA20 fire pump performance requirements are: fire pump maximum flow should be 150% of the design value, the lift is not less than 65% of the selected working point lift, shut down the pump lift is not greater than 140% of the selected work point lift, , The regulator pump flow is 1-2L / S, lift for the fire pump head 1.1-1.2 times. At the same time the provisions of the fire pump outlet pipe should be set to measure the flow meter, the flow meter should be able to test the pump selected flow of 175%, the fire pump on the outlet pipe should be set diameter greater than 89mm pressure gauge. Suggest that the relevant departments of the reference to the United States standards for fire pump design, selection of more targeted, more specific requirements, so that the fire pump selection, testing is well documented. Third, the laying of the pump line found in many design drawings: fire pump for power distribution lines, control lines and more wear PVC pipe to protect, and from the ceiling within the alignment. I think this alignment method is defective. Although the "Construction Regulations" only require that the power distribution lines of fire-fighting electrical equipment be worn with metal pipes and no metal pipe protection is required when concealed, the "Code for Design of Electrical Buildings in Civil Buildings" (hereinafter referred to as "the Civil Regulation") 24.8. 5 requirements: fire linkage control, automatic fire control and other lines should be used flame retardant cable to wear the pipe in the non-burning body structure layer, the protective layer thickness of not less than 3cm, when it must be clear, should be on the metal pipe Take fire precautions. Article 8.2.2 of "Code for Design of Automatic Fire Alarm System" (hereinafter referred to as "automatic alarm specification") also makes corresponding provisions in this regard. We know that fire pumps still have a role to play for some time after a fire broke out, to complete the construction fire fighting efforts. Therefore, in this period of time, still to ensure the safety of the pump line. For the distribution room and the electric shaft distance farther, fire power equipment capacity larger, the line can not be concealed, you can take effective fire prevention measures laid in the ceiling. In this case should avoid the use of fire-resistant slot box, because the ceiling is also fire-prone lots, the laying of the line in the ceiling fire and unsafe, and the tank can only prevent the external combustion of the line damage, can not prevent the line box Fire caused by its own failure. Fire pumps and other important fire-fighting equipment recommended fire-resistant cable power supply to ensure that in case of fire can be affected within a certain period of time to continue to work. Fourth, fire pumps should be set over-load protection Fire pump is an important fire-fighting equipment, fire fighting plays an extremely important role. According to our habitual thinking, overload protection should be provided for all important equipment. However, Articles 8.6.3.5 and 10.2.2.4 (3) of the "Regulations" stipulate: "For a power distribution line that causes a more serious loss than an overload due to a sudden power failure, it should not be installed Load protection electrical appliances (such as fire pumps, power supply lines), but should be installed overloaded alarm appliances. As such, fire pumps should not be installed overload protection cut off device. This is mainly due to the fact that when a fire breaks out, the need to use fire-fighting water should be fully ensured because equipment loss due to overloading of the pump is negligible compared to the loss of fire. But in engineering practice even in some standard construction atlas, including the current teaching materials in colleges and universities to introduce the fire pump electrical diagram, the fire pump circuit is still equipped with overload protection cut off electrical appliances, such as "Building Electrical Installation Project Atlas JD13- 318 page "high-rise building fire protection system full voltage start fire pump control device (b)". This obviously does not meet the regulatory requirements.