Foreword: Most fire water supply fire fighting water, fire pumps need to be pressurized to meet the fire extinguishing on the water pressure and water requirements. Pump set due to improper maintenance failure will inevitably affect the fire and rescue, causing unnecessary losses. Recently, the repair shop in the vehicle maintenance process found that part of the vehicle due to inadequate maintenance of the pump system, vehicle equipment, equipment and equipment on duty. The main reason for the failure of the pump is not water for a long time the pump idle and impeller dry grinding conditions, resulting in serious pump wear and tear, mechanical seal Vice damage, resulting in a long time off the vehicle and bring maintenance costs increase. One of the main types of mechanical seal damage is overheating damage, mechanical damage. Overheating damage refers to the pump idling for a long time, dry friction, the formation of high temperature and pressure pump, suddenly open the canister door, the water flow through a sudden cooling, easy to cause thermal cracking and deformation of the mechanical seal. Mechanical damage refers to the water does not pass through the filter, solid particles invade the sealing surface, so that the soft sealing surface wear and tear damage, and frequent opening and closing the pump caused by the relative movement of mechanical seal wear and tear. It is understood that a total of five Beijing Fire Station liberation 7 flat diesel fire engines and 19 153 fire engines equipped with Luxembourg sub-pump equipped with mechanical seal pumps, the series is currently the pump manufacturers have been discontinued, the accessories are difficult to buy and expensive, only the original A set of mechanical seal value of more than 9,000 yuan, a set of processing have to reach 2,000 yuan. In order to save the maintenance cost and ensure the normal operation of the vehicle equipment, the repair shop shall draw up the maintenance of the pump from the maintenance point of view. First, water must be added to the water tank from the tank to prevent the solid gravel, stones, etc. Enter the water pump; Second, regular cleaning jugs, pumps, debris; Third, to strengthen pump operation skills training to avoid misuse. Fourth, daily to open and close the pump system section door, to avoid the door rust rust; Fifth, timely and timely to the pump, vacuum pump, throttle and other filling grease to avoid damage to the parts; pump running `` 3-6 hours later, Pump grease to the pump once. Sixth, the diversion time is less than 40 seconds; seven is the long-term use of the pump to open an additional cooling system to ensure that the engine, power take-off will not overheating damage. When using the cooling system, you need to open the inlet valve, close the bleed valve, and often check the power take-off pipe loop to see if there is leakage, to avoid power take-off oil dilution bearings. Q: Is it necessary to set up a special fire pump in the multi-storey building? Answer: Article 8.6.3 of "Code for Fire Protection of Building Design" (hereinafter referred to as "Construction Regulations") stipulates: "For buildings with temporary high-pressure water supply system, fire water tanks or pressure water tanks and water towers shall be set up." 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 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. A: Fire pump is an important equipment for fire fighting and rescue, which plays an extremely important role in fire fighting. 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 for fire-fighting water should be fully ensured because of the negligible loss of equipment from the loss of fire due to the possible damage caused by the overload of the pump. However, even in the actual construction of some standard construction atlas, including the current teaching materials in colleges and universities described in the fire pump electrical diagram, the fire pump circuit is still equipped with overload protection cut off electrical appliances, such as "Building Electrical Installation Engineering 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. Q: How to lay the fire pump line? A: In many design drawings found: fire pumps for power distribution lines, control lines and more wear PVC pipe protection, 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 they are concealed, the "Code for Design of Electrical Installations for 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. B650Mm Belt Conveyor,Roller Belt Conveyor,Mini Conveyor Belt,Industrial Belt Conveyor Yantai Sino Touch Mining & Construction Equipment Co.,Ltd , https://www.stmcgroup.com
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Q: Should the fire pump overload protection?