After the fire pump automatic inspection starts, the pressure gauge shows no reading and the pump delivers no water, resulting in the fire protection pipe network being without water for a long time.
Fire pumps are the core power equipment of the hydrant system and sprinkler system, and their performance directly determines the actual firefighting capability of the fire protection system. Section 5.1 of GB 50974-2014 "Technical Code for Fire Water Supply and Hydrant Systems" contains detailed provisions on fire pumps. GB 6245-2006 "Fire Pumps" specifies the technical requirements and test methods for fire pumps. Problems in pump selection, installation and maintenance may cause failure to start properly in a fire.
In fire pump selection, the flow rate shall be not less than 10 L/s for the hydrant system, the head shall meet the working pressure requirement at the most unfavorable point, and the motor power margin shall be not less than 10%. The duty pump and standby pump shall be in a one-duty-one-standby configuration with automatic changeover, and the changeover time shall not exceed 15 s. The pump characteristic curve shall operate in the high-efficiency zone and shall not exhibit a hump. Self-priming (flooded) suction shall be adopted to ensure automatic water filling at startup. The submergence depth of the suction bell mouth shall be not less than 600 mm.
The pump discharge pipe shall be provided with a check valve, gate valve and pressure gauge. Vibration isolation measures include rubber vibration isolation pads and flexible rubber joints. The automatic inspection device shall automatically run for 2 to 3 minutes weekly to prevent corrosion. Control modes are divided into three types: automatic start (hydrant button directly starts the pump), manual start (remote start/stop from the fire control room) and mechanical emergency start (local manual operation at the control cabinet). Multi-wire start/stop buttons shall be provided in the fire control room.
Construction acceptance requirements: the pump foundation shall be not less than 100 mm above the floor with a drainage trench around it. Limit devices shall be provided at the flexible sections of pipe connections. The pressure gauge range shall be 1.5 to 2 times the working pressure. Test the rated flow and head of each pump individually and record the performance curve. For linkage acceptance, simulate a fire signal to check automatic start and duty/standby pump changeover. The starting pressure shall be not less than 0.05 MPa.
Automatic inspection weekly; manual start and run for more than 5 minutes monthly. Test automatic duty/standby pump changeover and remote start/stop quarterly. Clean the strainer and lubricate the bearings every six months. Carry out a comprehensive annual overhaul including coupling alignment, bearing replacement and mechanical seal replacement. Common problems include: pump fails to self-prime (insufficient water level at the suction inlet or air trapped in the suction pipe), no water after startup (incorrect phase sequence or valve not open), excessive vibration (loose anchor bolts or cavitation).
Engineering experience requires the fire pump room to be provided with a drainage trench and sump pit to prevent flooding. The suction pipe velocity shall be controlled at 1.0 to 1.2 m/s and the discharge pipe velocity at 1.5 to 2.0 m/s. Provide not less than 0.8 m of operating space in front of the control cabinet. Post the pump model and parameters on site. It is recommended to select products of the same brand and series to simplify spare parts management.
Regular maintenance and testing of fire pumps are the basis for ensuring their reliability. The monthly manual start test shall record the starting time, running current, inlet and outlet pressures and vibration data. When the automatic inspection device runs automatically each week, check whether its start/stop logic is normal. The electrical control cabinet of the fire pump shall be regularly cleaned of dust and its terminals tightened, and the contactor contact wear shall be checked. The phase sequence marking in the wiring diagram shall be clearly visible, and the phase sequence protector function shall be tested quarterly. Hotel property management shall include fire pump maintenance in the contract scope with a professional fire protection maintenance company; the maintenance contractor shall provide a system operation report monthly and conduct a comprehensive functional test quarterly. Fire pump spare parts such as mechanical seals, bearings and contactors shall be stocked on site to ensure rapid repair in case of failure and minimize system downtime.
Fire pump selection shall fully consider the actual water demand of the building and the water source conditions. When drawing water directly from the municipal network, verify whether the supply capacity of the municipal network meets the suction requirements of the fire pump. When a fire water tank is used, ensure that the effective volume of the tank meets the total fire water demand during the fire duration. The installation height of the fire pump shall meet the flooded suction requirement, and the pump axis shall not be higher than 7 m above the lowest water level of the fire water tank. The suction pipe layout shall avoid air pockets, and the pipe shall rise gradually toward the pump with a slope of not less than 0.005. The check valve on the fire pump discharge pipe shall be a slow-closing check valve to prevent water hammer impact on the piping system. The automatic inspection device of the fire pump shall have a low-frequency low-speed operation function to avoid corrosion and seizure caused by long-term standstill of the pump. The control cabinet of the fire pump shall have three control modes: manual, automatic and mechanical emergency start; the mechanical emergency start device shall be able to start the pump directly when the control cabinet fails. The performance curve and operating point of the fire pump shall be marked on the nameplate for reference by commissioning and maintenance personnel. Through comprehensive selection and design, strict installation and construction, and standardized maintenance management, ensure that the fire pump can start reliably and operate normally in a fire.
Fire pump selection shall fully consider the actual water demand of the building and the water source conditions. When drawing water directly from the municipal network, verify whether the supply capacity of the municipal network meets the suction requirements of the fire pump. When a fire water tank is used, ensure that the effective volume of the tank meets the total fire water demand during the fire duration. The installation height of the fire pump shall meet the flooded suction requirement, and the pump axis shall not be higher than 7 m above the lowest water level of the fire water tank. The suction pipe layout shall avoid air pockets, and the pipe shall rise gradually toward the pump with a slope of not less than 0.005. The check valve on the fire pump discharge pipe shall be a slow-closing check valve to prevent water hammer impact on the piping system. The automatic inspection device of the fire pump shall have a low-frequency low-speed operation function to avoid corrosion and seizure caused by long-term standstill of the pump. The control cabinet of the fire pump shall have three control modes: manual, automatic and mechanical emergency start; the mechanical emergency start device shall be able to start the pump directly when the control cabinet fails. The performance curve and operating point of the fire pump shall be marked on the nameplate for reference by commissioning and maintenance personnel. Through comprehensive selection and design, strict installation and construction, and standardized maintenance management, ensure that the fire pump can start reliably and operate normally in a fire. Energy-efficient operation of fire pumps is also an aspect worthy of attention. Although fire pumps do not operate frequently in normal times, the electrical energy consumed by their automatic inspection devices running 2 to 3 minutes weekly cannot be ignored. Fire pumps equipped with variable-frequency inspection devices can adjust the inspection operating frequency according to actual needs to reduce energy consumption. The annual full-load test of the fire pump can be carried out when the water level of the fire water tank is low, combining the discharge of test water with green area irrigation to achieve water reuse. The ventilation and heat dissipation design of the fire pump room is equally important; the heat generated by motor operation needs to be removed promptly by mechanical ventilation. The lighting in the pump room shall use explosion-proof luminaires to meet the safety requirements of damp locations. Fire pump spare parts management shall cover key components such as bearings, mechanical seals, impellers and couplings; spare parts shall be stored by category and specification in separate areas with clear identification. The annual maintenance plan for fire pumps shall be refined to each quarter and each month, and the maintenance content and frequency shall comply with the manufacturer's recommendations and code requirements.
Energy-efficient operation of fire pumps is also an aspect worthy of attention. Although fire pumps do not operate frequently under normal conditions, the electricity consumed by their automatic inspection devices running 2 to 3 minutes per week cannot be ignored. Fire pumps equipped with variable-frequency inspection devices can adjust the inspection operating frequency according to actual needs to reduce energy consumption. The annual full-load test of fire pumps can be conducted when the water level in the fire water tank is low, combining the discharge of test water with landscape irrigation to achieve water resource reuse. The ventilation and heat dissipation design of the fire pump room is equally important; the heat generated by motor operation needs to be promptly removed through mechanical ventilation. The spare parts management for fire pumps should include key components such as bearings, mechanical seals, impellers and couplings. The annual maintenance plan for fire pumps should be refined to each quarter and each month. Remote monitoring of fire pumps is also an important means of modern management. By installing intelligent terminals in the pump control cabinet, the operating status, current, voltage and pump inlet and outlet pressures can be monitored in real time, and the data is uploaded to the cloud platform via the Internet of Things. When a pump fault occurs, the platform automatically pushes alarm information to the mobile phones of relevant management personnel. The remote monitoring system can improve the management efficiency of fire pumps and reduce manual inspection costs. Emergency operation training for fire pumps is the foundation for ensuring correct operation during a fire. Relevant personnel from the hotel engineering department and security department should receive fire pump operation training, covering pump control cabinet operation, starting and stopping pumps, manual/automatic switching, main/standby pump switching and common fault handling. Emergency operation drills for fire pumps should be conducted every six months, with drill scenarios including automatic startup failure during a fire, main/standby pump switching failure and remote pump startup failure. Through comprehensive training, drills and emergency preparation, ensure that fire pumps can be correctly operated during a fire.
Remote monitoring of fire pumps is also an important means of modern management. By installing intelligent terminals in the pump control cabinet, the operating status, current, voltage and pump inlet and outlet pressure data can be monitored in real time and uploaded to the cloud platform via the Internet of Things. When a pump fault occurs, the platform automatically pushes alarm information to the mobile phones of relevant management personnel. The remote monitoring system can improve the management efficiency of fire pumps and reduce manual inspection costs. Emergency operation training for fire pumps is the foundation for ensuring correct operation during a fire. Relevant personnel from the hotel engineering department and security department should receive fire pump operation training, covering pump control cabinet operation, starting and stopping pumps, manual/automatic switching, main/standby pump switching and common fault handling. Emergency operation drills for fire pumps should be conducted every six months, with drill scenarios including automatic startup failure during a fire, main/standby pump switching failure and remote pump startup failure. The emergency response plan for fire pumps should clearly define countermeasures and responsible persons for various fault conditions. Emergency spare parts for fire pumps should be stored on site in a quantity of no less than one set to ensure rapid replacement and functional recovery in the event of a fault. Through comprehensive training, drills and emergency preparation, ensure that fire pumps can be correctly operated and promptly maintained during a fire.
The selection of fire pumps should fully consider the actual water demand of the building and the water source conditions. When drawing water directly from the municipal network, the supply capacity of the municipal network should be verified. When a fire water tank is used, the effective volume of the tank should be ensured to meet the total fire water demand during the fire duration. The installation height of fire pumps should meet the requirements for self-priming (flooded suction) water intake. The layout of suction pipes should avoid the formation of air pockets, and the pipes should gradually rise toward the pump. The check valve on the fire pump discharge pipe should be a slow-closing check valve to prevent water hammer impact. The control cabinet of fire pumps should have three control modes: manual, automatic and mechanical emergency startup. Through comprehensive selection and design, installation and construction, and standardized maintenance management, ensure that fire pumps can start reliably and operate normally during a fire, safeguarding the fire safety of the building.