1. Fire water supply system.
The fire water supply system is divided into three forms: high-pressure fire water supply system, temporary high-pressure fire water supply system and low-pressure fire painting system.
1) High-pressure fire water supply systemThe high-pressure fire water supply system can always meet the working pressure and flow required by the water fire extinguishing system, and there is no need to open the fire pump when the fire occurs. The system can supply water to any water extinguishing system.
2) Temporary high-pressure fire water supply system.
The temporary high-pressure fire water supply system can not meet the working pressure and flow required by the water fire extinguishing system, and the fire pump needs to be started when the fire occurs. The system can also supply water to any water extinguishing system.
3) Low-pressure fire water supply system.
When a fire occurs, the fire rescue personnel open the nearest outdoor fire hydrant, connect the fire truck with the outdoor fire hydrant, suck water from the outdoor pipe network and join the fire truck, and then use the fire truck to directly pressurize the fire extinguisher, or the fire truck pressurizes the water supply to the indoor pipe network through the pump adapter. Low-pressure fire water supply system should be used outdoors of the building, when the municipal water supply pipe network is used for water supply, two fire water supply should be used, except for the building height of more than 54m residence, the design flow of the outdoor fire hydrant is less than or equal to 20L S can be used when the fire water supply water supply can be used, and the outdoor fire hydrant should be directly supplied by the municipal water supply pipe network.
Fire water supply facilities include fire water sources (fire pools), fire pumps, fire water supply pipelines, pressure increasing (stabilizing) equipment (fire pressure tanks), fire pump adapters and fire water tanks.
2. Fire pumps.
The fire water pump is to transfer energy to the water through the rotation of the impeller, thereby increasing the kinetic energy and pressure energy of the water, and transporting it to the fire extinguishing equipment to meet the water volume and water pressure requirements of various fire extinguishing equipment, it is the heart of the fire water supply system. At present, most of the pumps used in the fire water supply system are centrifugal pumps, because this kind of water pump has the advantages of wide application range, many models, continuous water supply, and adjustable flow at will.
a) Set requirements.
Fire pumps need to be set up in the temporary high-pressure fire water supply system and the high-pressure fire water supply system. In the series fire water supply system and gravity fire water supply system, in addition to the fire pump, the fire transfer pump is also required to be set up to lift the water source to the intermediate water tank or the fire high water tank. The fire hydrant water supply system and the automatic sprinkler system should be set up separately with the fire pump, and when the fire pump is shared with the fire hydrant system, the system pipeline should be separated in front of the alarm valve.
When setting up fire water pumps and fire transfer pumps, standby pumps should be set up, and their performance should be consistent with the performance of working pumps. The sprinkler system can set up a backup pump in the ratio of "use one to reserve one" or "use two to reserve one". According to the provisions of the "Technical Specifications for Fire Water Supply and Fire Hydrant Systems GB50974-2014", the standby pump can not be set under the following circumstances:
1) Residential buildings with a building height of less than 54m and buildings with a design flow rate of less than or equal to 25 l s for outdoor fire water supply.
2) Buildings with a design flow rate of less than or equal to 10L s for indoor fire water supply.
2) The selection of fire pumps.
The selected fire pump products should comply with the provisions of the "Fire Pump" (GB6245-2006) and pass the test of the National Fire Protection Equipment Quality Supervision and Inspection Center.
1.The relevant requirements for the flow rate and head of the fire pump.
1) The performance of the fire pump should meet the requirements of the flow and pressure required by the fire water supply system.
2) The power of the driver equipped with the fire pump should meet the requirements of the power required for operation at any point on the flow head performance curve of the selected pump.
3) When using a fire pump driven by an electric motor, a fire pump with a dry installation of the motor should be selected.
4) The flow head performance curve should be a smooth curve without hump and inflection point, and the pressure at zero flow should not be greater than 140% of the design working pressure, and should be greater than 120% of the design working pressure.
5) When the outflow rate is 150% of the design flow, the outlet pressure should not be lower than 65% of the design working pressure
6) The sealing method and material of the pump shaft should meet the requirements of the fire pump in low flow operation, 7) The fire pump model of the same pump group should be the same, and the working pump should not exceed 3 units.
8) When multiple fire pumps are connected in parallel, the influence of flow superposition on the outlet pressure of the fire pump should be checked.
2.Relevant regulations on the main materials of fire pumps.
1) The shell of the water pump should be ductile iron.
2) The impeller should be bronze or stainless steel.
3.Relevant regulations of diesel engine fire water pump.
1) The diesel engine fire pump should be a compression ignition diesel engine.
2) The rated power of the diesel engine should check the influence of altitude and ambient temperature on the power of the diesel engine.
3) The diesel engine fire pump should have continuous working performance, and the test operation time should not be less than 24h
4) The battery of the diesel engine fire pump should ensure that the fire pump automatically starts the pump at any time.
5) The fuel supply tank of the diesel engine fire pump should be determined according to the fire continuation time, and the minimum effective volume of the fuel tank should be 1With 5L kW configuration, the fuel stored in the fuel tank of the diesel engine fire pump should not be less than 50% of the reserves.
4.Relevant regulations on the installation of axial deep well pumps.
1) When the axial flow deep well pump is installed in the well, its submerged depth should meet the requirements of its reliable operation, and when the pump outflow rate is 150% of the design flow, its minimum submerged depth should be not less than 32m, and for every 300m increase in elevation, the minimum submerged depth of the deep well pump should be increased by at least 03m。
2) When the axial flow deep well pump is installed on the fire water source such as the fire water pool, the bottom of the first water pump impeller should be the lowest effective water line of the fire water pool, and the inundation depth should be calculated and determined according to the hydraulic conditions, and the effective water storage or effective water level of the fire water source such as the fire water pool should be fully utilized; When the design flow of the pump is greater than 125L, the inundation depth should be determined according to the performance of the pump, and the requirements of the cavitation allowance of the pump should be met.
3) The connection between the outlet pipe of the axial deep well pump and the fire water supply pipe network shall comply with the relevant provisions of the Technical Code for Fire Water Supply and Fire Hydrant System (CB50974-2014).
4) The valve setting of the outlet pipe of the axial flow deep well pump shall comply with the relevant provisions of the Technical Code for Fire Water Supply and Fire Hydrant System (CB50974-2014).
5) When the minimum water level of the fire water pool is lower than the center line of the centrifugal water pump outlet pipe or the water source water level cannot ensure that the centrifugal water pump can absorb water, the axial flow deep well pump can be used, and the installation method of wet deep pit should be installed on the fire water source such as the fire water pool.
6) When the motor of the axial flow deep well pump is set in the open air, it should have a rainproof function.
7) Others should comply with the relevant provisions of the "Outdoor Water Supply Design Standards" (GB50013-2018), and 3) the series and parallel connection of fire pumps.
The series connection of fire pumps is to directly connect the outlet of one pump with the suction pipe of the other pump, and the two pumps run at the same time. The series connection of the fire pump can increase the head when the flow rate is constant, so when the head of a single fire pump can not meet the water pressure requirements of the sprinkler head at the most unfavorable point, the system can use the series fire water supply system. The series connection of fire pumps should be the same model and the same specification of fire pumps. In terms of control, the front fire pump should be turned on first, and then the back (according to the direction of water flow) fire pump should be turned on. When conditions permit, multistage pumps should be used as much as possible. The parallel connection of fire pumps refers to the supply of water to the fire water supply system by two or more fire pumps at the same time. The function of the parallel connection of fire pumps is mainly to increase the flow rate, but when the flow is superimposed, the flow rate of the system will decrease, and this factor should be considered when selecting the pump. That is to say, the total flow rate of parallel work has increased, but the flow rate of a single fire pump has decreased, so the flow rate of a single fire pump should be appropriately increased. When parallel connection, it is also advisable to choose the same model and specification of the fire pump, so that the water pressure of the fire pump is equal and the working state is stable.
4) Water suction of fire pumps.
Depending on the characteristics of the centrifugal pump, the vane pool wheel must be submerged in water when the pump is started. In order to ensure the timely and reliable start of the fire pump, the suction pipe should be self-filling (as shown in Figure 3-2-1), that is, the elevation of the pump shaft should be lower than the minimum available water level of the water source. When self-filling water absorption, a valve should be installed on the suction pipe for easy maintenance.
1) The fire pump should be self-filling and suctioning.
2) When the fire pump directly pumps water from the municipal pipe network, a backflow preventer with an air partition should be set on the outlet pipe of the fire pump.
3) When there is no suction well at the water suction port, a swirl preventer should be set at the water suction port.
5) Requirements for the layout of fire pump pipelines.
1.Requirements for the layout of the suction pipe of the fire water pump.
The suction pipe of the fire pump should be guaranteed to be air-tight, and the following points should be paid attention to when arranging:
1) A group of fire pumps, there should be no less than two suction pipes, when one of them is damaged or overhauled, the rest of the suction pipes should still be able to pass through all the design flow of fire water supply.
2) The suction pipe of the fire pump should be arranged to avoid the formation of air bags.
3) The inundation depth of the suction port of the fire pump should meet the requirements of the safety of the operation of the fire pump at the lowest water level, and the submersion depth of the suction pipe bell mouth at the minimum effective water level of the fire pool should be determined according to the water flow speed and hydraulic conditions of the suction pipe bell, but should not be less than 600mm, and the inundation depth should not be less than 200 mm when the cyclone preventer is adopted.
4) The suction pipe of the fire pump should be provided with an open rod gate valve or a butterfly valve with a self-locking device, but when a dark rod valve is set, an opening scale and a sign should be provided; When the pipe diameter exceeds DN300, it is advisable to set up an electric valve.
5) When the diameter of the suction pipe of the fire pump is less than DN250, its flow rate should be 1 12m/s;When the diameter is greater than DN250, the flow velocity should be 12~1.6 m/s。
6) The layout of the suction well should meet the requirements of smooth water flow, uniform flow rate and no vortex in the well, and should be convenient for installation and construction.
7) When the suction pipe of the fire pump passes through the fire pool, a flexible casing should be used; When the rigid waterproof casing is used, a flexible joint should be set on the suction pipe of the water pump, and the pipe diameter should not be greater than DN150.
8) The suction pipe of the fire pump can be equipped with a pipeline filter, and the water area of the pipe filter should be greater than 4 times of the water area of the pipeline, and the hole diameter should not be less than 3mm.
9) There should be no air bags and air leakage on the horizontal pipe section of the suction pipe of the fire pump. When reducing connection, eccentric reducer fittings should be used and pipe top flush connection should be used.
2.Arrangement of fire pump outlet pipes.
The outlet pipeline of the fire pump should be able to withstand a certain pressure to ensure that there is no water leakage, and the following should be paid attention to in the layout.
1) A group of fire pumps should be set up with no less than two water main pipes and fire water supply ring pipe network connection, when one of the water pipes overhauled, the rest of the water pipes should still be able to ** all the fire water supply design flow.
2) Check valves and open rod gate valves should be set on the outlet pipe of the fire pump; When butterfly valves are used, they should be equipped with self-locking devices; When the pipe diameter is greater than DN300, it is advisable to set up an electric valve.
3) When the diameter of the outlet pipe of the fire pump is less than DN250, its flow rate should be 15~2m/s;When the diameter is greater than DN250, the flow rate should be 2 25 m/s。
4) Silencer check valves, control valves and pressure gauges should be installed on the outlet pipe of the fire pump; Pressure gauges and pressure switches should also be installed on the total water outlet of the system; A buffer device should be added when installing the pressure gauge. A should be installed between the pressure gauge and the buffer device; When there is no design requirement for the pressure gauge range, it should be 2 2 of the working pressure of the system5 times.
3.Requirements for the setting of pressure gauges on the suction pipe and outlet pipe of the fire pump.
1) The maximum range of the pressure gauge of the outlet pipe of the fire pump should not be less than 2 times of its designed working pressure, and should not be less than 16 mpa。
2) The suction pipe of the fire pump should be set up with a vacuum gauge, a pressure gauge or a vacuum pressure gauge, and the maximum range of the pressure gauge should be determined according to the specific situation of the project, but should not be less than 07 MPa, the maximum range of the vacuum gauge should be -01mpa
3) The diameter of the pressure gauge should not be less than 100mm, and the pipe with a diameter of not less than 6mm should be connected to the inlet and outlet pipes of the fire pump, and a shut-off valve should be set.
4.Flow and pressure testing setups.
A group of fire pumps shall be equipped with flow and pressure testing devices in the fire pump room, and shall comply with the following regulations.
1) The flow rate of a single fire pump is not more than 20 l s, and the design working pressure is not more than 0When 5 MPa, the pump set should reserve the flow meter and pressure gauge interface for measurement, and other pump sets should be equipped with pump set flow and pressure test devices.
2) The measurement accuracy of the fire pump flow detection device should be 0Level 4, 75% of the maximum range should be greater than 175% of the design flow value of the largest fire pump.
3) The measurement accuracy of the fire pump pressure detection device should be 0In the 5th stage, 75% of the maximum range should be greater than 165% of the design pressure value of the largest fire pump.
4) A test pipe of DN65 should be set on the outlet pipe of each fire pump, and drainage measures should be taken, and 6) the starting device and power device of the fire pump.
1.The starting device of the fire pump.
1) The fire pump should be able to start and stop manually and start automatically, and it should be ensured that the automatic start time from receiving the pump start signal to the normal operation of the pump is not more than 2min. The fire pump should not be equipped with the control function of automatic pump stop, and the pump stop should be determined by the staff with management authority according to the fire fighting situation.
2) The fire pump should be directly and automatically started by the pressure switch set on the main pipe of the fire pump, the flow switch on the outlet pipe of the high-level fire water tank or the pressure switch of the alarm valve. The pressure switch in the fire pump room should be introduced into the fire pump control cabinet.
3) The fire hydrant button should not be used as a switch to directly start the fire pump, but it can be used as a switch to send an alarm signal or a quick opening and closing device to start the dry fire hydrant system.
4) The pressure stabilizer pump should be controlled by the automatic start-stop pump pressure switch or pressure transmitter of the pressure stabilizer pump set on the fire water supply pipe network or pneumatic water tank.
2.Requirements for the setting of the control cabinet of the fire pump.
The fire pump control cabinet shall be set up in the fire pump room or the special fire pump control room, and shall meet the following requirements:
1) The fire pump control cabinet should make the fire pump in the automatic start state.
2) When the automatic water extinguishing system is an open system, and it is difficult to set up automatic start, the fire pump can be set in the manual start state after demonstration, and it should be ensured that there are people on duty 24 hours a day.
3) When the fire pump control cabinet is installed in the special fire pump control room, its protection level should not be lower than IP30; When installed in the same space as a fire pump, its protection level should not be lower than IP55.
4) The control cabinet of the fire pump should take measures to prevent it from being flooded. In a high temperature and humid environment, an automatic moisture-proof and dehumidification device should be set up in the control cabinet of the fire pump.
5) The fire pump control cabinet should be equipped with a mechanical emergency start pump function, and should ensure that the fire pump is started in an emergency by the personnel with management authority when the control circuit in the control cabinet fails. When the mechanical emergency starts, it should be ensured that the fire pump works normally within 5min after the alarm.
6) The obvious part of the front panel of the fire pump control cabinet should be equipped with a device to open the cabinet door in case of emergency.
7) The fire pump control cabinet should have output terminals that display the working status and fault status of the fire pump and a person terminal that remotely controls the fire pump start. The control cabinet should have functions such as automatic inspection adjustability, display inspection status and signal, and the dialogue interface should have Chinese language, and the icon should be easy to identify and operate.
3.Power unit for fire water pumps.
1) The power supply of the fire pump shall be designed in accordance with the provisions of the Code for the Design of Power Supply and Distribution System (GB50052-2009). The power supply of the fire transfer pump shall meet the power supply requirements of the fire pump. Fire pumps, fire regulators and fire transfer pumps should have uninterrupted power**, and internal combustion engines can also be used as power units.
2) The automatic switching time of the dual power supply of the fire pump should not be greater than 2s, and the switching time of one power supply and the power of the internal combustion engine should not be greater than 15 s.
7) Communication alarm equipment.
The fire pump room shall be equipped with communication equipment directly connected to the fire control center or fire rescue agency of the unit, so as to get in touch with the fire control center or fire rescue agency in time after a fire.
3. Fire water supply pipeline.
1) Outdoor fire water supply pipes.
1.Layout requirements for outdoor fire water supply pipes.
1) When the outdoor fire water supply adopts two fire water supply, it should be arranged in a ring shape, but when one fire water supply is used, it can be arranged in a branch shape.
2) There should be no less than two inlet pipes for water transmission to the annular pipe network, and when one of them fails, the rest of the inlet pipes should still be able to meet the total supply requirements of fire fighting water.
3) The fire water supply pipeline should be divided into several independent sections by valves, and the number of internal and outdoor fire hydrants in each section should not exceed 5.
4) The diameter of the pipeline should be calculated and determined according to the flow, flow rate and pressure requirements, but should not be less than DN100, and should not be small DN150 if conditions permit
5) Other requirements for the installation of outdoor fire water supply pipelines shall comply with the relevant provisions of the "Outdoor Water Supply Design Standards" (GB 50013-2018).
2.Pipes, valves and laying.
1) Tubing. Buried pipelines should be made of ductile iron pipes, steel mesh skeleton plastic composite pipes and steel pipes with strengthened anti-corrosion, indoor and outdoor overhead pipelines should be made of hot-dip galvanized steel pipes and other metal pipes, and should consider the working pressure of the system, the depth of soil covering, the nature of the soil, the corrosion resistance of the pipeline, may be affected by other additional loads such as soil, building foundation, motor vehicles and railways, as well as the comprehensive impact of the pipeline through expansion joints and settlement joints, reasonable selection of pipes and design of pipelines.
1) Buried pipelines. When the working pressure of the system is not greater than 1When 2MPa, it is advisable to use ductile iron pipe or steel mesh skeleton plastic composite pipe; When the system working pressure is greater than 12MPa and less than 1When 6MPa, it is advisable to use steel mesh skeleton plastic composite pipes, thickened steel pipes and seamless steel pipes; When the system working pressure is greater than 1When 6MPa, it is advisable to use seamless steel pipes.
2) Overhead pipelines. When the system working pressure is less than or equal to 1When it is 2MPa, hot-dip galvanized steel pipe can be used; When the system working pressure is greater than 12MPa and less than 1When 6 MPa, hot-dip galvanized thickened steel pipe or hot-dip galvanized seamless steel pipe should be used; When the system working pressure is greater than 1At 6 MPa, hot-dip galvanized seamless steel should be used.
2) Valves. 1) The valve selection of the fire water supply system should comply with the following provisions: The valve of the buried pipeline should be a dark rod gate valve with an opening and closing scale, and a corrosion-resistant open rod gate valve can be used when it is set in the valve well. The valves of indoor overhead pipelines should be butterfly valves, open rod gate valves or dark rod gate valves with opening and closing scales. Outdoor overhead pipelines should use dark rod gate valves with opening and closing scales or corrosion-resistant open rod gate valves.
An automatic exhaust valve should be set at the highest point of the pipeline of the fire water supply system. When the water supply height of the fire pump exceeds 24m, the water hammer eliminator should be used When the water outlet pipe of the fire pump is equipped with a capsule pneumatic water tank, there is no water hammer elimination facility. In cold and severe cold areas, outdoor valve wells should take anti-freezing measures. Permanent fixed signs should be set up at the location of indoor and outdoor fire hydrants and valves of the fire water supply system.
2) The setting of the pressure reducing valve shall comply with the following provisions: the pressure reducing valve shall be set in front of the inlet of the alarm valve group, and a standby pressure reducing valve shall be set when two or more alarm valve groups are connected. The inlet of the pressure reducing valve should be provided with a filter, the diameter of the orifice of the filter should not be less than 4 5 mesh c, and the overflow area should not be less than 4 times the cross-sectional area of the pipeline. Pressure gauges should be set before and after the filter and pressure reducing valve, and the diameter of the dial of the pressure gauge should not be less than 100 mm, and the maximum range should be twice the design pressure. Control valves should be set before the filter and behind the pressure reducing valve. A pressure test drain valve should be set up after the pressure reducing valve. The pressure reducing valve should be equipped with a flow detection test interface or a flow meter. For vertically installed pressure reducing valves, the water flow direction should be downward. The proportional pressure reducing valve should be installed vertically, the adjustable pressure reducing valve should be installed horizontally 9, and the pressure reducing valve and the control valve should have a device to protect or lock the adjustment fittings. There should be no air blockage and air resistance in the pipe section connected to the pressure reducing valve.
3) Laying. The requirements of the foundation, foundation, cushion and backfill compaction of buried pipelines should be implemented according to the properties of rigid pipes or flexible pipes, combined with the specific conditions of the buried pipes, in accordance with the relevant provisions of the Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering (GB 50268-2008) and the Code for the Design of Pipeline Structures for Water Supply and Drainage Engineering (CB 50332-2002). When the diameter of the buried pipe is not less than DN100, reinforced concrete piers should be set at the positions of pipe elbows, tees and plugs. The fire water supply pipeline should not cross the building foundation, and when it must be crossed, protective measures such as protective sleeves should be taken. Buried steel pipes and cast iron pipes should be determined according to soil and groundwater corrosivity and other factors. Corresponding anti-corrosion measures should be taken on the outer wall of the overhead pipeline in the seaside, humid air and other places where the air contains corrosive media.
2) Indoor fire water supply pipes.
The indoor fire water supply network is an important part of the indoor fire hydrant water supply system, which can be used to ensure the safety of water supply.
It shall comply with the following provisions when arranged:
1) The pipe network of the indoor fire hydrant system should be arranged in a ring shape, when the design flow rate of the outdoor fire hydrant is not more than 20L s and the indoor fire hydrant is not more than 10, except for Article 8 of the Technical Code for Fire Water Supply and Fire Hydrant System (GB50974-2014).1.Except in the cases specified in 2, it can be arranged in the form of branches.
2) When the water supply is directly supplied by the outdoor production, living and fire protection system, the combined system should not only meet the design flow requirements of outdoor fire water supply and the design flow rate of the maximum hour of production and life, but also meet the design flow and pressure requirements of the indoor fire water supply system.
3) The diameter of the indoor fire pipe should be calculated and determined according to the design flow, flow rate and pressure requirements of the system; The diameter of the indoor fire hydrant riser should be calculated according to the minimum flow rate of the standpipe, but should not be less than DN100.
4) The following provisions shall be met when the annular water supply pipeline of indoor fire hydrant is overhauled:
1) The indoor fire hydrant riser should ensure that no more than 1 standpipe is closed and deactivated when the pipeline is overhauled, and when there are more than 4 standpipes, 2 non-adjacent standpipes can be closed.
2) A valve should be set at the junction of each vertical pipe and the water supply horizontal trunk pipe.
5) The water supply pipe network of indoor fire hydrants should be set up separately from the pipe network of other water extinguishing systems such as automatic sprinkler; When the fire pump is shared, the water supply pipeline should be set separately in front of the alarm valve along the direction of water flow.
6) The design flow rate of the fire water supply pipeline should not be greater than 25M s, the design flow rate of the automatic sprinkler system pipeline shall comply with the relevant provisions of the "Design Code for Automatic Sprinkler System" (GB50084-2017), "Design Code for Foam Fire Extinguishing System" (GB 50151-2010), "Technical Code for Water Spray Fire Extinguishing System GB50219-2014" and "Design Code for Illustrated Fire Cannon Fire Extinguishing System" (GB50338-2003), but the feed water flow rate of any fire pipeline should not be greater than 7M S.
Fourth, the fire pump adapter.
The fire pump adapter is a reserved interface for fire trucks to deliver fire water to the fire water supply network. It can be used both to replenish the amount of water for fire fighting and to increase the water pressure in the fire water supply network. In the event of a fire, when the fire pump in the building fails or the indoor fire water is insufficient, the fire truck takes water from the outside and sends the water to the indoor fire water supply network through the pump adapter for fire extinguishing.
Set the requirements. 1) High-rise civil buildings, residential buildings with fire water supply, other multi-storey civil buildings with more than five floors, underground or semi-underground buildings (rooms) with more than two floors or construction area greater than 10,000, civil air defense projects with a design flow of more than 10 l s for indoor fire hydrants, high-rise industrial buildings and multi-storey industrial buildings with more than four floors, and urban traffic tunnels, the indoor fire hydrant water supply system shall be equipped with a water pump adapter; Water extinguishing systems such as automatic water fire extinguishing systems, water spray fire extinguishing systems, foam fire extinguishing systems and fixed fire cannon fire extinguishing systems should be equipped with fire pump adapters.
2) The feed water flow of the fire pump adapter should be calculated according to each 10 15L s. The number of fire pump adapters for each water extinguishing system should be calculated according to the design flow rate of the system, but when the number of calculations exceeds 3, it can be appropriately reduced according to the reliability of water supply.
3) When the temporary high-pressure fire water supply system supplies water to multiple buildings, the fire pump adapter should be installed near each building.
4) The water supply range of the fire pump adapter should be determined according to the water supply flow and pressure of the local fire truck, (5) when the fire water supply is a vertical partition water supply, the water pump adapter should be set up separately in the partition within the water supply pressure range of the fire truck; When the height of the building exceeds the water supply height of the fire truck, the suction and pressurization interface of the hand pump or mobile pump relay water supply should be set up at the equipment floor and other convenient places for operation.
6) The water pump adapter should be located in a place that is convenient for fire trucks to be used outdoors, and the distance from the outdoor fire hydrant or fire pool should not be less than 15 m and should not be greater than 40 m.
7) The installation height of the wall fire pump adapter should be 0 from the ground7m;The net distance from the doors, window holes and holes on the wall should not be less than 2m, and should not be installed under the glass curtain wall; The installation of the underground fire pump adapter should be so that the distance between the water inlet and the bottom surface of the manhole cover is not more than 04 m and should not be less than the radius of the manhole cover.
8) The water pump adapter should be marked with the name of the water supply system of each pump adapter, set up a permanent sign nameplate, and should indicate the water supply system, water supply range and rated pressure.
b) Composition. The water pump adapter is composed of a valve, a safety valve, a check valve, a bolt discharge valve and a connecting elbow, etc., when the water is fed from the bolt of the pump adapter outdoors, the safety valve plays the role of protecting the system to prevent the water supply pressure from exceeding the rated pressure of the system; The water pump adapter is equipped with a check valve to prevent the system feed water from flowing out from the pump adapter in order to consider the needs of safety valve and check valve maintenance, and a valve should also be set; The water valve of the deflating pressure tank has the function of draining water and is used for antifreeze. The order of the pump adapter assembly should be reasonable, according to the direction of the water supply of the pump adapter, the check fill valve, the safety valve and the valve.
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