2 Bolt Hole Self-aligning Mounting Flanges 2 Bolt Hole Self-aligning Mounting Flanges NingBo Greenly Machinery Co.,LTD , https://www.greenlyagparts.com
Fire pump regulations, according to different classification methods are divided into different types, with its full seal, no leakage, corrosion resistance characteristics, the pump types are similar, but the head and flow are different. The selection basis of the fire pump should be based on the selection and application should be consistent with the provisions, the main material should meet the requirements, axial flow deep well pump and should meet the requirements, do not set a spare pump construction, pump room flow and pressure testing device should meet the requirements, Water absorption should comply with regulations, centrifugal fire pump suction pipe, outlet pipe and valves, etc. shall comply with the regulations, when there are two fire water supply and allow the fire pump to directly absorb water, it shall meet the requirements, the pressure gauge shall meet the requirements, and other aspects shall be considered. . The performance and technical conditions of the fire pump produced by Shanghai Liangong Pump Industry comply with the requirements of the "Fire Pump Performance and Test Method" standard. Keywords: fire pump regulations, fire pumps First, the selection and application should meet the requirements 1. Fire pump performance should meet the fire water supply system required flow and pressure requirements; 2. The fire pump with driver power should meet the selected pump The required power for operation at any point on the flow head performance curve; 3. When the motor-driven fire pump is used, the dry-installed fire pump should be selected; 4. The flow head performance curve should be smooth with no hump and no inflection point. The pressure at curve and zero flow should not exceed 140% of the design working pressure, and should be greater than 120% of the design working pressure; 5. When the outflow is 150% of design flow, the outlet pressure should not be lower than the design working pressure 65%; 6. The sealing method and material of the pump shaft should meet the requirements of the fire pump running at low flow; 7. The fire pump model of the same pump set of fire water supply should be consistent, and the working pump should not exceed 3 sets; 8. When the fire pumps are connected in parallel, the influence of stacking flow on the outlet pressure of the fire pump should be checked. Second, the main material should meet the requirements 1. The pump housing should be ductile iron; 2. The impeller should be bronze or stainless steel. When diesel engine fire pump is used, it shall meet the requirements. 1. The diesel engine fire pump should adopt the compression type diesel engine. 2. The diesel engine's rating power should check the altitude and the ambient temperature influence on the diesel engine's power. 3. The diesel engine fire pump should have continuous operation. Performance, test run time should not be less than 24h; 4 diesel engine fire pump battery should ensure that the fire pump at any time automatically start the pump requirements; 5. diesel engine fire pump fuel tank should be determined according to the fire duration, and the fuel tank small effective volume should be According to the 1.5L/KW configuration, the fuel stored in the diesel engine's fire pump tank should not be less than 50% of the reserve. Axial deep well pumps should be installed on wells, fire pools, and other firewater sources. 3. Axial-flow deep-well pumps should meet the requirements 1. When axial-flow deep-well pumps are installed in wells, the depth of submergence should meet the requirements for reliable operation. When the pump discharge flow is 150% of design flow, the low submergence depth should be a When the water level above the bottom of the pump impeller is not less than 3.20m, and the altitude is increased by 300m, the depth of the deep well pump should be increased by at least 0.30m. 2. When the axial-flow deep well pump is installed on a fire water source such as a fire pool, the pump The bottom of the impeller should be lower than the low effective water level of the fire pool, and the inundation depth should be calculated and determined according to the hydraulic conditions, and the requirements for the effective storage of the fire water source such as fire pools or effective water level energy should be met; when the pump design flow is greater than When 125L/S, the depth of submergence should be determined according to the performance of the pump, and the requirement for the cavitation erosion of the pump should be met; 3. When the low water level of the fire-fighting pool is lower than the center line of the outlet pipe of the centrifugal pump or the water source level, the centrifugal pump cannot ensure water absorption. Axial deep-well pump is used, and it should be installed in a fire pit and other fire-fighting water sources by means of wet-type deep pit installation; 4. When the axial flow deep well pump When the machine open-air setting, the function should be rain; 5. Other relevant provisions of GB50013 "outdoor water supply design" should be consistent with current standards. The fire pump should be equipped with a spare pump, whose performance should be consistent with the working pump. IV. Construction without backup pumps 1. Buildings with a building height less than 54m and outdoor firefighting water supply design flow equal to or less than 25L/S (WeChat public number: pump housekeeper); 2. Indoor firefighting water supply design flow equal to or less than 10L/S building. A group of fire pumps shall be provided with flow and pressure testing devices in the fire pump room. The pump flow rate and pressure test device should meet the requirements 1. When the flow rate of a single fire pump is not more than 20L/S, and the design working pressure is not more than 0.50MPa, the pump group should reserve the measurement flowmeter and pressure gauge interface, and other pumps. Group should set the pump group flow and pressure test device; 2. Shanghai Liangong pump fire pump flow detection device measurement accuracy should be 0.4, a large number of head 75% should be greater than the big one fire pump design flow value of 175%; 3. The measurement accuracy of the fire pump pressure detection device shall be 0.5, 75% of a large number of heads shall be greater than 165% of the design pressure of a large fire pump; 4. A test pipe of DN65 shall be installed on each fire pump outlet pipe. And should take drainage measures. V. Water absorption should meet the requirements 1. The fire pump should be self-irrigation; 2. When the fire pump is directly pumped from the municipal pipe network, a backflow preventer with air partition should be installed on the fire pump outlet pipe; When there is no suction well, a swirling flow preventer should be installed at the suction outlet. 6. Centrifugal fire pump suction pipes, outlet pipes and valves shall comply with the requirements 1. A group of fire pumps, suction pipes should not be less than two, when one of the damage or repair, the remaining suction pipe should still be able to pass all the fire Design flow of water supply; 2. Fire pump suction pipe arrangement should avoid the formation of air bags; 3. A group of fire pumps should be set to not less than two of the water mains connected to the fire water supply ring pipe network, when one of the water pipes overhaul The remaining water pipes shall still be able to pass all firefighting water supply design flow; 4. The submergence depth of the fire pump suction port of Shanghai Liangong Pump Industry shall meet the requirements of fire pump operation at low water level, and the suction pipe bell mouth is at a low effective water level in the fire water tank. The depth of submergence should be determined according to the water flow speed and hydraulic conditions of the horn of the suction pipe, but it should not be less than 600mm. When a swirl flow preventer is used, the depth of submergence should not be less than 200mm; 5. The rod of the fire pump should be set on the suction pipe Gate valve or butterfly valve with self-locking device, but it should be provided with open scale and mark when setting the dark rod valve; when the pipe diameter exceeds DN300, electric valve should be set; 6. Fire pump out Pipes should be provided with check valves and open lever valves; when using butterfly valves, they should be equipped with self-locking devices; when the pipe diameter exceeds DN300, electric valves should be set; 7. When the diameter of the fire pump suction pipe is less than DN250, the flow rate Should be 1.0m / s ~ 1.2m / s; diameter greater than DN250, should be 1.2m / s ~ 1.6m / s; 8. fire pump outlet pipe diameter is less than DN250, the flow rate should be 1.5m / s ~ 2.0m/s; when the diameter is greater than DN250, it should be 2.0m/s~2.5m/s; 9. The arrangement of the suction wells should meet the requirement that the flow of water in the well is smooth, the flow velocity is uniform, no vortex is generated, and the installation should be easy to install. 10. When the fire pump suction pipe and outlet pipe cross the outer wall, a waterproof casing shall be used; when passing through the wall and floor, the requirements of paragraph 5 of Article 12.3.19 of this code shall be met; 11. Absorption of fire pump When the pipe crosses the fire water tank, the flexible casing shall be used; when the rigid waterproof casing is used, the flexible joint shall be provided on the water suction pipe of the pump, and the pipe diameter shall not be greater than DN150. 7. When there are two ways of fire water supply and the fire pump is allowed to directly absorb water, it shall meet the requirements. 1. Each fire water supply shall meet the design flow rate of fire water supply and other water that must be ensured in case of fire; 2. The pressure of the outdoor water supply pipe network during fire The ground should not be less than 0.10MPa; 3. The fire pump head should be calculated according to the low water pressure of the outdoor water supply pipe network, and the high water pressure of the outdoor water supply should be used to check the working conditions of the fire pump. 8. The pressure gauge shall meet the requirements 1. The large range of fire pump outlet pressure gauge shall not be less than 2 times its design working pressure, and shall not be less than 1.60 MPa; 2. Shanghai Liangong Pump Fire Pump suction pipe should be Set the vacuum gauge, pressure gauge or vacuum pressure gauge. The large range of pressure gauge should be determined according to the specific conditions of the project, but it should not be less than 0.70MPa. The vacuum gauge's large range should be -0.10MPa. 3. The diameter of the gauge should not be Less than 100mm, pipes with a diameter of not less than 6mm shall be connected to the fire pump inlet and outlet pipes, and shut-off valves shall be provided.