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Suction depth: The difference in height between the pump reference surface and the suction fluid level.
2, classification
1), distinguish by inhalation: single suction, double suction
2), differentiated by stages: single-stage, multi-stage
3) According to the number of export points: single exit, double exit comprehensive fire pump is often divided into: constant pressure tangent fire pump, multi-level single exit, double exit fire pump, constant pressure single-stage fire pump, regulator buffer multi-level fire Pumps and single stage double suction fire pumps.
3, the characteristics of the use of special hydraulic design and structural design, so that it has a flow pressure sub-choice than the ordinary centrifugal clean water pump is more suitable for the construction of fire water supply system selection, flow - pressure curve flat no hump. High reliability due to the wear-resistant, corrosion-resistant, and anti-mesh material for all parts where friction occurs due to rotation. The multi-stage pump can be equipped with dual water outlets. The pump body has high load carrying capacity, strong anti-overload capability, and agility. .
4, structural requirements
1) The structure of the pump should ensure easy on-site maintenance and replacement of parts. Fasteners and self-locking devices should not be loosened due to vibration or other reasons.
2) An arrow indicating the direction of rotation should be cast on the pump body.
3), there should be pressure gauges, vacuum gauges (except submersible pumps, deep well pumps), the accuracy of the table should not be less than 2.5.
4) The pump should be provided with a water tap.
5), the nominal pressure of the pump outlet flange should be able to meet the requirements of the maximum working pressure, the nominal pressure of the pump inlet flange should not be less than 1.0MPa. The flange connection dimensions shall comply with the provisions of GB/T 9112-2000 and GB/T 9124-2000.
6) The pump inlet should be able to withstand a positive pressure of 0.4 MPa.
4, material requirements
1) The pump casing should use cast iron, cast steel, cast aluminum or cast copper and other casting alloys. Shafts shall be made of stainless steel or equivalent corrosion resistant material of at least 2Cr13, or carbon steel material for the shaft, but bushings of corrosion resistant material shall be used at the flow path of the packing box and the pump body.
2) Impeller, impeller seal ring, shell seal material, collar, packing ring, water seal ring, seal cap, packing sleeve, etc. shall be made of corrosion-resistant materials.
5, performance
1) Sealing test shall be carried out in accordance with Article 10.5 of the “Fire Pump†GB6245-2006. The pump body and its components shall not have any defects such as leakage or sweating.
2) The hydrostatic strength test shall be conducted in accordance with Article 10.6 of the “Fire Pump†GB6245-2006. The pump casing shall have no defects such as deformation and cracks that will affect the performance during the test.
6. Continuous operation performance is carried out according to 10.10 of "Fire Pump" GB6245-2006, satisfying:
1) The outlet pressure of the pump should not be lower than the rated outlet pressure, and the flow rate should meet the requirements of rated flow.
2) The temperature of the outer surface of the bearing seat should not exceed 75°C and the temperature rise should not exceed 35°C.
3) The shaft seal is well sealed and the wireless leak phenomenon.
4) The vibration of the pump shall comply with the provisions of JB/T 8097.
7, fire pump design points
1) Fire pump performance parameter requirements (1) Ordinary fire pump operating conditions 1: When the suction depth is 1m, the rated flow (Qn) and rated pressure (Pn) requirements shall be met, and the working pressure shall not exceed 1.05 times the rated pressure. .
Condition 2: When the suction depth is 1m, the flow rate is 1.5 Qn, and the working pressure should not be less than 0.65 Pn.
The maximum working pressure must not exceed 1.4 Pn.
(2) Working condition of deep well and submersible fire pump: When the suction depth is 0m, the rated flow (Qn) and rated pressure (Pn) requirements shall be met, and the working pressure shall not exceed 1.05 times the rated pressure.
Condition 2: When the suction depth is 0m, the flow rate is 1.5 Qn, and the working pressure should not be less than 0.65 Pn.
The maximum working pressure must not exceed 1.4 Pn.
2) Testing of structural requirements, corrosion resistance, mechanical properties, continuous operation, etc. shall comply with the requirements of the standard GB6245-2006.
3) Pumps used in the pump group should be subjected to type identification and type inspection and comply with relevant standards. The selected prime movers should be identified and conformed to the relevant standards. The engine should have a good start-up performance at room temperature and should be guaranteed to start smoothly within 5s. Within 20s after the introduction of water, the fire pump should be able to reach the rated condition.
4) The water pump impeller rotates flexibly without any jamming.
5) The designer shall select and determine the type of the fire pump according to the location, area and fire-fighting water supply system of the fire pump room in the project.
6) The flow rate and pressure of the fire pump shall be calculated and determined according to the requirements for the fire water volume and water pressure of the service buildings (or factory areas, residential quarters), yards and storage tanks. Fire-fighting pumps should meet the fire water pressure and flow requirements. The flow rate and head of the pump are not lower than the design requirements and not lower than the given value of the performance curve.
7) The fire-fighting water pump of the temporary high-pressure fire-fighting water supply system shall be prepared for use or be used for multiple purposes. The standby fire pump's working ability should not be less than the largest one of the fire fighting working pumps. When more than one equipment is used, the impact of multiple fire pumps in parallel on system flow and pressure should be considered.
8) When selecting a fire pump, its flow-pressure (Q-P) characteristic curve should be flat without a hump. When conditions permit, the pump unit can be integrated with a tangential pump or pump valve (reduced pressure regulator valve).
8, construction, installation points
1) The distance between the outer contour surface of the fire pump unit and the wall and adjacent units shall be in accordance with that there is no gas in the suction pipe, and the selected reducer is an eccentric reducer.
2) The center of the coupling of the pump and the motor is aligned.
3) The base of the pump is flat.
4) The device fasteners are firm.
What fire pump is used in a small fire truck?
1. Main control parameters The main control parameters selected by the fire pump are the pump's rated flow, rated pressure and suction depth.