24 hours Hotline: 0086-371-63335262
Free Call
NEWS

Long shaft deep well fire pump structure requirements

2021-02-22
 1) The structure of the pump should be such that it is easy to maintain and replace parts on site. Fasteners and self-locking devices should not be loose due to vibration or the like.

2) An arrow indicating the direction of rotation should be cast on the pump body.

3), should have pressure gauge, vacuum pressure gauge (except submersible pump, deep well pump), the accuracy of the table should not be less than 2.5.

4) The pump should be equipped with a drain cock.

5) The nominal pressure of the pump outlet flange should meet the requirements of the maximum working pressure. The nominal pressure of the pump inlet flange should be not less than 1.0 MPa. The connection size of the flange should meet the requirements of GB/T 9112-2000 and GB/T 9124-2000.

6) The inlet of the pump should be able to withstand a positive pressure of 0.4 MPa.

Points to note when purchasing a long shaft deep well fire pump

1), fire pump performance parameter requirements

(1) ordinary fire pump

Working condition 1: When the suction depth is 1m, the rated flow rate (Qn) and rated pressure (Pn) requirements should be met, and the working pressure should not exceed 1.05 times of the rated pressure.

Working condition 2: When the suction depth is 1 m, 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) deep well, diving fire pump

Working condition 1: When the suction depth is 0m, the rated flow rate (Qn) and rated pressure (Pn) requirements should be met, and the working pressure should not exceed 1.05 times of the rated pressure.

Working condition 2: When the suction depth is 0 m, 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), structural requirements, corrosion resistance, mechanical properties, continuous operation and other performance testing should meet the requirements of GB6245-2006 standard.

3) The pumps used in the pump set shall be subjected to stereotype identification and type inspection and comply with relevant standards. The prime movers selected should be finalized and meet the relevant standards. The engine should have good normal temperature starting performance and should be guaranteed to start smoothly within 5s. Within 20s after the water is introduced, the fire pump should be able to reach the rated working condition.

4) The pump impeller rotates flexibly without jamming.

5) The designer should select and determine the type of fire pump according to the location and area of ​​the fire pump room in the project and the specific conditions of the fire water supply system.

6) The flow rate and pressure of the fire pump shall be determined according to the requirements of the fire water quantity and water pressure according to the serviced building (or factory factory area, residential area), storage yard, storage tank, etc. The fire pump shall meet the water pressure and flow requirements of the fire water. The flow rate and head of the pump are not lower than the design requirements and are not lower than the setpoint of the performance curve.

7) The fire pump of the temporary high-pressure fire water supply system shall be used one by one or one more. The working capacity of the standby fire pump should not be less than the largest one of the fire working pumps. When using more than one preparation, the influence of system flow and pressure on multiple fire pumps should be considered when working in parallel.

8) When selecting a fire pump, the flow-pressure (Q~P) characteristic curve should be flat and free of hump. When there are conditions, you can use a combination of a tangential pump or a pump valve (pressure reducing regulator).