The performance of full-flow, non-overloaded fire pumps should meet the following four requirements:

1. Working condition 1: When the suction depth is 1m, the outlet pressure of the fire water pump at zero flow should not be greater than 140% of the design working pressure:
2. Working condition 2: When the suction depth is 1m, the performance should meet the requirements of the design working flow (Qn) and design working head (Pn) of the fire water pump.
3. Working condition 3: When the suction depth is 1m, when the fire water pump outlet flow is 150% of the design flow, its outlet pressure should not be lower than 65% of the design working pressure:
4. Working condition 4: When the inlet pressure is always positive, as the flow rate increases, the shaft power curve should become flat or gradually decrease (the maximum shaft power value appears), and the matching motor power should be greater than or equal to the maximum shaft power value.

Note:

1. When testing the maximum shaft power, the water suction port of the fire water pump should absorb water under positive pressure;
2. Qn: Design working flow of fire water pump, Pn: Design head of fire water pump;
3. Pmax: the outlet pressure of the fire water pump at zero flow;
4. P1.5Q: The outlet pressure of the fire water pump at 1.5 times the rated flow point;
5. Nmax: Maximum shaft power value (tested at positive inlet pressure).

The shaft power of traditional fire pumps increases with the increase of flow rate, which can easily cause overload or burnout of the supporting motor when working at large flow rates. However, for fire pumps with full flow rate and no overload, the shaft power curve of the pump has a peak value or the shaft power decreases with the increase of flow rate. For minor changes, just choose the appropriate matching function

Rate:

1. It will not be overloaded or the motor will burn out when working at any flow point within the full flow range.
2. When the pressure of the fire pipe network is low, the pump can be started normally.
3. It can operate for a long time beyond the 1.5 times rated flow point.

In order to ensure that the motor equipped with the fire pump can operate safely within the full flow range, it is very necessary to choose a non-overload fire pump.

In order to realize a full flow non-overload fire pump, on the one hand, we invest heavily in research and development funds, learn from the research and development experience of nuclear power pumps, and make the maximum value on the fire pump shaft power curve as small as possible. We also apply simulation flow field analysis software to continue research and development and exploration. On the one hand, attention should be paid to improving the quality of parts, such as improving the smoothness of product flow channels and the stability of key dimensions. High-precision and high-efficiency equipment ensures the processing accuracy and reliability of parts, and ensures that the performance of products meets the full flow rate requirements from many aspects. overload requirements.