The selection of fire pumps is of great importance. Experts in the pump industry will explain the 7 major criteria for the selection of fire pumps for your reference.
Selection criteria for fire pump 1.
High efficiency, low noise, and energy-saving centrifugal pumps should be selected. It is strictly forbidden to select products for the obsolete products.
Selection standard of fire pump 2.
The voltage of the motor equipped with the centrifugal pump should be the same, and the power supply system should be the same as the power supply system of the national grid.
Selection criteria for fire pump 3.
The multi-stage pump unit of the domestic pressurized water supply system should be equipped with a standby pump. The water supply capacity of the standby pump should be greater than the water supply capacity of the running pump. The pumps should be switched automatically and operated alternately.
Selection criteria for fire pump 4.
When the water supply network has no regulating facilities, it is advisable to use a rated speed pump set to run. The large water output of the pump set should not be less than the design flow of the water supply in the community, and it should be checked according to the fire fighting conditions.
Selection criteria for fire pump 5.
Lifting pumps for water tanks and water towers should minimize the number of pumps. One pump should be used and one spare; when a single pump can meet the requirements, multiple parallel connections should not be used; if multiple parallel operations must be used or In the matching mode of large and small pumps, the model and number of centrifugal pumps should not be too large, and the model should generally not exceed two. The head range of single-stage clean water centrifugal pumps should be similar; each pump should still run in the high-efficiency area during parallel operation.
Fire pump selection criteria 6.
The pump should be selected according to the design flow rate and the required head, and the pump output of the electric fire pump should be considered due to wear and other reasons. The slurry pump can be selected by multiplying the calculated head H by 1.05 to 1.10 ; The characteristic curve should be selected as the pump whose head gradually decreases with increasing flow rate. The pump works stably and is reliable when working in parallel; and the operating point of the pump should be kept in a high-efficiency interval, which is both energy-saving and not easy to damage the machine parts.
Selection criteria for fire pump 7.
The water supply flow rate of the variable frequency speed control pump should be guaranteed to meet the design second flow requirements in the domestic water supply system. The power supply of the slurry pump must be reliable; the working point of the pump should be selected in the high-efficiency working area of the pump characteristic curve, and cannot be selected in the extension line of the QH curve. The unfavorable working point of the design should be at the right end of the high-efficiency section of the pump characteristic curve, That is, the point where the pump has large output and the head is low but can meet the requirements, that is, the intersection of the low point of the high-efficiency area of the pump characteristic curve and the pipeline characteristic curve. The working range of the pump speed regulation can be within the high-efficiency section of the pump as much as possible; the speed regulation range should be set between 25% and 100% of the water supply of the pump; the equipment should have automatic water level control function.