4), water tanks, cooling towers to enhance the pump should minimize the number of pump stations, should be one with a preparation; meet the requirements of a single pump, you should not be used more than one parallel; If it must be multiple parallel operation or size of the pump with the way the model number should not be too many models are generally not more than two types of pump head range should be similar; parallel operation of each pump should run still efficient area.
6), the life of pressurized water system pump unit should be set to the standby pump, water supply capacity of the standby pump should be more than a running water supply capacity of the pumps, water pump should automatically switch to alternately run.
7) World Pipe network informed, water pumps with the motor voltage should be the same, and the power supply standard with national grid power supply system.
multi-stage pump: the pump shaft there are two or more of the impeller, when the lift generated by the pump head for all the impeller.
Selection the points
rational pump selection needs to consider the technical and economic indicators of the pump unit, pumping station investment and operating costs, so that in line with economic, security, the principles applicable. Including the following aspects:
sspump.org/oxv327.html
vertical fire pump
Introduction
1), should choose a high efficiency, low noise world pie network information , energy-saving pumps is strictly prohibited eliminated products.
sspump.org/oxv276 html
3), when the water supply network conditioning facilities, should adopt the governor pump or pumps rated speed grouping running water supply. The largest pump out of water should not be less than the residential water supply design flows, and should check fire conditions.
vertical pipeline pump
sspump.org/xv37.html
2), should be based on the design flow, the required lift pump selection, and consider the pump due to wear and other reasons caused by the pump output decreased, according to calculation proceeds Head H multiplied by 1.05 to 1.10 coefficient selecting a pump ; characteristic curve with its head a gradual decline in pump flow rate increases, the pump is stable, reliable parallel operation; and pump operation point should be kept in the efficient range of operation, so that both energy saving and less damaged parts.
5), the frequency control design of the pump (s) water flow should guarantee to meet the requirements of the domestic water supply system design flow. Power supplies must be reliable (dual power supply or dual-circuit power supply); the operating point of the pump should be selected in the efficient work area of the pump characteristic curve (QH curve), and shall be selected in the extension line of the QH curve, the design of the most unfavorable operating point in the right side of the efficient section of the pump characteristic curve point, pump out the water, while the head low to meet the requirements, is the low point of the pump characteristic curve and efficient district and the pipeline characteristic curve crossing point. Pump speed control scope of work to try to pump highly efficient segment; speed range should be established between the pump water supply from 25% to 100%; equipment should have a water level control function.
mainly classified
of impeller number of classification according to the working
sspump.org/oxv221.html
sspump.org / oxv378.html
vertical pump motor cover and the pump cover joint body design, import and export the same into orthogonal and in the same line, and shaft centerline and the same import and export can be the same as the valve installed directly on the pipe, the installation is very simple. The compact appearance of vertical pumps, and small footprint, building low-input, such as outdoor motor can be placed in outdoor use.
vertical multistage pumps
vertical centrifugal pumps
vertical centrifugal pumps
References: Vertical Pump
single-stage pump: the pump shaft is only one impeller.