First, the fountain pump selection principles
Fountain pump is a kind of surface wide variety of general-purpose machinery and equipment, fountain pumps are widely used in petroleum, chemical, electric power metallurgy, mining, shipbuilding, light industry, agriculture, civil and defense sectors, occupies an important national economy status. Vigorously reduce the fountain pump energy consumption, energy conservation with a very significant significance.
In recent years, the pump industry has designed and developed many energy efficient products, such as IHF, CQB, FSB, UHB and other models of pump products, to reduce the energy consumption of the pump played a positive role. But in all fields of the national economy, due to the irrational selection, many of the pumps in an unreasonable operating conditions, operating efficiency is low, a lot of energy wasted. Some pumps because of unreasonable selection, can not be used, or the use of maintenance costs, low economic efficiency. Thus, the rational choice of the same energy-saving pump is also important.
The so-called rational election pump, is to consider the pump unit and pump station investment and operating costs and other comprehensive technical and economic indicators, so that in line with economic, security, the principle of application. Specifically, the following aspects:
1, to meet the requirements of the use of flow and head, which requires the pump operation point (device performance curve and pump performance curve of the intersection) often remain in the high-performance range of operation, so that both power and damage to mechanical parts.
2, the choice of fountain pump is not only small size, light weight, low cost, but also has good characteristics and high efficiency.
3, the fountain pump has good anti-cavitation performance, so that both reduce the depth of excavation pump, fountain pump does not make cavitation, smooth operation, long life.
4, the selected fountain pump construction pump station, less investment, low operating costs.
Second, fountain pump selection steps
(1) Data:
1, the media properties: media name, specific gravity, viscosity, corrosion, toxicity and so on.
2, the medium contained in the particle diameter, content.
3, the required flow: general industrial pumps in the process can ignore the leakage in the pipeline system, but must consider the process of change in the impact of traffic. Agricultural pumps If the use of open channel water, but also must consider the leakage and evaporation.
4, pressure: suction tank pressure, drainage tank pressure, pipe system pressure drop (head loss).
5, the pipeline system data: diameter, length, pipe type and number of accessories, sink to the pressure tank geometric elevation.
In the design layout pipeline, should note the following:
A, reasonable choice of pipe diameter, pipe diameter, at the same flow rate, the flow velocity is small, the resistance loss is small, but the price is high, the pipe diameter is small, will lead to a sharp increase in resistance loss, the selected pump head increase, With the increase in power, costs and operating costs have increased. So should be considered from the technical and economic point of view.
B, the exhaust pipe and its joints should consider the maximum pressure can withstand.
C, pipe layout should be arranged as straight as possible to minimize the pipe fittings and to minimize the length of the pipe must be turned when the bending radius of the elbow pipe diameter should be 3 to 5 times the angle as much as 90 Lt; 0 & gt; C.
D, the pump must be installed on the discharge side of the valve (ball valve or globe valve, etc.) and check valve. The valve is used to adjust the operating point of the pump. The check valve prevents the pump from reversing when the liquid is backflow and prevents the pump from hitting the water hammer. (When the liquid backflow, it will have a huge reverse pressure, damage to the pump)
(2) determine the flow
A, if the production process has been given the minimum, normal, maximum flow, the maximum flow should be considered.
B, if the production process only gives the normal flow, should consider leaving a certain margin.
For ns> 100 high flow low unexpected pump, the flow margin to take 5%, for ns <50 of the small flow and pump, the flow margin to take 10%, 50 ≤ ns ≤ 100 pump, the flow margin Take 5%, poor quality and poor operating conditions of the pump, the flow margin should be taken 10%.
C, if the basic data only to the weight flow, should be converted into volumetric flow.
Fountain pump is a kind of surface wide variety of general-purpose machinery and equipment, fountain pumps are widely used in petroleum, chemical, electric power metallurgy, mining, shipbuilding, light industry, agriculture, civil and defense sectors, occupies an important national economy status. Vigorously reduce the fountain pump energy consumption, energy conservation with a very significant significance.
In recent years, the pump industry has designed and developed many energy efficient products, such as IHF, CQB, FSB, UHB and other models of pump products, to reduce the energy consumption of the pump played a positive role. But in all fields of the national economy, due to the irrational selection, many of the pumps in an unreasonable operating conditions, operating efficiency is low, a lot of energy wasted. Some pumps because of unreasonable selection, can not be used, or the use of maintenance costs, low economic efficiency. Thus, the rational choice of the same energy-saving pump is also important.
The so-called rational election pump, is to consider the pump unit and pump station investment and operating costs and other comprehensive technical and economic indicators, so that in line with economic, security, the principle of application. Specifically, the following aspects:
1, to meet the requirements of the use of flow and head, which requires the pump operation point (device performance curve and pump performance curve of the intersection) often remain in the high-performance range of operation, so that both power and damage to mechanical parts.
2, the choice of fountain pump is not only small size, light weight, low cost, but also has good characteristics and high efficiency.
3, the fountain pump has good anti-cavitation performance, so that both reduce the depth of excavation pump, fountain pump does not make cavitation, smooth operation, long life.
4, the selected fountain pump construction pump station, less investment, low operating costs.
Second, fountain pump selection steps
(1) Data:
1, the media properties: media name, specific gravity, viscosity, corrosion, toxicity and so on.
2, the medium contained in the particle diameter, content.
3, the required flow: general industrial pumps in the process can ignore the leakage in the pipeline system, but must consider the process of change in the impact of traffic. Agricultural pumps If the use of open channel water, but also must consider the leakage and evaporation.
4, pressure: suction tank pressure, drainage tank pressure, pipe system pressure drop (head loss).
5, the pipeline system data: diameter, length, pipe type and number of accessories, sink to the pressure tank geometric elevation.
In the design layout pipeline, should note the following:
A, reasonable choice of pipe diameter, pipe diameter, at the same flow rate, the flow velocity is small, the resistance loss is small, but the price is high, the pipe diameter is small, will lead to a sharp increase in resistance loss, the selected pump head increase, With the increase in power, costs and operating costs have increased. So should be considered from the technical and economic point of view.
B, the exhaust pipe and its joints should consider the maximum pressure can withstand.
C, pipe layout should be arranged as straight as possible to minimize the pipe fittings and to minimize the length of the pipe must be turned when the bending radius of the elbow pipe diameter should be 3 to 5 times the angle as much as 90 Lt; 0 & gt; C.
D, the pump must be installed on the discharge side of the valve (ball valve or globe valve, etc.) and check valve. The valve is used to adjust the operating point of the pump. The check valve prevents the pump from reversing when the liquid is backflow and prevents the pump from hitting the water hammer. (When the liquid backflow, it will have a huge reverse pressure, damage to the pump)
(2) determine the flow
A, if the production process has been given the minimum, normal, maximum flow, the maximum flow should be considered.
B, if the production process only gives the normal flow, should consider leaving a certain margin.
For ns> 100 high flow low unexpected pump, the flow margin to take 5%, for ns <50 of the small flow and pump, the flow margin to take 10%, 50 ≤ ns ≤ 100 pump, the flow margin Take 5%, poor quality and poor operating conditions of the pump, the flow margin should be taken 10%.
C, if the basic data only to the weight flow, should be converted into volumetric flow.
Manufacturers recommend: Shenlong fountain submersible pump
Keywords: Fountain pumps, selection principles, selection steps
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