How to choose a stainless steel submersible pump

First of all, we need to determine the type of water pump when choosing a water pump. The stainless steel submersible pump we use here

 needs to determine whether the water pump is used for wells or sewage discharge, whether it is a building pressurization or a fountain landscape. 

We first need to determine the use direction of the stainless steel submersible pump and determine the correct working conditions before we can 

choose the appropriate pump category.

Determine product parameters

When we know the pump category, we need to determine the parameters required for the product. For example, we need a fountain pump. The 

fountain pump generally has a large head. Our landscape project needs to drive 20m3/h of water to a height of 8m. At this time, we need to determine 

the parameters of the stainless steel submersible pump with a flow rate of 20m3/h. However, because the fountain is generally vertically upward to draw 

water, we need to hit the 8m position with a higher head than the expected water level. We may need to make 10m or more inside. To determine the 

parameters, the selection will be more accurate.

After we determine the product categories and parameters, we must also understand the use environment whether the water pump can meet the needs. 

For example, stainless steel submersible pumps are used for deep well water extraction. After determining the pump type and parameters, we also need 

to understand the situation of the well, such as the wellhead diameter, dynamic water level and static water level, water quality, etc. Only after these problems

 are determined can a suitable pump be installed.

Please understand the environmental data of the water pump usage before selecting the pump type.

1. List basic data:

1. Characteristics of the medium: media name, specific gravity, viscosity, corrosiveness, toxicity, etc.

2. The diameter and content (mass or volume percentage) of the solid particles contained in the medium

3. Media temperature: (℃)

4. Required traffic

Generally, industrial pumps can ignore the leakage in the pipeline system in the process flow, but the impact on the flow rate when the process changes must

 be considered. If agricultural pumps use open channel water transport, leakage and evaporation must be considered.

5. Pressure: Pressure drop (head loss) in the suction pool pressure drainage pool pressure pipeline system

6. Pipeline system data (pipe diameter, length, type of pipeline accessories and geometric elevation from the suction tank to the pressure tank, etc.) If necessary, 

the device characteristic curve should be made. When designing and laying the pipeline, the following matters should be paid attention to:

A. Reasonable selection of pipe diameter is large under the same flow rate, low flow velocity, small resistance loss, but high price, small pipe diameter will lead to 

a sharp increase in resistance loss, which will increase the head of the selected pump, and increase the belt power and operating costs. Therefore, it should be 

considered comprehensively from a technical and economic perspective.

B. The discharge pipe and its pipe joints should take into account the maximum pressure that can be withstanded.

C. The pipeline arrangement should be arranged as straight as possible to minimize the accessories in the pipeline and minimize the length of the pipeline. When 

the pipe must be turned, the bending radius of the elbow should be 3 to 5 times the diameter of the pipeline. The angle should be as large as 90℃ as possible.

D. The discharge side of the water pump must be equipped with valves (ball valves or shut-off valves, etc.) and check valves to adjust the operating point of the pump. 

The check valve can prevent the pump from reversing when the liquid flows backward and prevent the pump from hitting the water hammer (when the liquid flows

 backward, huge reverse pressure will be generated to damage the pump)

2. Determine the flow head

Determination of traffic

a. If the minimum, normal and maximum flow rate have been given in the production process, the maximum flow rate should be considered as the maximum flow rate.

b. If only normal flow is given in the production process, consider leaving a certain margin. For large flow rates of ns>100, the unexpected head pump flow margin is 

5% for small flow rates of ns>50, the flow margin of high-head pump flow margin is 10% for small flow rates of ns>50. The pump flow margin of 50≤ns≤100 is also 5%. 

For pump flow margin of poor quality and poor operating conditions, 10% should be taken.

c. If the basic data is only given to the weight flow, it should be converted into volume flow