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1. Confirm the environmental conditions
Including ambient temperature, relative humidity, atmospheric pressure, air corrosivity, hazardous area grade, dustproof and waterproof requirements.
2. Confirm operating conditions
Refers to the liquid surface pressure on the suction side (absolute), the liquid surface pressure on the discharge side, intermittent or continuous operation, fixed or mobile position, and ease of installation and maintenance.
3. Confirm the properties of the medium, including medium name, temperature, density, viscosity, saturated vapor pressure, solid particle diameter and content, gas content, corrosiveness, volatility, flammability, and toxicity.
4. Select the material of the pump wetted parts
According to the physical and chemical properties of the pumped medium, the following aspects are mainly considered:
(1) Corrosiveness of the medium
The corrosion resistance of the pump's flow-through components can meet the requirements of use, and excessive corrosion resistance cannot be pursued, otherwise, the purchase cost of the pump will be greatly increased.
(2) Whether the medium contains solid particles
Because the hardness and content of solid particles are directly related to the durability of the pump wetted parts.
(3) The temperature (pressure) of the medium
The higher the temperature (pressure) of the medium, the higher the material strength of the pump wetted parts. Generally, when the temperature is >250℃, steel castings or steel parts should be used.
(4) Medium with sanitary or no pollution requirements
Select the material of the corresponding wetted parts. In addition, the structure of the pump should be easy to clean.
