What is the difference between chemical process pumps and clean water pumps?
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As the title suggests, what are the specific differences between these two in terms of structure and design?
Clean water pumps have an impeller-based design. Chemical pumps are generally of the gear type, with only a few being of the impeller type. The fluid handled by clean water pumps is relatively simple – just water – and the material requirements for such pumps are not high; ordinary cast iron is sufficient； Chemical pumps, on the other hand, require different materials depending on the type of medium they handle
There are significant differences in the materials and the sealing types of the pumps.
They are basically all centrifugal pumps; their structure is similar, but the materials vary
The most important factor is still the range of use. Chemical process pumps can be used as clean water pumps (for those who can afford them), but clean water pumps cannot be used as chemical process pumps. Chemical process pumps come in a wide range of materials, divided into metal and non-metal pumps. For clean water pumps, cast iron is generally sufficient. Structurally, chemical process pumps are of the centrifugal type. There are centrifugal water pumps, as well as those like deep well pumps and submersible pumps that are placed directly into water. This is what I know; I’ll wait for other experts to add more.
There is not much difference in terms of structural design. For chemical process pumps, safety is of primary importance; therefore, strict requirements apply to these pumps in terms of design, manufacturing, inspection, and acceptance. The main performance standards are API610 (Class 1 standard) and GB/T5656 (Class 2 standard); these standards set strict requirements regarding the pressure rating of the pump casing, materials used, mechanical seals, and pump vibration. Pumps mainly comply with GB/T 5657 (Class 3 standard); those interested can compare them.