What Is the Difference Between a Slurry Pump Liner and a Slurry Pump Casing?
In some slurry pump designs, the liner and the outer pump casing may be two distinct components. The liner typically comes into direct contact with the slurry, forming the flow passage and withstanding particle erosion, while the outer pump casing often serves functions such as support, connection, fixation, or pressure containment.
However, the terminology used varies across different manufacturers and models. Some technical literature refers to the liner as the pump casing, internal casing, or volute. Therefore, parts should not be determined solely based on Chinese naming conventions during procurement.
After prolonged operation, the liner may exhibit flow channel erosion, localized thinning, grooving, cracks, or perforations. Severe wear on the liner can lead to altered internal flow passages, reduced pump efficiency, leakage, or damage to the external structure.
When replacing a liner, it is essential to verify its inlet and outlet dimensions, bolt hole configurations, positioning locations, direction of rotation, internal flow path geometry, and mating tolerances with the impeller, throatbush (front liner), and frame plate liner insert (back liner). A similar appearance does not guarantee direct interchangeability.
