A double volute casing to provide a rotational balance and this reduces wear on radial bearings.A diffuser ring is fitted to high-pressure centrifugal pumps to covert the kinetic energy into pressure, this ring is fixed in the casing around the impeller in such a way that passages are formed around the vanes.
Since very small needle lift is obtained in the test equipment result in an unequal pressure distribution in the cut off shaft resulting in a hard contact in a small area along with high frequency oscillations, low lubricity of test oil will increase the chance of seizure. Full lift and high lubricity of heavy oil eliminates this risk of seizure during normal operation.( Always open and clean slide type valves before testing as cold sticky heavy oil along with small clearances can cause restriction in the movement of the spindle).
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