Class 2 (2nd Engineer) MEKG 📅 Feb 2023

Exam Question

(a) Sketch a simple cross section through a single stage centrifugal pump with a fully shrouded single entry impeller, name the components of the pump and indicate the direction of fluid flow

(b) Describe

(i) The function of the impeller and how suction is created by it

(ii) The funciton of the volute casing

(iii) State the material of each component of the pump

(d) State why some centrifugal pumps have

(i) A double volute casing

(ii) A diffuser ring

Reference Answer

### (a) Cross Section of a Single Stage Centrifugal Pump
A sketch would show a cross-section of the pump casing with the impeller mounted on a shaft at its center. The fluid enters axially through the suction inlet and is discharged radially from the discharge outlet.
**Components to be Labelled:**
1. **Suction Inlet (Eye):** The central opening where the fluid enters the impeller.

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