Class 4 (4th Engineer) MEKG 📅 Jun 2024

Exam Question

Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service? (16)

(a) Copper.

(b) Copper and carbon.

(d) Bronze.

Briefly justify your answer.

Reference Answer

The correct answer is **(c) Carbon**.
**Comprehensive Justification:**
To achieve full marks (16/16), a detailed understanding of material science applied to mechanical seals is required. The 'dynamic seal material' refers to the primary sealing face that experiences sliding contact during pump operation. In most centrifugal pumps operating in water service, this critical component is made from specialized carbon materials, specifically carbon-graphite, often impregnated with resin or metal to enhance its properties.
**1. Role of Mechanical Seals in Centrifugal Pumps:**

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