Which of the following is the most widely used heat insulating material for pipelines carrying steam ?
Correct answer: B. 85% magnesia cement and glass wool
- A. Tar dolomite bricks followed by asbestos
- B. 85% magnesia cement and glass wool
- C. Cotton followed by aluminium foil
- D. Fireclay refractory followed by aluminium sheet
Explanation
Steam pipelines commonly use magnesia-based insulation, often with glass wool, because it has low thermal conductivity and can withstand elevated temperatures. The 85% magnesia cement and glass wool combination is therefore the standard choice among these options.
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