Discussion
Match the trouble with what causes it.
1. Caustic embrittlement 2. Priming 3. Scale
P. Water carried over with the steam Q. Free alkali at stressed joints R. Calcium sulphate deposited on hot surfaces
Answer: B
Correct answer: 1-Q, 2-P, 3-R
Three distinct boiler troubles with three distinct causes. Caustic embrittlement is intergranular cracking where free alkali concentrates in the crevices at riveted or stressed joints. Priming is the carrying over of water with the steam. And scale is the hard deposit left where a salt such as calcium sulphate becomes less soluble at the hot surface and crystallises on to it.
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