Engine : Motor Plants and Auxiliary Boilers - 1312/947
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| Casing drains may be required on a waste heat boiler gas passage to __________. |
| A) prevent an accumulation of boiler water entering gas passages as a result of a pinhole tube leak |
| B) provide a means to sample stack gases for testing purposes |
| C) release excess pressure |
| D) drain off condensation |
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