Engine : Expired / General Subjects - 641/881
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| For removal of sludge from in the inside of the shell of a fuel oil heater or lube oil cooler, what is typically the preferred method of cleaning? |
| A) Circulating hot distillate oil. |
| B) Blowing out with compressed air or a steam lance. |
| C) Chemical cleaning with descaling compounds. |
| D) Mechanical cleaning with specially designed brushes. |
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