5. Transform Active Voice into Passive

1. Small-scale refrigerators use non-cyclic method.

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2. External equalized valve provides maximum heat transfer for evaporator.

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3. They have just fitted large condenser with several support plates.

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4. Now they are brazing copper connections of Alcoil quick condenser.

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5. ETO Engineer must provide timely maintenance of all electrical equipment and refrigeration plant also.

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Reading

6. Read the text, and mark the following statements as true or false.

This unfortunate incident occurred on a fishing vessel whilst unloading a catch from the vessel’s holds. A shore side crane, operated by a stevedore, was being used to discharge fish. During a load, heavy contact was made with one of the vessel’s refrigeration pipes causing it to rupture at the weld and leak ammonia gas into the hold. Three stevedores assisting with the operation managed to leave the hold when the ammonia started to leak. However, the stevedore who was closest to the pipe when ruptured suffered severe ammonia burns to his eyes and lungs. His injuries were so severe that it resulted in instant hospitalisation, with the prognosis of ongoing medical care for the rest of his life.

It is industry practice to isolate a hold’s refrigeration system by draining back the ammonia into the reserve storage before unloading commences. This is to ensure that no leakage of ammonia gas occurs if there is a breach in the system.

The subsequent investigation into the incident found that the vessel’s refrigeration system, which utilised ammonia, had not been fully isolated and therefore ammonia gases had not been vacuumed from the system when unloading had commenced. Only after the leak had occurred were the valves fully closed, completely isolating the system and preventing further ammonia entering the hold.ƒ

It is imperative to check that the vessel’s refrigeration system is fully isolated and vacuumed prior to any operations being carried out in the hold. Failure to do so potentially exposes anyone in the vicinity to the risk of severe injury or death if the system is damaged and a leak occurs.

In this incident it was the chief engineer’s responsibility to isolate the system but the subsequent investigation discovered that he had been late to begin the isolation process. This resulted in the gas not being fully vacuumed from the system. In addition, the isolation valves had not been properly closed when unloading had begun due to a lack of time.

	True	False
1. The incident occurred on a trawler vessel whilst unloading a catch from the vessel’s holds.
2. A shore side crane, operated by a stevedore, was being used to load fish.
3. During a load, heavy contact was made with one of the vessel’s refrigeration pipes causing it to distort at the weld and leak ammonia gas into the hold.
4. Three stevedores managed to escape when the ammonia started to leak.
5. The stevedore who was closest to the pipe suffered severe ammonia scalds to his eyes and lungs.
6. Casualty resulted in instant hospitalisation, with terrible prognosis for the health of injured person.
7. Usually a hold’s refrigeration system is isolated by draining back the ammonia into the reserve storage before unloading.
8. Anyone in the vicinity will be exposed to the risk of severe injury or death if the system is damaged and a leak occurs.
9. In this incident it was the chief officer’s responsibility to isolate the system.
10. The gas was fully vacuumed from the system.

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