7. Number the sequence of events

a.	A shore side crane was being used to discharge fish.	_____
b.	Investigation revealed that gas had not been fully vacuumed.	_____
c.	Leak of ammonia gas into the hold occurred.	_____
d.	The valves were fully closed only after the leak had occurred.	_____
e.	The incident occurred whilst unloading a catch from the vessel’s holds.	_____
f.	The chief engineer had been late to begin the isolation of refrigeration system as the subsequent investigation discovered.	_____
g.	Ammonia gases had not been vacuumed from the system when unloading had commenced.	_____
h.	Heavy contact was made with one of the vessel’s refrigeration pipes causing it to rupture at the weld.	_____
i.	The closest to the pipe stevedore suffered severe ammonia burns to his eyes and lungs.	_____
j.	Investigation revealed that isolation valves had not been properly closed.	_____

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Writing

8. Describe refrigeration cycle using the scheme (100-120 words)

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