A small gas tanker was on a loaded coastal voyage. Prior to arrival at the discharge port, the chief engineer and a company superintendent who was on board to carry out an inspection of the vessel, planned to test the operation of QCVs in the fuel oil (FO) and diesel oil (DO) tanks. At about 11:30, both the chief engineer and superintendent positioned themselves near the FO service tank and ordered the tripping of the tank's QCV from the remote emergency control station.

After confirming proper closing, the QCV was manually opened and reset. It was then decided to break for lunch. At about 12:40 hrs, when one hour's notice of arrival had been given by the bridge, the Chief Engineer returned to the engine room.

The Hong Kong Marine Department issues Merchant Shipping Information Note regarding Entry into Enclosed Space as follows:

Two similar accidents occurred recently on board two Hong Kong registered chemical tankers causing death of a Chief Officer and a Bosun respectively inside enclosed spaces. This Note draws the attention of the Shipowners, Ship Managers, Ship Operators, Masters, Officers and Crew of Hong Kong registered ships and Classification Societies the important lessons learnt from these accidents.