TANK CLEANING - PART 3

Code No: 503

Video Running Time: 18 minutes

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This is part of a series of five videos that uses computer graphic techniques with animated sequences to produce concise, visually effective and informative training material. A full voice commentary describes and reinforces the highly detailed visual images.

The videos take as an example a 170,000 dwt segregated ballast tanker (no double bottom) with 7 cargo tanks, 2 slop tanks and 3 cargo pumps. The capacity of the cargo pumps is 4000 m3/hour.

Part 3 - This video describes the operation of tank cleaning to a gas-free condition as required for example prior to entry into dry dock. Firstly check the tanks are properly inerted. Also at this time it is important to pay careful attention to the condition and content of the heating coils, ensure they are all clean. Tank cleaning uses cleaning units, or guns mounted inside the tank. Their use involves setting the gun’s nozzle sweep area to clean the tank’s sides then tank bottoms. Pumps and lines are set to ensure a closed washing cycle. Following cleaning each tank is purged with inert gas. After testing, tanks are then in turn vented with fresh air to complete the gas-freeing operation. Finally tanks are entered for inspection purposes with all due precautions being taken.