Additional washing procedure Paraffin Wax
Additional Prewash procedure Paraffin Wax / persistent floaters
- Cargo must be unloaded at the proper temperature (at least > 10° above melt-ing point).
- As soon as the tank is empty, hot water shall be entered in the tank until the heating coils are flooded and heating coils shall be operated in order to heat up the tanks to melt the wax which is attached to the tank walls.
- Steam shall be used to heat up the tanks and tank walls for at least 1 to 2 hours, and subsequently washed with hot water (> 60°C – 80°C)
- As normal pre-wash procedures do not inflict sufficient effect, hot water (>60°C, preferably >80°C) must be used.
- The use of the regular K –factor is not sufficient, instead a time factor shall be used of at least 45 minutes for washing per tank.
- Adjacent ballastwater tanks must be kept empty (if possible).
- Collection tanks must be heated and effluent must be unloaded to PRF or termi-nal and subsequently pre-washed as well according above mentioned procedure;
- After unloading the washing water, ventilate the tanks to allow for visual inspec-tion.
- In case there are still excessive quantities of solid wax remaining in the tank(s), extra washing / disposal may be required.