Chemical Tankers / Day 3 / Day 3 Topic 5 Tank Cleaning Guidelines

5.1 Existing guidelines

Miracle Tank Cleaning Guide is issued by ChemServe Laboratory in Germany. This Guide may be distributed in electronic and paper format and updated twice a year.

5.1 Existing guidelines

Miracle Tank Cleaning Guide

Miracle Tank cleaning guide advise to clean Ethyl Acetate, page 1.

5.1 Existing guidelines

Miracle Tank Cleaning Guide

Miracle Tank cleaning guide advise to clean Ethyl Acetate, page 2.

5.2 Chemical Manual Guidelines

Before commencement of tank cleaning operations the following Chapter’s of Company Chemical Guidelines should be consulted and understood:

5.2 - VMS Chemical Procedures Guidelines

oChapter 11.3 – Type and condition of Tank Coatings;

oChapter 11.4.1 – General instructions, including a definition of Water White standard;

oChapter 11.4.2 - Cleaning Program and Plan Preparations;

oChapter 11.4.4 – Safety precautions during the tank cleaning operations;

5.2 - VMS Chemical Procedures Guidelines

oChapter 11.5.1 – Definitions of tank washing atmospheres;

oChapter 11.5.2 – Precautions when tank washing in an inert atmosphere;

oChapter 11.5.3 – Precautions when tank washing in an undefined atmosphere;

oChapter 11.6 – Cleaning methods;

5.2 - VMS Chemical Procedures Guidelines

oChapter 11.6.2 – Cleaning process description with recommendations for certain cargoes;

oChapter 11.6.3 – Cleaning with cleaning agent;

oChapter 11.6.4 – Steaming;

oChapter 11.6.7 – Drying process;

oChapter 11.6.8 – Tank cleaning slops;

5.2 - VMS Chemical Procedures Guidelines

oChapter 11.7 – Sweeping of tanks;

oChapter 11.8 – Pickling and passivation;

oChapter 11.9 – Standards of tank cleanliness;

oChapter 11.9.2 – Water White Standard cleanliness;

oChapter 11.9.3 – Wall Wash Standard;

5.2 - VMS Chemical Procedures Guidelines

The following methods are not acceptable or allowed to be carried out

as per Company instructions General Safety principles:

oToluene or other static accumulator spraying;

oToluene or other static accumulator re-circulation in non inerted tanks;

oUsing Caustic Soda solutions in zinc coated tanks;

oChlorinated solvent spraying;

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5.2 - VMS Chemical Procedures Guidelines

oMixing chlorinated solvents with water (forms acid compounds);

oUsing acid based cleaning chemicals in zinc coated tanks;

oSteaming of tanks containing flammable vapors;

oBleach solution should not be used in zinc and epoxy coated tanks without approval;

oPartial cleaning of cargo tank instead of whole surface;