Methanol Importance during wall wash test
Methanol is very sensitive to oil contaminants. The following test method uses methanol as a testing medium. The methanol must therefore be guaranteed free from any hydrocarbon contaminants.
About one m2 of the tank wall is carefully washed with cotton and about 40 cc methanol. The methanol is wrung out and put into a test tube. Then 60 cc distilled water is added. The mixture is well shaken and left to settle for 20 min. If the solution remains a clear liquid the tank wall can be considered to be clean, but if the solution has turned milky or only slightly milky it is an indication that the tank should be cleaned again before loading methanol or any other oil-sensitive cargo.
This method should be a standard practice to be carried out by the ship's personnel. The method can, of course, also be used as a check on the cargo upon loading and discharging.
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