Wall Wash test is common test on Chemical Tanker. Sometimes this test is also called Hydrocarbon test, Chloride Test, kMNo4 PTT test, HC test, pH test etc. The Chloride test is used to judge the presence of chlorides on bulkheads etc.
To understand in a better way, you may watch the videos.
Youtube Video: PTT test
Youtube Video : How to Test the pH Level – example
Youtube Video : Chloride test kit method
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