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PTT (Improving Test Results by Washing with Potassium Permanganate)

PTT (Improving Test Results by Washing with Potassium Permanganate)

Causes of PTT Failures: A failure of a PTT occurs only when a contaminant reacts with Potassium Permanganate. Such reactions are caused by all inhibited products and organic matter. Potassium Permanganate does not react with hydrocarbons. Recommended Procedure: By spraying, or recirculation washing, the tank with Potassium Permanganate you will pass the PTT time (just by pre-empting the surveyors medium).  First, clean the tank has to a water-white standard before applying the Potassium Permanganate by spraying.  The different ways of…

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PTT (Improving Test Results)

PTT (Improving Test Results)

Oxidized residues of previous cargoes can cause a failure of the PTT. To improve the results, wash with a Sodium Hypochlorite Solution (Bleach) in freshwater. Sodium Hypochlorite is normally supplied as a 12% solution. Make a 2% solution of this supplied 12% solution in water (freshwater preferred, otherwise seawater) and recirculation wash at a maximum temperature of 40 deg C. 2% of a supplied 12% solution is 200 liters in 10,000 liters of water. Also used to remove red/yellow dye…

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