Sharjah Chemical Sharjah,
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The tank cleaning suggestions in this manual are guidelines and will be updated based on future experience. Sufficient tank cleaning should be performed after every discharge, irrespective of the next cargo to be loaded. Due to quality reasons many chemical products require ever-higher cleaning standards and improved analytical methods are able to detect any impurities or residues of prior cargoes. Survey companies will therefore perform more and more wall wash tests. Not only chlorides and water miscibility (Hydrocarbons) will be tested.
Additionally the non volatile matter (NVM), the colour, the permanganate fading time (PTT), as well as ultra violet transmission (UV) will be tested. A.m. tests will be especially performed after vegetable or mineral oils, but also after various other restricted prior cargoes like paraffin’s, phthalates, olefins and other hydrocarbon products and chemicals. A fundamental understanding of the cargo to be cleaned as well as the cargo to be loaded is therefore of utmost importance for an efficient tank cleaning. Before loading of sensitive cargoes it is advisable to clean tanks and lines finally with a suitable cleaning solution in order to achieve the required cleaning standard.
Water hardness is formed by the calcium and magnesium content of the water. Sea water has a very high water hardness. Some products like fatty acids and vegetable oils with a high free fatty acid content will form white sticky residues, if they are cleaned with a water of a high water hardness (e.g. sea water)
Drying and semi-drying vegetable and animal oils react with oxygen to form a varnish-like polymeric film. This is very difficult to remove from the bulkheads etc. Since heat increases the reaction speed the initial washing of these products must be done with water at ambient temperature without any delay after unloading the cargo.
Evaporation of volatile substances Cargoes consisting of mixtures with different vapor pressures should neither be cleaned by evaporation, nor prewashed hot. The evaporation of the light substances from a mixture could result in non-volatile residues, which are very difficult to remove.
The initial wash of products that tend to polymerise should be carried out with cold (ambient) water. Washing with hot water may result in polimeric residues being left in tanks and lines, which are very difficult to remove.
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