Chemical Tankers / Day 3 / Day 3 Topic 4 Wall-Wash & Analysis
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Chemical Training
Wall Wash Techniques and Sample Analysis
Wall Wash Techniques and Sample Analysis
4.1Wall wash requirements. (wall wash tests: Hydrocarbon ,Chloride, Permanganate test, Colour test, Odour test , precautions to be taken for test equipment prior use, PRACTICAL EXERCISE)
4.2Wall wash kit contents.
4.3Tank Cleanliness standard.
Wall Wash Techniques and Sample Analysis
Movie: Tank Cleanliness Standards
Wall Wash Techniques and Sample Analysis
Wall-Wash
Wall Wash Techniques and Sample Analysis
At best, many Junior Officers see a wall-wash when standing by at the top of a tank and an analysis over the Chief Officer’s shoulder in the laboratory. During tank-cleaning, the Chief Officer is at his busiest and will have little time to pause and explain what he is doing
It is up to you to find time, to complete Wall Wash training and to ask the Captain or Chief Officer to explain the techniques with you during a quieter period aboard ship
Wall Wash Techniques and Sample Analysis
It is essential that the vessel always carries sufficient stock of equipment and materials for its expected trading pattern and that it is at all times clean and ready for use.
Wall Wash Techniques and Sample Analysis
The following slide is a suggested minimum stock for a ships wall wash kit.
Ships engaged in regular trades lifting large volumes of wall wash cargoes will need to adjust accordingly.
Note that items such as permanganate crystals and silver nitrate have a limited storage life.
Ensure that plastic gloves are supplied, not latex type dusted with powder that can ruin the permanganate test.
Standard Methanol Test Kit
|
Laboratory Pure Methanol for wall wash |
150 liters |
|
Deionized (D.I.) Water for testing |
150 liters |
|
Silver Nitrate Solution 10% with squeeze top |
(8 ounces) 225 grams |
|
3% Peroxide with 2% Hydrochloric Acid Solution |
1 liter |
|
Disposable Plastic Golves (not latex) |
200 pieces |
|
Washing bottles conventional polyethylene |
6x500 ML |
Graduated cylinders “pyrex” brand, with bases, glass, single
|
metric scale, calibrated to contain100 ML, glass stoppered |
15 pieces |
|
Pen Light flashlight, with batteries |
2 pieces |
|
Wooden stand for graduated cylinders |
2 piece |
|
Pipette “pyrex”brand 10 ML size |
2 pieces |
|
Pre-measured permanganate crystals 0.1 grams |
10 capsules |
|
Half liter amber (brown) bottles |
2 pieces |
|
Plastic funnels for wall washing |
4 pieces |
|
Standard Stock Salt Solution |
1 liter |
|
Jars (sample) round, wide mouth, 16 ounce (450ML) |
50 pieces |
|
Nessler tubes, 50 ML with stoppers |
15 pieces |
|
Twenty percent (20%) solution Nitric Acid |
1 liter |
Wall Wash Techniques and Sample Analysis
Wall Wash Procedure:
An outline of the basic techniques
The over-riding principle is cleanliness. Any contamination will affect the results of the analysis. This ranges from dirty equipment to poor technique and care is necessary to guarantee accurate and representative results