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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