2.2 Alternative or shipboard test method to be used for the determination of the angle of repose when the tilting box is not available
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Statutory Documents - IMO Publications and Documents - International Codes - IMSBC Code – International Maritime Solid Bulk Cargoes Code – Resolution MSC.268(85) - Appendix 2 – Laboratory Test Procedures, Associated Apparatus and Standards - 2 Test procedures to determine the angle of repose and associated apparatus - 2.2 Alternative or shipboard test method to be used for the determination of the angle of repose when the tilting box is not available

2.2 Alternative or shipboard test method to be used for the determination of the angle of repose when the tilting box is not available

  2.2.1 Definition

 According to this method the angle of repose is the angle between the cone slope and the horizontal measured at half height.

  2.2.2 Principle of test

 To determine the angle of repose, a quantity of the material to be tested is poured very carefully out of a flask onto a sheet of rough-textured paper, in such a way that a symmetrical cone is formed.

  2.2.3 Equipment

 The necessary equipment to carry out this test is as follows:

  • – a horizontal table free from vibrations;

  • – a sheet of rough-textured paper onto which the material should be poured;

  • – a protractor; and

  • – a 3-L conical flask.

  2.2.4 Procedure

 Put the sheet of paper on the table. Split 10 L of the material to be tested into three subsamples and test each in the following way:

 Pour two thirds of the subsample (i.e. 2 L) onto the sheet, producing a starting cone. The remainder of this subsample is then poured very carefully from a height of a few millimetres on top of the cone. Care should be taken that the cone will be built up symmetrically. This may be achieved by revolving the flask slowly close around the top of the cone when pouring.

 When measuring, care should be taken that the protractor does not touch the cone; otherwise this may result in sliding of the material and spoil the test.

 The angle has to be measured at four places around the cone, about 90° apart.

 This test should be repeated on the other two subsamples.

  2.2.5 Calculations

 The angle of repose is taken as the mean of the 12 measurements and is reported to half a degree. This figure can be converted to the tilting box value as follows:

Where at = angle of repose according to the tilting box text

as = angle of repose according to the survey test

Parent topic: 2 Test procedures to determine the angle of repose and associated apparatus
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