MSC 85/26/Add.2 ANNEX 3 RESOLUTION MSC.268(85) - US Coast ...

MSC 85/26/Add.2ANNEX 3Page 3522 Test procedures to determine the angle of repose and associated apparatus2.1 Determination of angle of repose of fine-grained materials (size less than 10 mm):“tilting box test”. For use in laboratory or port of loading2.1.1 ScopeThe test provides for the determination of the angle of repose of fine-grained non-cohesivematerials (size less than 10 mm). The results so obtained may be used when interpretingsections 5 and 6 of this Code for the materials in question.2.1.2 DefinitionThe angle of repose obtained by this test is the angle formed between the horizontal and the topof the testbox when the material in the box just begins to slide in bulk.2.1.3 Principle of testWhen measuring the angle of repose by this method, the material surface should initially be leveland parallel to the testbox base. The box is tilted without vibration and tilted without vibrationand tilting is stopped when the product just begins to slide in bulk.2.1.4 Apparatus (see figure 2.1.4)Apparatus is as follows:.1 A framework, on top of which is attached an open box. Attachment of the box tothe frame is by means of a shaft passing through bearings affixed to both theframe and the end of the box, enabling the box to be subjected to a controlled tilt..2 The dimensions of the box are 600 mm long, 400 mm wide and 200 mm high..3 To prevent sliding of the material along the bottom of the box during tilting, atightly fitting grating (openings 30 mm x 30 mm x 25 mm) is placed on thebottom of the box before filling..4 Tilting of the box is effected by a hydraulic cylinder fitted between the frame andthe bottom of the box. Other means may be used to obtain the required tilting butin all cases vibration must be eliminated..5 To pressurize the hydraulic cylinder, a hydropneumatic accumulator may be used,pressurized by air or gas at a pressure of about 5 kp/cm 2 ..6 The rate of tilting should be approximately 0.3 o /s..7 Range of tilt should be at least 50 o .I:\MSC\85\26-Add-2.doc