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

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MSC 85/26/Add.2ANNEX 3Page 3583.1.2.2 The pedestal shall be 10 inches to 11 inches (250 mm to 275 mm) square at the top,and 15 inches to 16 inches (375 mm to 400 mm) square at the bottom, 25 inchesto 30 inches (625 mm to 750 mm) in height, and shall be of monolithic construction, cast fromconcrete weighing at least 140 lb/ft 3 (2240 kg/m 3 ). A stable gasket cork pad, ½ inch (13 mm)thick and approximately 4 inches (102 mm) square, shall be inserted under each corner of thepedestal. The flow table shall be checked frequently for levelness of the table top, stability of thepedestal, and tightness of the bolts and nuts in the table base and the pedestal plate. (A torqueof 20 lb ft (27 Nm) is recommended when tightening those fastenings.)3.1.2.3 The table top, after the frame has been mounted on the pedestal, shall be level alongtwo diameters at right angles to each other, in both the raised and lowered positions.3.1.3 Flow table lubrication3.1.3.1 The vertical shaft of the table shall be kept clean and shall be lightly lubricated with alight oil (SAE-10). Oil shall not be present between the contact faces of the table top and thesupporting frame. Oil on the cam face will lessen wear and promote smoothness of operation.The table should be raised and permitted to drop a dozen or more times just prior to use if it hasnot been operated for some time.3.1.4 Mould3.1.4.1 The mould for casting the flow specimen shall be of cast bronze or brass, constructed asshown in figure 3. The Rockwell hardness number of the metal shall be not less than HRB 25.The diameter of the top opening shall be 2.75 inches + 0.02 inches (69.8 mm + 0.5 mm) for newmoulds and 2.75 inches + 0.05 inches (+ 1.3 mm) and – 0.02 inches for moulds in use.The surfaces of the base and top shall be parallel and at right angles to the vertical axis of thecone. The mould shall have a minimum wall thickness of 0.2 inches (5 mm). The outside ofthe top edge of the mould shall be shaped so as to provide an integral collar for convenient liftingof the mould. All surfaces shall be machined to a smooth finish. A circularshield approximately 10 inches (254 mm) in diameter, with a centre openingapproximately 4 inches (102 mm) in diameter, made of non-absorbing material not attacked bythe cement, shall be used with the flow mould to prevent mortar from spilling on the table top.3.2 Scales and weights *3.2.1 Scales3.2.1.1 The scales used shall conform to the following requirements. On scales in use, thepermissible variation at a load of 2000 g shall be + 2.0 g. The permissible variation on newscales shall be one half of this value. The sensibility reciprocal ** shall be not greater than twicethe permissible variation.***Source, “Standard Method of Test for Compressive Strength of Hydraulic Cement Mortars”,Designation C109-3. Reprinted by permission of American Society for Testing and Materials (ASTM), 1916Race Street, Philadelphia, Penn., USA, copyright ASTM 1977.Generally defined, the sensibility reciprocal is the change in load required to change the position of rest of theindicating element or elements of a non-automatic indicating scale a definite amount at any load. For a morecomplete definition, see “Specifications, Tolerances, and Regulations for Commercial Weighing and MeasuringDevices”, Handbook H44, National Bureau of Standards, Washington, D.C., USA, September 1949, pp. 92and 93.I:\MSC\85\26-Add-2.doc
MSC 85/26/Add.2ANNEX 3Page 3593.2.2 Weights3.2.2.1 The permissible variations on weights shall be as prescribed in the table below.The permissible variations on news weights shall be one half of the values in the table below.PERMISSIBLE VARIATIONS ON WEIGHTSWeight (g)Permissible variationson weights in use,plus or minus (g)1000 ......................................... 0.50900 ......................................... 0.45750 ......................................... 0.40500 ......................................... 0.35300 ......................................... 0.30250 ......................................... 0.25200 ......................................... 0.20100 ......................................... 0.1550 ......................................... 0.1020 ......................................... 0.0510 ......................................... 0.045 ......................................... 0.032 ......................................... 0.021 ......................................... 0.01I:\MSC\85\26-Add-2.doc
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MSC 85/26/Add.2 ANNEX 3 RESOLUTION MSC.268(85) - US Coast ...

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