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BS 2000-48-2011 pdf free download
BS 2000-48-2011 pdf free download.Methods of test for petroleum and its products Part 48: Determination of oxidation characteristics of lubricating oil (Identical with IP 48/11).
5.1 Oxidation tubes, manufactured from borosilicate or neutral glass and conforming to the dimensions shown in Figure 1.
5.2 Absorption tubes, if required for reduction of objectionable atmospheric odours.
NOTE 1 The oxidation tube used in this method vents to the atmosphere and results in an unpleasant smell in some laboratories. This can be avoided by passing the issuing vapours through a tube containing water.
Absorption tubes shall conform to 5.1 and contain approximately 25 ml of water. The absorption tubes shall be mounted outside the bath and connected to the oxidation tubes. The length between the axis of the two tubes shall be 150 mm ±50 mm. The connection between the oxidation and absorption tubes shall be as short as possible and jointed to the vessels by means of short flexible sleeves (see note 2). To avoid evaporation of water, ensure the absorption tube is protected from the heating bath by insulation.
NOTE 2 Silicone rubber sleeving has been found to be suitable for this purpose.
5.3 Heating bath, an aluminium alloy block heater or oil bath thermostatically controlled to maintain the oil in the required number of oxidation tubes at a temperature of 200 °C ±0.5 VC (see Figure 2). This temperature shall be read on a thermometer, or a suitable temperature-measuring device (5.5), inserted to within 5 mm from the bottom of an oxidation tube containing 40 ml of oil (without an air supply) and placed in the heating bath. When using an aluminium block heater, the tubes shall be inserted into the holes to an overall depth of 150 mm. The depth of the holes in the heating part of the block shall be at least 125 mm and short metal collars, passing through the insulating cover and surrounding each oxidation tube, ensure heating over the 150 mm length of the tube. In the case of oil baths, the oxidation tubes shall be immersed to a depth of 137 mm in the oil and to an overall depth of 150 mm in the bath. For both types of heating bath the height of the oxidation tubes above the upper surface shall be 60 mm and the diameter of the holes shall be just sufficient to allow insertion of the specified tube. In case of slackness, a 25 mm diameter 0-ring may be placed around the tube and pressed against the heater surface.BS 2000-48-2011 pdf free download.
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