Corrosiveness to copper from petroleum products by Copper Strip test
6. Apparatus
6.1 Copper Strip Corrosion Pressure Vessel, constructed from stainless steel according to the dimensions as given in Fig. 1. The vessel shall be capable of withstanding a test pressure of 700 kPa gage (100 psi). Alternative designs for the vessel's cap and synthetic rubber gasket may be used provided that the internal dimensions of the vessel are the same as those shown in Fig. 1. The internal dimensions of the pressure vessel are such that a nominal 25-mm by 150-mm test tube can be placed inside the pressure vessel.
6.2 Test Tubes, of borosilicate glass of nominal 25-mm by 150-mm dimensions. The internal dimensions shall be checked as acceptable by use of a copper strip (see 7.3). When 30 mL of liquid is added to the test tube with the copper strip in it, a minimum of 5-mm of liquid shall be above the top surface of the strip.
6.3 Test Baths
6.3.1 General - All test baths shall be able to maintain the test temperature to within 61°C (2°F) of the required test temperature.
6.3.2 Liquid Bath Used for Submerging Pressure Vessel(s) - The bath shall be deep enough to submerge one or more pressure vessels (see 6.1) completely during the test. As the bath medium, use water or any liquid that can be satisfactorily controlled to the sample test temperature. The bath shall be fitted with suitable supports to hold each pressure vessel in a vertical position when submerged.
6.3.3 Bath(s) Used for Test Tubes - Liquid baths shall be fitted with suitable supports to hold each test tube (see 6.2) in a vertical position to a depth of about 100-mm (4-in.) as measured from the bottom of the test tube to the bath surface. As a liquid bath medium, water and oil have been found satisfactory and controllable at the specified test temperature. Solid block baths shall meet the same temperature control and immersion conditions and shall be checked for temperature measurement (heat transfer) for each product class by running tests on tubes filled with 30 mL of product plus a metal strip of the nominal dimensions given, plus a temperature sensor.
6.4 Temperature Sensing Device (TSD), capable of monitoring the desired test temperature in the bath to within an accuracy of 61°C or better. The ASTM 12C (12F) (see Specification E1) or IP 64C (64F) total immersion thermometers have been found suitable to use in the test. If used, no more than 10-mm (0.4-in.) of the mercury should extend above the surface of the bath at the test temperature.
6.5 Polishing Vise, for holding the copper strip firmly without marring the edges while polishing. Any convenient type of holder (see Appendix X1) may be used provided that the strip is held tightly and that the surface of the strip being polished is supported above the surface of the holder.
6.6 Viewing Test Tubes, flat glass test tubes, are convenient for protecting corroded copper strips for close inspection or storage (see Appendix X1 for the description of a flat-glass viewing tube). The viewing test tube shall be of such dimensions as to allow the introduction of a copper strip (see 7.3) and made of glass free of striae or similar defects.
6.7 Forceps, with either stainless steel or polytetrafluoroethylene (PTFE) tips, for use in handling the copper strips, have been found suitable to use.
6.8 Timing Device, electronic or manual, capable of accurately measuring the test duration within the allowable tolerance.
