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D130_11 (12)

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There are a variety of test conditions which are broadly specific to given classes of product, but within certain classes more than one set of test conditions of time or temperature or both may apply. In general, aviation gasoline shall be tested in a pressure vessel at 100 degrees Celsius and other high vapor pressure fuels like natural gasoline, at 40 degrees Celsius. Other liquid products shall be tested in a test tube at 50 degrees Celsius, 100 degrees Celsius, or even higher temperatures. The conditions of time and temperature given below are commonly used, and are quoted in the ASTM specifications for these products where such specifications exist. They are however guides only. Other conditions can also be used when required by specifications, or by agreement between parties. The test conditions of time and temperature shall be recorded as part of the result. See 13.1 of the written standard. Pressure vessel procedure. For use with aviation gasoline and higher vapor pressure samples, place 30 milliliters of sample completely clear and free of any suspended or entrained water-- see 9.3 of the written standard-- into a chemically cleaned and dry 25 millimeter by 150 millimeter test tube. Within one minute after completing the final preparation, polishing, slide the copper strip into the sample tube, place the sample tube into the pressure vessel-- see figure 1 of the written standard-- and screw the lid on tightly. If more than one sample is to be analyzed at essentially the same time, it is permissible to prepare each pressure vessel in the batch before completely immersing each pressure vessel in the liquid bath at 100 plus or minus 1 degree Celsius, 212 plus or minus 2 degrees Fahrenheit, provided the elapsed time between the first and last samples is kept to a minimum. After two hours plus or minus five minutes in the bath, withdraw the pressure vessel and immerse for a few minutes in cool water-- tap water. Open the pressure vessel, withdraw the test tube, and examine the strip as described in 11.4 of the written standard. Carry out the test exactly as described in 11.2.1, but at 40 degrees Celsius, 104 degrees Fahrenheit, and for three hours plus or minus five minutes. Carry out the test exactly as described in 11.2.1, but at 50 plus or minus 1 degree Celsius, 122 plus or minus 2 degrees Fahrenheit, and for three hours plus or minus five minutes. See 13.2 of the written standard in the report section regarding the need to report that a pressure vessel was used in conducting this testing option to differentiate between automotive gasoline samples analyzed by the procedure in 11.3.1 using the test tube procedure. Test tube procedure for use with most liquid products. Place 30 milliliters of sample completely clear and free of any suspended or entrained water-- see 9.3 of the written standard-- into a chemically clean, dry 25 millimeter by 150 millimeter test tube. And within one minute after completing the final preparation, polishing, slide the copper strip into the sample tube. If more than one sample has to be analyzed at essentially the same time, it is permissible to prepare each sample in the batch by stoppering each tube with a vented stopper such as a vented cork, before placing each tube in a bath maintained at 50 plus or minus 1 degree Celsius, 122 plus or minus 2 degrees Fahrenheit, provided the elapsed time between the first and last sample prepared is kept to a minimum. Protect the contents of the test tube from strong light during the test. After three hours plus or minus five minutes in the bath, examine the strip as described in 11.4 of the written standard. For test on fuel oil and diesel fuel to specifications other than specifications D396 and D975, a temperature of 100 degrees Celsius, 212 degrees Fahrenheit for three hours, is often used as an alternative set of conditions. Some automotive gasoline's with vapor pressure above 80 kilopascals at 37.8 degrees Celsius have exhibited evaporation losses in excess of 10% of their volume. If such evaporation losses are apparent, it is recommended that the pressure vessel procedure-- see sections 11.2 and 11.2.3-- be used. In addition, if the lab decides it wants to minimize or mitigate any evaporation losses associated with the analysis of automotive gasolines, even if the corresponding vapor pressure is less than or equal to 80 kilopascals, the option exists for the lab to test samples using the pressure vessel procedure. See sections 11.2 and 11.2.3. Carry out the test exactly as described in section 11.3.1, but at 100 plus or minus 1 degrees Celsius, 212 plus or minus 2 degrees Fahrenheit. Carry out the test exactly as described in 11.3.1, but the tests can be carried out for varying times, and at elevated temperatures other than 100 degrees Celsius, 212 degrees Fahrenheit. For the sake of uniformity, it is suggested that even increments of 5 degrees Celsius beginning with 150 degrees Celsius be used. Empty the contents of the test tube into a suitably sized receiver. If a receiver made out of glass is used, such as a 150 milliliter tall form beaker, let the strip slide in gently, so as to avoid breaking the glass. Immediately withdraw the strip with forceps and immerse in wash solvent. Withdraw the strip at once, dry, and inspect for evidence of tarnishing or corrosion by comparison with the copper strip corrosion standards. The step of drawing the strip may be done by blotting with filter paper, air drying, or by other suitable means. Hold both the test strip and the standard strip plaque in such a manner that light reflected from them, at an angle of approximately 45 degrees, will be observed. In handling the test strip during the inspection and comparison, the danger of marking or staining can be avoided if it is inserted in a flat glass tube-- see appendix X1 of the written standard-- which can be stoppered with absorbent cotton.

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Posted by: abuckmaster on Aug 22, 2018

D130_11 (12)

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