| 摘要 |
1,117,600. Determining the pour point. ESSO RESEARCH & ENG. CO. July 26, 1966 [ Oct. 5, 1965], No. 33632/66. Heading G1S. In a method for determining the pour point of a liquid e.g. oil, a conduit 21 is filled with a sample of the liquid and cooled to a temperature below its pour point, whereupon a pressure is applied to one end of the conduit and the temperature raised until the pressure applied to the one end of the conduit is transmitted to the other end. As shown in Fig. 2, the conduit 21 is surrounded by a thermo-electric cooling unit 58 and connected to pressure lines 24, 36. In use, the sample is fed from a pipe line 10 see Fig. 1 (not shown) to the conduit 21 and cooled to a predetermined temperature below the pour point of the sample which is detected by thermo-couples 52. Subsequently air pressure is directed at one end of the sample and the temperature raised until a pressure signal is detected at switch 40, the temperature detected by thermo-couple 52 being recorded. |
