Coker Deposit Measurement using Beta-Ray Backscatter.
Technical rept. Jun 68-Mar 72,
SHELL DEVELOPMENT CO EMERYVILLE CALIF
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The report describes the development and application of an instrument for the measurement of coker tube deposits. Operation is based on backscattered low energy beta rays and a thin window proportional detector housed in a vacuum chamber in which the tubes are examined. Hydrocarbon deposits in the range of 30 to 3000 A thickness can be measured with good accuracy. A description is given of backscatter theory, design of the instrument, and of examples of the successful application of the instrument to coker tubes of various sizes. Data from several fuel thermal stability studies are presented in terms of maximum deposit thickness and total deposit mass for each tube. It is comparable in accuracy to combustion determination and has the added advantages of being nondestructive and of providing a complete deposit profile along the tube. Sufficient detail is included so that the report may be used as an operators manual. Author
- Test Facilities, Equipment and Methods