John G Castano

US Patent:

42485991, Feb 3, 1981

Filed:

Sep 19, 1979

Appl. No.:

6/077251

Inventors:

Pierre R. Mommessin - Houston TX
John R. Castano - Houston TX
John G. Rankin - Houston TX
Mary L. Weiss - Spring TX

Assignee:

Shell Oil Company - Houston TX

International Classification:

G01N 3112
G01N 2172
G01N 900

US Classification:

23230HC

Abstract:

The API gravity of an oil is determined by vaporizing its volatile and pyrolyzable components, measuring the ratio of the amount vaporized within a range of relatively high temperatures to the total amount vaporized and determining that the gravity of the oil being tested equals that of an oil which has a similar composition and which, when a substantially equal amount is tested under substantially the same conditions, yields a similar ratio of amounts vaporized at the same temperatures.