Description

1.1 This test method covers a rapid and simple field determination of mercaptans in natural gas pipelines. Available detector tubes provide a total measuring range of 0.5 to 160 ppm by volume of mercaptans, although the majority of applications will be on the lower end of this range (that is, under 20 ppm). Besides total mercaptans, detector tubes are also available for methyl mercaptan (0.5 to 100 ppm), ethyl mercaptan (0.5 to 120 ppm), and butyl mercaptan (0.5 to 30 mg/M³ or 0.1 to 8 ppm).

Note 1: Certain detector tubes are calibrated in terms of milligrams per cubic metre (mg/M³) instead of parts per million by volume. The conversion is as follows for 25°C (77°F) and 760 mm Hg.

Equation D1988-06R15_1