ASTM D1142-95(2012)

1.1 This test method covers the determination of the water vapor content of gaseous fuels by measurement of the dew-point temperature and the calculation therefrom of the water vapor content.

Note 1—Some gaseous fuels contain vapors of hydrocarbons or other components that easily condense into liquid and sometimes interfere with or mask the water dew point. When this occurs, it is sometimes very helpful to supplement the apparatus in Fig. 1 with an optical attachment that uniformly illuminates the dew–point mirror and also magnifies the condensate on the mirror. With this attachment it is possible, in some cases, to observe separate condensation points of water vapor, hydrocarbons, and glycolamines as well as ice points. However, if the dew point of the condensable hydrocarbons is higher than the water vapor dew point, when such hydrocarbons are present in large amounts, they may flood the mirror and obscure or wash off the water dew point. Best results in distinguishing multiple component dew points are obtained when they are not too closely spaced.

FIG. 1 Bureau of Mines Dew-Point Apparatus

Author	ASTM
Editor	ASTM
Document type	Standard
Format	File
Confirmation date	2012-11-01
ICS	75.160.30 : Gaseous fuels
Number of pages	11
Replace	ASTM D1142-95(2006)
Set	ASTMVOL0506
Year	2000
Document history	ASTM D1142-95(2006)
Country	USA
Keyword	ASTM 1142;ASTM D1142;ASTM D1142;10.1520/D1142-95R12