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ASTM D1142-95(2021)
Standard Test Method for Water Vapor Content of Gaseous Fuels by Measurement of Dew-Point Temperature
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NORM herausgegeben am 1.7.2021
Informationen über die Norm:
Bezeichnung normen: ASTM D1142-95(2021)
Ausgabedatum normen: 1.7.2021
SKU: NS-1029876
Zahl der Seiten: 11
Gewicht ca.: 33 g (0.07 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Kategorie - ähnliche Normen:
Die Annotation des Normtextes ASTM D1142-95(2021) :
Keywords:
gaseous fuels, natural gas,, ICS Number Code 75.160.30 (Gaseous fuels)
Ergänzende Informationen
| Significance and Use |
|
3.1?Generally, contracts governing the pipeline transmission of natural gas contain specifications limiting the maximum concentration of water vapor allowed. Excess water vapor can cause corrosive conditions, degrading pipelines and equipment. It can also condense and freeze or form methane hydrates causing blockages. Watervapor content also affects the heating value of natural gas, thus influencing the quality of the gas. This test method permits the determination of water content of natural gas. |
| 1. Scope |
|
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 dewpoint 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 Note 2:?Condensation of water vapor on the dew-point mirror
may appear as liquid water at temperatures as low as 0 to ?10?F
(?18 to ?23?C). At lower temperatures an ice point rather than a
water dew point likely will be observed. The minimum dew point of
any vapor that can be observed is limited by the mechanical parts
of the equipment. Mirror temperatures as low as ?150?F (?100?C)
have been measured, using liquid nitrogen as the coolant with a
thermocouple attached to the mirror, instead of a thermometer
well.
1.2?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.3?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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