To understand the importance of the ASTM D1142 PDF, one must first grasp the concept of Hydrocarbon Dew Point. Natural gas is not a single compound; it is a mixture of methane, ethane, propane, butanes, pentanes, and heavier components (hexanes and heptanes plus).
The method works on a fundamental principle: cooling a polished metal mirror or surface while exposed to the gas sample and observing the temperature at which condensation first appears (the dew point). Once the dew-point temperature is known, the water vapor content is calculated using standard psychrometric or gas laws.
A: No direct equivalent. ISO 6327 (gas analysis – dew point by cooled surface condenser) is similar but not identical. astm d1142 pdf
The PDF includes a sample calculation—always replicate that with your own numbers to verify your method.
Disclaimer: This article is for informational purposes only. Prices, statuses, and standards are subject to change. Always consult ASTM International directly for the most current information. To understand the importance of the ASTM D1142
ASTM D1142 has been officially withdrawn. However, it is still referenced in legacy contracts, older engineering specifications, and historical data analysis. Understanding its status is critical before you download any file.
ASTM International sells all its standards, including withdrawn ones, through its official website. Here is the correct procedure: Once the dew-point temperature is known, the water
As of the last decade, . Why?
The calculation of dew point is non-linear and complex. The standard utilizes Equations of State to model the behavior of the gas mixture. These mathematical models relate pressure, volume, and temperature. The standard may provide guidance on the convergence of pressure and temperature parameters to find the point where the vapor fraction equals 1.0 (saturated vapor).
If an engineer needs to rely on the numbers—dew-point tables, pressure corrections, or calculation examples—only the official PDF is trustworthy.