ASTM D7904
Standard Test Method for Determination of Water Vapor (Moisture Concentration) in Natural Gas by Tunable Diode Laser Spectroscopy (TDLAS)
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About This Item
ASTM D7904 is the ASTM standard for determining water vapor, or moisture concentration, in natural gas by tunable diode laser spectroscopy (TDLAS). It provides a technical basis for measuring moisture content with a laser-based method that is suited to gas quality monitoring and related testing needs. Because water vapor can affect natural gas handling, processing, and specification compliance, this standard helps support more consistent measurement and evaluation.
What is ASTM D7904?
ASTM D7904, titled Standard Test Method for Determination of Water Vapor (Moisture Concentration) in Natural Gas by Tunable Diode Laser Spectroscopy (TDLAS), defines a method for measuring moisture in natural gas using laser spectroscopy. The standard is centered on determining water vapor concentration rather than broader gas composition. As an ASTM standard, it provides a controlled test method that can support repeatable results, instrument-based measurement, and clearer technical communication in gas quality applications.
Where is ASTM D7904 used?
This standard is commonly used in natural gas measurement and quality control settings where water vapor levels need to be checked with a TDLAS instrument. It is relevant to workflows involving gas sampling, analytical testing, and monitoring of moisture concentration in gas streams. ASTM D7904 may be used by laboratories, field measurement teams, and operators who need a reliable method for evaluating natural gas moisture with laser-based technology.
Why is ASTM D7904 important?
ASTM D7904 matters because moisture measurement in natural gas can influence product quality, handling decisions, and compliance checks. A standardized test method helps reduce variation between instruments and testing practices, which supports more dependable results for procurement, verification, and routine monitoring. Using ASTM D7904 can also help organizations document moisture concentration in a consistent way when comparing performance or confirming gas specifications.
- TDLAS-based moisture measurement
- Natural gas water vapor determination
- Supports quality control and compliance checks
- Standardized test method for consistent results
- Publication Date: 2021-11-03
- Publisher: ASTM
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