ASTM D2029-97 (2017) PDF
Name in English:
St ASTM D2029-97 (2017)
Name in Russian:
Ст ASTM D2029-97 (2017)
Original standard ASTM D2029-97 (2017) in PDF full version. Additional info + preview on request
Full title and description
ASTM D2029-97(2017) — Standard Test Methods for Water Vapor Content of Electrical Insulating Gases by Measurement of Dew Point. This standard specifies procedures for determining the water vapor content of electrical insulating gases by direct or indirect measurement of dew point and for calculating moisture content from the measured dew point.
Abstract
ASTM D2029 describes four accepted test methods for measuring dew point in electrical insulating gases (such as SF6, nitrogen and other insulating gas mixtures) and converting that dew point to a water-vapor (moisture) content. Methods range from chilled-mirror techniques (automatic and manual), to adiabatic expansion and capacitance sensors, covering dew points from very low (down to about −110 °C for capacitance methods) to moderate ranges. The standard also highlights conversion, pressure-correction considerations and safety precautions applicable to gas handling and instrument use.
General information
- Status: Reapproved (2017) — active reapproval of the D2029-97 designation.
- Publication date: Original designation 1997; reapproved 2017 (published/reissued in 2017).
- Publisher: ASTM International.
- ICS / categories: 29.040.20 (Insulating gases, electrical insulating materials).
- Edition / version: D2029-97 (Reapproved 2017) — often shown as ASTM D2029-97(2017).
- Number of pages: 6 pages.
Scope
These test methods describe the determination of the water vapor content of electrical insulating gases by direct or indirect measurement of dew point and the calculation of water vapor content. The standard provides four methods (A–D) to measure dew point across different ranges and instrument types and guides conversion of dew point values to moisture content and operating considerations including pressure effects and safety precautions.
Key topics and requirements
- Four test methods provided:
- Method A — Automatic chilled-mirror measurement (dew points down to about −73 °C / −99 °F).
- Method B — Manual chilled-mirror or dew-cup method (dew points down to about −73 °C / −99 °F).
- Method C — Adiabatic expansion method (dew points down to about −62 °C / −80 °F).
- Method D — Capacitance (electronic) hygrometer method (dew points down to about −110 °C / −166 °F).
- Conversion of measured dew point to moisture content (volume percent or ppm) using provided tables and equations; attention to the effect of gas pressure on dew point and instrument readings.
- Instrument selection guidance and limits for each method (suitability, sensitivity and applicable dew-point ranges).
- Procedural requirements for sampling, calibration checks and calculation steps to report water content.
- Safety and handling notes for insulating gases and pressurized systems; references to specific precautionary clauses in the standard.
Typical use and users
Used by test laboratories, utilities, equipment manufacturers (gas-insulated switchgear, circuit-breakers), maintenance personnel, instrument manufacturers and quality/acceptance engineers. Typical applications include routine monitoring of SF6 and other insulating gases, acceptance testing, diagnostic moisture checks during installation and commissioning, and verification of gas-handling and drying operations.
Related standards
Standards commonly referenced alongside D2029 include ASTM specifications and test methods that mention gas moisture limits or insulating-gas properties, for example ASTM D1933 (nitrogen as electrical insulating material), ASTM D2472 (sulfur hexafluoride), and ASTM D3283 (air as an electrical insulating material). D2029 is also used in conjunction with manufacturer specifications and other hygrometry test methods when selecting measurement technique and acceptance criteria.
Keywords
dew point, water vapor, moisture content, electrical insulating gas, SF6, chilled mirror, dew cup, adiabatic expansion, capacitance hygrometer, hygrometer, gas sampling, dew/frost point
FAQ
Q: What is this standard?
A: ASTM D2029-97(2017) is a set of standardized test methods for determining the water vapor content of electrical insulating gases by measuring dew point and converting to moisture content.
Q: What does it cover?
A: It covers four measurement methods (automatic chilled mirror, manual chilled mirror/dew-cup, adiabatic expansion, and capacitance sensors), their applicable dew-point ranges, sampling and calculation procedures, pressure-correction considerations, and basic safety guidance for handling insulating gases.
Q: Who typically uses it?
A: Utilities, gas-insulated equipment manufacturers, maintenance and commissioning teams, independent test laboratories, and instrument manufacturers use it for moisture measurement, acceptance testing and ongoing monitoring of insulating gases.
Q: Is it current or superseded?
A: The D2029 designation was originally issued in 1997 and was reapproved in 2017 (commonly cited as ASTM D2029-97(2017)). As of its 2017 reapproval it remained the active reapproved version. Users should consult ASTM International for any reissues or later revisions beyond the 2017 reapproval to confirm current status before formal use.
Q: Is it part of a series?
A: D2029 is part of the ASTM D27 committee’s body of test methods and specifications related to electrical insulating liquids and gases. It is frequently used alongside related ASTM specifications that set gas quality limits (for example D1933, D2472, D3283).
Q: What are the key keywords?
A: Dew point, water vapor, moisture content, insulating gas, chilled mirror, capacitance hygrometer, adiabatic expansion, SF6, dew cup, hygrometer.