GB/T 27896-2018Test method for water vapor content of natural gas—Electronic moisture analyzers (English PDF)
天然气中水含量的测定 电子分析法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 17, 2018
Implementation date
April 1, 2019
Scope
GB/T 27896-2018 is the English-translated version of 天然气中水含量的测定 电子分析法.
GB/T 27896-2018 specifies how to determine the water content of natural gas with an electronic moisture analyzer.
It defines four sensor types: capacitance sensors with an aluminium oxide film, electrolytic sensors with a phosphorus pentoxide coating, piezoelectric sensors based on a quartz crystal with a hygroscopic polymer coating, and laser sensors that measure how much near-infrared light water molecules absorb.
It then covers the equipment, including traceability requirements, the test steps and the repeatability of the measurement, and refers to GB/T 13609 for sampling and to GB/T 22634 for converting between water content and water dew point.
It applies to the determination of water content in natural gas, and users remain responsible for the related safety measures. It replaces GB/T 27896-2011, was issued on 17 September 2018 and has applied since 1 April 2019.
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Document preview — GB/T 27896-2018
National Standard of the People's Republic of China
- ICS
- 75.060
- Classification
- E 24
- Replacing
- GB/T 27896-2011
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 equipment
- 5 Test step
- 6 repeatability
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 27896-2011 "Electronic Analysis Method for Determination of Water Content in Natural Gas", and GB/T 27896-2011 The main technical content changes except for editorial changes are as follows.
--- In the scope of the original standard on the "electronic moisture analyzer" footnote into the standard text;
--- Removed JJG500 from the canonical reference file and added GB/T 22634 (see Chapter 2, Chapter 2 of the 2011 edition);
--- In Chapter 3, "Terms and Definitions," the description of the capacitive sensor was modified (see 3.1, 3.1 of the 2011 edition);
--- Added in Chapter 3, "Terminology and Definitions" for Laser Sensors. "Some instruments do not require a specular laser to emit. Light" (see 3.4, 3.4 of the 2011 edition);
--- Change "structure" to "material" (see 4.1.2, 2011 version 4.1.2);
--- Delete the original standard Chapter 5 "Calibration", add the traceability requirements in Chapter 4 "Equipment";
--- Added the requirement for measurement repeatability in Chapter 6.
1 Scope
This standard specifies the test method for determining the water content of natural gas using an electronic moisture analyzer.
This standard applies to the determination of water content in natural gas.
This standard does not address all security issues related to its application. Before using this standard, users are responsible for establishing appropriate safety and Protection measures and clarify the scope of their limitations.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 13609 Natural Gas Sampling Guidelines
GB/T 20604 natural gas vocabulary
GB/T 22634 conversion between natural gas water content and water dew point
3 Terms and definitions
The following terms and definitions as defined in GB/T 20604 apply to this document.
3.1 Capacitance sensor
Aluminum coated with an aluminum oxide (Al2O3) coating is part of the capacitor. Dielectric Al2O3 film changes electricity The capacitance of the container is associated with the presence of water vapor. The operation principle of the silicon component is the same, and its capacitance occurs with adsorption or analysis of water vapor. Variety.
3.2 Electrolytic sensor
It consists of two metal electrodes coated with a phosphorus pentoxide (P2O5) coating. The voltage applied between the electrodes causes the phosphorus pentoxide (P2O5) to be coated. The water absorbed by the layer undergoes an electrolytic reaction to generate a current between the electrodes, and the generated current is proportional to the concentration of the water vapor.
3.3 Piezoelectric sensor
It consists of a pair of electrodes supporting a quartz crystal (QCM) sensor. When the sensor is applied with a voltage, it produces a very stable vibration.
The surface of the sensor is coated with a hygroscopic polymer coating. The vibration frequency changes proportionally with the change in the moisture absorbed by the polymer.
3.4 Laser sensor
It is composed of a sample chamber, one end of which is mounted with an optical head and the other end is provided with a mirror surface. Optical head contains near infrared (NIR) laser The laser emits light of a known wavelength that can be absorbed by water molecules. A light sensitive detection of NIR wavelengths is installed next to the laser Device. The light emitted by the laser passes through the sample chamber and returns to the detector of the optical head at the end. Emit light through the sample chamber and return detection When the device is emitted, part of the emitted light is absorbed by the water molecules, and the absorbed light intensity is proportional to the water content.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 27896
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 27896-2018 | Test method for water vapor content of natural gas—Electronic moisture analyzers | current edition | Current |
| GB/T 27896-2011 | Test method for water vapor content of natural gas—Electronic moisture analyzers | previous edition | Superseded |
This page sells the current edition, GB/T 27896-2018. Earlier editions are listed for reference only.
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Related Standards
GB/T 13609-2025 — Natural gas - Gas sampling
GB/T 20604-2025 — Natural gas - Vocabulary
GB/T 22634-2008 — Conversion between water content and water dew point of natural gas
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