ISO 6327:1981 PDF

Name: ISO 6327:1981 — Gas analysis — Determination of the water dew point of natural gas — Cooled surface condensation hygrometers
SKU: ISO 6327:1981
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Gas analysis — Determination of the water dew point of natural gas — Cooled surface condensation hygrometers

Название (английский):

ISO 6327:1981

Gas analysis — Determination of the water dew point of natural gas — Cooled surface condensation hygrometers

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 марта 1981 г.
Издание:: ISO IS 6327 edition 1 version 1
ICS:: 75.060

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Описание (английский):

Describes hygrometers which determine the water content of a gas by detecting water vapour condensation occurring on a cooled surface or by checking the stability of the condensation on this surface. The hygrometers considered here may be used for determining water vapour pressure, without requiring calibration, in a system operating under total pressures greater than or equal to atmospheric pressure.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 6327:1981 is an international standard established by the International Organization for Standardization (ISO) that specifies the method for determining the water dew point of natural gas using cooled surface condensation hygrometers. This standard is essential for analyzing natural gas moisture content by detecting water vapor condensation on a cooled surface, generally a mirror. It applies to gas systems operating at pressures equal to or above atmospheric pressure, providing accurate water vapor pressure measurement without requiring prior calibration.

The standard addresses hygrometers designed to measure the dew point of natural gas by controlled cooling of a reflective surface until water condensation appears. This condensation temperature correlates directly to the partial pressure of water vapor in the gas sample, making this a reliable method for monitoring water content critical to natural gas quality and pipeline safety.

Key Topics

Principle of Operation The hygrometer works by cooling a metallic surface in contact with the natural gas sample until condensation forms. The temperature of this surface at the onset of condensation indicates the water dew point temperature, which reflects the water vapor pressure in the gas. This measurement is absolute and independent of calibration under proper conditions.

Measurement Range and Conditions Suitable for dew points between approximately -25°C and +5°C, which corresponds to typical water vapor concentrations in pipeline natural gas (50 to 200 ppm by volume). Systems operate under pressures at or above atmospheric pressure.

Instrument Design and Types Various designs exist based on cooling methods (e.g., evaporative cooling, adiabatic gas expansion, indirect refrigerant contact, thermoelectric Peltier coolers), condensation detection (manual visual observation or automatic photoelectric cells), and temperature measurement techniques. The hygrometer mirror should be easily detachable for cleaning.

Cooling Techniques

Evaporation of volatile solvents like ethylene oxide or acetone to cool the mirror.
Adiabatic expansion of gases such as compressed CO₂ or nitrogen to reduce mirror temperature.
Indirect cooling through a cold refrigerant attached via a thermal resistance element.
Thermoelectric Peltier elements for solid-state, controllable cooling in automated systems.

Measurement Accuracy and Sources of Error Influences include solid impurities on the mirror, condensable hydrocarbons, cold spots in sampling lines (leading to premature condensation), and contamination by substances such as methanol, which produce mixed dew points. The standard recommends short, well-insulated sampling lines and precautions to maintain sample integrity.

Condensate Management Efficient removal of condensate droplets, especially hydrocarbon condensates, is critical for accurate dew point measurement. Mirrors should be positioned to facilitate droplet flow off the surface to avoid measurement interference.

Applications

Natural Gas Quality Control Ensures compliance with moisture content specifications, preventing pipeline corrosion and hydrate formation.

Pipeline Monitoring and Safety Early detection of moisture levels helps avoid operational issues in transportation and distribution networks.

Gas Processing Plants Monitoring water dew points during treatment and drying processes to optimize operation efficiency.

Research and Development Used in laboratories and field testing for evaluating gas composition and moisture content under various conditions.

Related Standards

ISO 15882: Natural Gas - Determination of Water Content by Means of Spectroscopic Analysis

ISO 12185: Crude Petroleum and Petroleum Products - Determination of Density

ISO 10715: Natural Gas - Sampling Guidelines

International standards on gas moisture analysis and dew point determination to complement ISO 6327 methods.

Keywords: ISO 6327, water dew point, natural gas, condensation hygrometer, gas analysis, moisture determination, cooled surface condensation, gas dew point measurement, natural gas quality, dew point hygrometer, water vapor pressure.

ISO 6327:1981 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

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