ISO 20676:2018 PDF

Name: ISO 20676:2018 — Natural gas — Upstream area — Determination of hydrogen sulfide content by laser absorption spectroscopy
SKU: ISO 20676:2018
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Natural gas — Upstream area — Determination of hydrogen sulfide content by laser absorption spectroscopy

Название (английский):

ISO 20676:2018

Natural gas — Upstream area — Determination of hydrogen sulfide content by laser absorption spectroscopy

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 16
Дата публикации:: 16 октября 2018 г.
Издание:: ISO IS 20676 edition 1 version 1
ICS:: 75.060

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Описание (английский):

This document specifies a method for the determination of hydrogen sulfide content in working field natural gas of upstream area by laser absorption spectroscopy. The analytical range expressed as mole fraction is 10 × 10−6 to 20 %. The analytical range can be expanded to higher content with specific instrument requirements.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 20676:2018 specifies a method to determine hydrogen sulfide (H2S) content in upstream-area natural gas using laser absorption spectroscopy. The standard covers instrument selection, calibration, sampling, measurement procedure and uncertainty evaluation. The analytical range is 10 × 10−6 to 20 % (mole fraction) and can be expanded with specific instrument requirements. ISO 20676:2018 is intended for working-field natural gas analysis in upstream operations.

Key topics and technical requirements

Measurement principle: Semiconductor laser beam transmitted through the sample; absorbance follows the Lambert–Beer law.

Analytical range: 10 × 10−6 to 20 % (mole fraction); expandable with instrument-specific capabilities.

Instrument requirements:

Signal/noise ratio greater than 2:1 across analytical range.
Light transmission > 10 % before sample introduction.
Laser generator warm-up: follow manufacturer instructions; if unspecified, 48 h before first use and 1 h after power-on.
Gas pressure at analyser inlet: 0.2 MPa to 0.4 MPa (use regulator with minimal internal volume, stainless steel or deactivated materials).

Calibration:

Use certified H2S calibration gas with methane as balance gas.
Methane purity > 999 mmol/mol, H2S impurity ≤ 0.1 μmol/mol.
Calibration frequency: user-defined but at least annually.
Accepted calibration methods (per ISO 11095): bracketing, response formula simulation (≥3 calibration gases), one-point (with ≤20 % relative difference requirement).

Sampling:

Follow ISO 10715 sampling guidelines.
Use materials inert to sulfur compounds; condition samples to remove liquid water, dust and liquid hydrocarbons.

Reagents and absorbers:

10 % (mass fraction) NaOH solution recommended for H2S absorption (other absorbing compounds allowed).

Quality and reporting:

Includes sections on repeatability and uncertainty evaluation to support data quality.

Safety: H2S is poisonous; implement appropriate health and safety measures.

Applications and users

ISO 20676:2018 is practical for:

Upstream oil & gas operators conducting wellhead and field gas testing

On-site and portable analyser manufacturers designing laser H2S analysers

Field technicians and lab analysts responsible for process control, safety monitoring, and regulatory compliance

Pipeline and custody-transfer personnel requiring reliable H2S quantification

Typical uses: continuous monitoring, spot-checks, process optimization, H2S mitigation, environmental and personnel safety controls.

Related standards

ISO 10715 - Natural gas - Sampling guidelines (normative reference)

ISO 11095 - Linear calibration using reference materials (normative reference)

Other sulfur analysis standards referenced in ISO introduction:

ISO 6326-3, ISO 6326-5, ISO 16960, ISO 19739, ISO 20729

Keywords: ISO 20676:2018, hydrogen sulfide, H2S, natural gas, upstream area, laser absorption spectroscopy, calibration, sampling, ISO 10715, ISO 11095.

ISO 20676:2018 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 11095:1996

Linear calibration using reference materials

SIST EN ISO 10715:2023

Natural gas - Gas sampling (ISO 10715:2022)

BS EN ISO 6326-3:1998

Natural gas. Determination of sulfur compounds - Determination of hydrogen sulfide, mercaptan sulfur, and car…

BS EN ISO 6326-5:1998

Natural gas. Determination of sulfur compounds - Lingener combustion method

SIST EN ISO 16960:2014

Natural gas - Determination of sulfur compounds - Determination of total sulfur by oxidative microcoulometry…

SIST EN ISO 19739:2006/AC:2009

Natural gas - Determination of sulfur compounds using gas chromatography (ISO 19739:2004/Cor 1:2009)

ISO 20729:2017

Natural gas — Determination of sulfur compounds — Determination of total sulfur content by ultraviolet fluore…