DVGW G 492 2021-06 PDF

Full title and description

DVGW G 492:2021-06 — Gas‑Messanlagen für einen Betriebsdruck bis einschließlich 100 bar (English title: Gas Measuring Systems for an Operating Pressure up to and including 100 bar). This DVGW technical rule (Arbeitsblatt) specifies requirements for planning, design, manufacture, assembly, testing, commissioning, operation, maintenance, decommissioning and disposal of gas measuring systems with an operating pressure up to and including 100 bar, and addresses modern aspects such as hydrogen‑enriched gas and updated safety and electrotechnical requirements.

Abstract

This Technical Rule provides functional and technical requirements for stationary and mobile gas measuring systems used in transmission and distribution networks, and at industrial or commercial delivery points, for the accurate determination of gas quantity and quality. It covers system design, instrument selection (flow and calorific value measurement), environmental and site conditions, electrical and safety provisions, inspection and acceptance testing, calibration and documentation requirements, and considerations for hydrogen blending. The rule aligns national requirements with recent European standards and regulatory updates.

General information

• Status: Current / Active (technical rule in force).
• Publication date: 2021-06 (June 2021).
• Publisher: DVGW (Deutscher Verein des Gas- und Wasserfaches e. V.), published/distributed via Wirtschafts‑ und Verlagsgesellschaft Gas und Wasser (WVGW).
• ICS / categories: ICS 75.180.30 (volumetric equipment and measurements — gas measuring systems).
• Edition / version: 2nd edition (2021) — DVGW G 492:2021-06, revision of the prior edition (supersedes the 2004 version).
• Number of pages: 29 pages (German edition; English translation/PDF editions may vary 29–30 pages).

Scope

The standard applies to gas measuring systems with an operating pressure up to and including 100 bar used in gas transportation and distribution networks and in stations supplying commercial, industrial or comparable facilities. It addresses the entire lifecycle of such systems — from planning and design through manufacture, installation, testing and commissioning to operation, maintenance, decommissioning and disposal — including requirements for measurement accuracy, instrument selection, environmental and meteorological conditions, safety (including electrical safety), and applicability to hydrogen‑enriched gases.

Key topics and requirements

• System lifecycle requirements: planning, documentation, commissioning, operation, maintenance and decommissioning.
• Flow measurement: selection, installation and accuracy requirements for flowmeters and associated instrumentation.
• Calorific value / gas quality measurement: requirements for analysis systems and energy determination.
• Meteorological and environmental considerations influencing measurement performance and site layout.
• Safety and electrotechnical rules: protective measures, electrical installations and functional safety aspects.
• Hydrogen blending: provisions and checks for hydrogen‑enriched natural gas mixtures where applicable.
• Testing, acceptance and calibration: factory and on‑site testing, acceptance certificates, calibration and traceability.
• Documentation and records: required files, test reports, maintenance records and demonstration of compliance.

Typical use and users

This rule is used by gas network operators, meter station designers and builders, manufacturers of meter skids and instrumentation, commissioning and test laboratories, regulatory and inspection bodies, and engineering consultants responsible for specifying, installing and operating gas measuring systems in transmission, distribution and industrial supply installations. It is referenced in procurement, acceptance testing, and conformity assessments.

Related standards

DVGW G 492 is part of the DVGW set of rules and is coordinated with related DVGW documents such as G 491 (safety‑related requirements for certain applications) and other G‑series technical rules; it also aligns with European standards for gas measuring systems (e.g., the EN/CEN gas‑measuring work program such as EN/ prEN 1776 functional requirements work). The 2021 revision updates and harmonises national requirements with recent European standards and regulatory changes.

Keywords

Gas measuring systems; metering stations; flow measurement; calorific value; gas quality; hydrogen blending; commissioning; calibration; acceptance testing; DVGW G 492; gas infrastructure; metering accuracy; operational requirements.

FAQ

Q: What is this standard?

A: DVGW G 492:2021-06 is a DVGW technical rule (Arbeitsblatt) that specifies requirements for gas measuring systems with an operating pressure up to and including 100 bar, covering their complete lifecycle from planning to disposal.

Q: What does it cover?

A: It covers system design and construction, instrument selection (flow and calorific measurement), site and environmental conditions, safety and electrical requirements, testing and acceptance procedures, calibration and documentation, and provisions for hydrogen‑enriched gas where applicable.

Q: Who typically uses it?

A: Gas network operators, station designers, equipment manufacturers, commissioning and testing laboratories, engineering consultants, and regulatory/inspection organisations involved with metering and measurement of gas.

Q: Is it current or superseded?

A: The 2021‑06 edition is the current DVGW technical rule (status: current/active) and supersedes the previous edition (the 2004 version).

Q: Is it part of a series?

A: Yes — it is part of the DVGW Set of Rules (G‑series) covering gas supply and infrastructure; it is coordinated with related DVGW rules such as G 491 and other G‑series technical standards and is linked to relevant European standards for gas measuring systems.

Q: What are the key keywords?

A: Gas measuring systems, metering, flowmeter, calorific value, gas analysis, hydrogen blending, commissioning, calibration, acceptance testing, DVGW G 492.