SIST EN 12279:2000/A1:2005

• Status: Published
• Publication Date: 30-Nov-2005
• ICS: 23.060.40 - Pressure regulators
• ICS: 91.140.40 - Gas supply systems
• Technical Committee: DPL - Gas supply
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2005
• Due Date: 01-Dec-2005
• Completion Date: 01-Dec-2005
• Mandate: M/017 - Standardization mandate to CEN in the field of equipment and installation for the transmission and distribution of gas
• Ref Project: EN 12279:2000/A1:2005 - Gas supply systems - Gas pressure regulating installations on service lines - Functional requirements

• Referred By: SIST EN 15001-1:2023 - Gas Infrastructure - Gas installation pipework with an operating pressure greater than 0,5 bar for industrial installations and greater than 5 bar for industrial and non-industrial installations - Part 1: Detailed functional requirements for design, materials, construction, inspection and testing
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 334:2019 - Gas pressure regulators for inlet pressure up to 10 MPa (100 bar)
• Effective Date: 28-Jan-2026
• Referred By: SIST-TP CEN/TR 13737-2:2015 - Gas infrastructure - Implementation Guide for Functional Standards prepared by CEN/TC 234 - Part 2: National Pages related to CEN/TC 234 standards
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 334:2019+A1:2025 - Gas pressure regulators for inlet pressure up to 10 MPa (100 bar)
• Effective Date: 28-Jan-2026
• Amends: SIST EN 12279:2000 - Gas supply systems - Gas pressure regulating installations on service lines - Functional requirements
• Effective Date: 01-Dec-2005

SIST EN 12279:2000/A1:2005 is the Slovenian adoption of EN 12279:2000/A1:2005 from CEN. It concerns gas supply systems and gives functional maintenance requirements for gas pressure regulating installations on service lines. The amendment is aimed at manufacturers, operators, and maintenance staff who need to plan, carry out, and record safe maintenance work.

What does SIST EN 12279:2000/A1:2005 specify?

SIST EN 12279:2000/A1:2005 is an amendment to EN 12279:2000. It replaces Clause 12 and adds maintenance guidance for gas pressure regulating installations on service lines.

The text shown is organized around the foreword and Clause 12, Maintenance. Clause 12 is the part that sets out how maintenance should be planned, performed, recorded, and checked for safety.

What are the key requirements of SIST EN 12279:2000/A1:2005?

SIST EN 12279:2000/A1:2005 focuses on maintenance strategy, condition checks, safety controls, and record keeping. Clause 12 is written as functional guidance, so in practice it tells the user what a maintenance system should achieve rather than prescribing one single method.

• Clause 12 requires a structured decision-making process to identify the optimum maintenance requirements. In practice, maintenance should be planned on a documented basis, not by habit alone.

• Clause 12 says the best maintenance approach depends on operating conditions and duty. That means the maintenance plan should match how the installation is used, how heavily it is loaded, and the environment in which it operates.

• Clause 12 allows several maintenance philosophies: condition based maintenance, maintenance at regular intervals, and breakdown maintenance. It also says more advanced strategies may use mathematical models based on failure modes and effects analysis and reliability data. In practice, the standard leaves room for a simple schedule or a more analytical plan, depending on the installation.

• Clause 12 requires all components of the gas pressure regulating station to be maintained so they remain reliable, mechanically sound, leak-free, correctly set to pressure, and protected against dirt, liquids, freezing, and other effects that could impair function. This is the core maintenance outcome the operator has to verify.

• Clause 12 requires maintenance activities and irregularities to be recorded. It defines an irregularity as any malfunction of the system, including events such as unintentional tripping or failure of the pressure control system. In practice, service records need to capture faults as well as routine work.

• Clause 12 requires corrective action when there are grounds to suspect that pressure may be too high or too low. It also requires a careful check for explosive or flammable gas atmospheres where maintenance work may create ignition sources, and firefighting equipment where there is a risk of gas escaping. This makes safety controls part of the maintenance task, not a separate afterthought.

What terms does SIST EN 12279:2000/A1:2005 define?

SIST EN 12279:2000/A1:2005 uses a small set of maintenance terms that matter for reading Clause 12 correctly.

• Maintenance - the planned work and checks carried out to keep the gas pressure regulating installation fit for service.

• Condition based maintenance - maintenance that is driven by the actual condition of the equipment.

• Maintenance at regular intervals - servicing carried out on a set time or usage schedule.

• Breakdown maintenance - maintenance performed after a failure or malfunction has occurred.

• Failure modes and effects analysis - a method for studying how parts can fail and what those failures do to the installation.

• Irregularity - any malfunction of the system.

• Duty - the service role or workload of the installation that influences maintenance planning.

Who uses SIST EN 12279:2000/A1:2005?

SIST EN 12279:2000/A1:2005 is used by manufacturers of gas pressure regulating installations, gas supply operators, and maintenance planners or technicians working on service lines. It is also relevant to people preparing operating manuals, because the foreword says the amendment gives guidance on maintenance aspects to be considered in those manuals. In practice, it helps teams decide how to maintain equipment, what to record, and what safety checks to perform during service work.

What changed in SIST EN 12279:2000/A1:2005 from the previous edition?

SIST EN 12279:2000/A1:2005 replaces Clause 12 of EN 12279:2000. The amendment adds guidance on maintenance matters for manufacturers to consider in operating manuals, with the stated aim of supporting PED requirements.

Which standards are used with SIST EN 12279:2000/A1:2005?

SIST EN 12279:2000/A1:2005 is built on EN 12279:2000, which is the base European Standard whose Clause 12 is replaced by this amendment. The amendment is meant to be read together with that standard.

What does the SIST EN 12279:2000/A1:2005 document contain?

SIST EN 12279:2000/A1:2005 contains a foreword and Clause 12, Maintenance. Clause 12 sets out maintenance strategies, the need for a structured decision process, the equipment condition checks to perform, and the records to keep. It also covers responses to suspected pressure faults, checks for hazardous atmospheres, and availability of firefighting equipment during work where gas escape is possible.

SLOVENSKI STANDARD
01-december-2005
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)XQNFLRQDOQH]DKWHYH
Gas supply systems - Gas pressure regulating installations on service lines - Functional
requirements
Gasversorgungssysteme - Gas-Druckregeleinrichtungen in Anschlussleitungen -
Funktionale Anforderungen
Systemes d'alimentation en gaz - Installations de détente-régulation de la pression de
gaz faisant partie des branchements - Prescriptions fonctionnelles
Ta slovenski standard je istoveten z: EN 12279:2000/A1:2005
ICS:
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 12279:2000/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2005
ICS 23.060.40; 91.140.40
English Version
Gas supply systems - Gas pressure regulating installations on
service lines - Functional requirements
Système d'alimentation en gaz - Installations de détente- Gasversorgungssysteme - Gas-Druckregeleinrichtungen in
régulation de pression de gaz faisant partie des Anschlussleitungen - Funktionale Anforderungen
branchements - Prescriptions fonctionnelles
This amendment A1 modifies the European Standard EN 12279:2000; it was approved by CEN on 7 July 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references concerning such
national standards may be obtained on application to the Central Secretariat or to any CEN member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the
responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
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© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12279:2000/A1:2005: E
worldwide for CEN national Members.

Foreword
This European Standard (EN 12279:2000/A1:2005) has been prepared by Technical Committee CEN/TC 234
“Gas supply”, the secretariat of which is held by DIN.
This Amendm
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