BS EN 1776:2015 specifies functional requirements for the design, construction, testing, commissioning/decommissioning, operation, maintenance and, where appropriate, calibration, together with suitable documented provisions for all new gas measuring systems and any major changes of existing systems.

This European Standard also specifies accuracy classes of measuring systems and thresholds applicable to these classes. Demonstration of compliance is achieved through the selection, installation and operation of appropriate measurement instruments, together with suitable documented provisions for calculations. Examples of demonstration of compliance are provided for each accuracy class; however, they are not prescriptive solutions.

This European Standard is applicable for gases of the 2nd family as classified in EN 437. It is also applicable for treated non-conventional combustible gases complying with EN 437 and for which a detailed technical evaluation of the functional requirements (such as injected biomethane) is performed ensuring there are no other constituents or properties of the gases that can affect the metrological and physical integrity of the measuring systems.

This European Standard can also be used as a guideline for 1st and 3rd family gases as classified in EN 437; however additional considerations should be taken with regard to the different constituents and physical characteristics of the gas family.

This European Standard is not applicable for raw or sour gases.

This European Standard is not applicable for gas measurement in CNG filling station.

This European Standard gives guidelines when designing, installing and operating gas meters with additional functionalities (smart gas meters).

Communication protocols and interfaces for gas meters and remote reading of gas meters are outside the scope of this European Standard and are covered by the appropriate parts of EN 13757, which provide a number of protocols for meter communications. Supervisory control and data acquisition protocols (SCADA) are also not covered by this European Standard.

Unless otherwise specified all pressures used in this European Standard are gauge pressures.

For associated pressure regulating systems the requirements of EN 12186 and/or EN 12279 apply.

For requirements on design, housing, lay-out, materials for components, construction, ventilation, venting and overall safety of gas measuring systems within the scope of this European Standard, EN 15001, EN 12186, EN 12279 and/or EN 1775 apply additionally, where relevant.

This European Standard specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries.

This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above mentioned basic principles.

In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, national legislation/regulation takes precedence as illustrated in CEN/TR 13737-1 and CEN/TR 13737-2. CEN/TR 13737 (all parts) gives:

• clarification of all legislation/regulations applicable in a member state;
• if appropriate, more restrictive national requirements;
• a national contact point for the latest information.

Cross References:
EN 1359
EN 1594
EN 1775
EN 12186
EN 12261
EN 12279
EN 12327
EN 12405-1
EN 12405-2
EN 12405-3
EN 12480
EN 13463-1
EN 15001-1
EN 15001-2
EN 60079-10-1
IEC 60079-10-1
EN 60079-14
IEC 60079-14
EN 60079-17
IEC 60079-17
EN 61000
EN ISO 5167-1
ISO 5167-1
EN ISO 5167-2
ISO 5167-2
EN ISO 6141
ISO 6141
EN ISO 6142-1
ISO 6142-1
EN ISO 6143
ISO 6143
EN ISO 6975
ISO 6975
EN ISO 10715
ISO 10715
EN ISO 10723
ISO 10723
EN ISO 12213-1
ISO 12213-1
EN ISO 15970
ISO 15970
ISO 2186
ISO 10790
ISO 17089-1
EN 334
EN 437
EN 1127-1
EN 12007-1
EN 12007-2
EN 12007-3
EN 12007-4
EN 13757
EN 14236
EN 16314
EN 24006
ISO 4006:1991
EN 60079-29-1
IEC 60079-29-1
EN ISO 9000
ISO 9000
EN ISO 9001
ISO 9001
EN ISO 9004
ISO 9004
EN ISO 13443
ISO 13443
EN ISO 15112
ISO 15112
EN ISO 15796
ISO 15796
EN ISO/IEC 17025
ISO/IEC 17025
ISO 5168
EN ISO 6974
EN ISO 6976
ISO 6976
EN ISO 12213-2
ISO 12213-2
EN ISO 12213-3
ISO 12213-3
ISO 10012
ISO 15971
CEN/CLC/ETSI TR 50572
2004/22/EC
2004/108/EC
OIML R 140
OIML R 137-1 & 2
ISO/IEC Guide 98-1
ISO/IEC Guide 98-3
GUM:1995
ISO/IEC Guide 98-4
ISO/TR 9464
ISO 12764
JCGM 100
JCGM 101
JCGM 104
JCGM 105
JCGM 106
JCGM 107
ISO/IEC Guide 98-5


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