This European Standard contains the relevant functional requirements for gas pressure regulating installa-
tions forming a part of the service lines in gas supply systems. It is applicable to the design, materials,
construction, testing, operation and maintenance of gas pressure regulating installations which form a part of
the service line for the supply of residential, high rise, public access, commercial and mixed use buildings
(see EN 1775) and for which the maximum upstream operatin~l pressure is equal to or less than 16 bar and
the design flow rate is equal to or less than 200 m3/h (normal m Ih).
This European Standard does not apply to gas pressure regulating installations commissioned prior to the
publication of this standard.
Basic system requirements for gas pressure regulating installations are contained in this European Standard.
Requirements for individual components (valves, regulators, safety devices, pipes, etc.) or installation of the
components are contained in the appropriate European Standards.
For gas pressure regulating installations forming a part of service lines with design flow rates of more than
200 m3/h (normal m~/h) or for a maximum upstream operating pressure of more than 16 bar prEN 12186
applies.
The requirements of this European Standard are based on good gas engineering practice under conditions
normally encountered in the gas industry. Requirements for unusual conditions cannot be specifically
provided for, nor are all engineering and construction details prescribed.
The requirements of this European Standard are based on the physical and chemical data of gaseous fuels in
accordance with table 1 of EN 437:1993 for first and second family gases. For gaseous fuels heavier than air
additional considerations may be necessary.
The objective of this European Standard is to ensure the safe operation of such systems. This does not,
however, relieve all concerned of the responsibility for taking the necessary care and applying effective
quality management during the design, construction and operation.
This European Standard specifies common basic principles for gas supply systems. Users of this European
Standard should be aware that more detailed national standards and/or codes of practice can 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 principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the
requirements of this standard, the national legislation/regulation shall take precedence.
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