BS EN 1775:2007

Foreword
1 Scope
2 Normative references
3 Terms and definitions
  3.1 Definitions relating to pressures
  3.2 Definitions relating to the gas installation
  3.3 Definitions relating to means of isolation
  3.4 Definitions relating to jointing methods
  3.5 Definitions relating to fittings
  3.6 Definitions relating to tests
  3.7 Definitions relating to commissioning, operation and
      maintenance
  3.8 Definitions relating to assembling processes
      3.8.1 Definitions for welding
      3.8.2 Definitions for soldering and brazing
4 Design
  4.1 General
  4.2 Selection of components
  4.3 Location
  4.4 Protection in case of fire
  4.5 Sizing
  4.6 Safety devices
5 Construction
  5.1 Installation
  5.2 Pipework jointing methods
      5.2.1 Threaded joints
      5.2.2 Welded, brazed, soldered and fusion joints
      5.2.3 Mechanical joints
      5.2.4 Pressed joints
      5.2.5 Stainless steel pliable corrugated tubing system
            jointing
  5.3 Entries through walls and floors
  5.4 Corrosion
  5.5 Means of isolation
  5.6 Regulators and meters
  5.7 Flexible appliance connectors
6 Testing
  6.1 General recommendations
  6.2 Recommendations relating to the safety of persons and property
      during testing
  6.3 Test fluids
      6.3.1 Fluids used
      6.3.2 Use of inert gas
      6.3.3 Utilisation of the gas to be distributed
  6.4 Test conditions
  6.5 Strength testing
  6.6 Tightness testing
  6.7 Additional tests
7 Commissioning
  7.1 General
  7.2 Admission of gas
8 Operation and maintenance
  8.1 General
  8.2 Maintenance
  8.3 Abnormal situations
  8.4 Leak detection
  8.5 Work on operating pipework
  8.6 Purging from gas
Annex A (informative) Resistance to high temperatures
 A.1 General
 A.2 Procedure A
     A.2.1 Test criteria
     A.2.2 Test method
 A.3 Procedure B
     A.3.1 Test criteria
     A.3.2 Test method
Annex B (informative) General guidelines for the construction of
        joints
 B.1 General
 B.2 Installation operatives
 B.3 Quality Control
 B.4 Documentation
Annex C (informative) Guidelines for the construction of welded,
        brazed, soldered joints, and polyethylene fusion joints
 C.1 Welding of steel
     C.1.1 Materials
     C.1.2 Approval of the welding procedure
     C.1.3 Pipework with a maximum operating pressure (MOP) up to
           and including 0,1 bar and a wall thickness less than 4 mm
     C.1.4 Pipework with a maximum operating pressure (MOP) over
           0,1 bar or wall thickness including and above 4 mm
 C.2 Brazing and soldering of copper and copper alloys
     C.2.1 Materials
     C.2.2 Brazing and soldering procedure
     C.2.3 Pipework with a maximum operating pressure (MOP) up to
           and including 0,1 bar
     C.2.4 Pipework with a maximum operating pressure (MOP) over
           0,1 bar
 C.3 Fusion jointing of polyethylene
     C.3.1 Materials
     C.3.2 Polyethylene fusion jointing procedure
     C.3.3 Qualification of personnel
     C.3.4 Quality control
Annex D (informative) Guidelines for the construction of pressed
        joints
 D.1 Jointing procedure with press fittings on copper pipes
     D.1.1 General
     D.1.2 Installation process
 D.2 Jointing procedure with press fittings on multi-layer and PEX
     D.2.1 General
     D.2.2 Installation process
Annex E (informative) Guidelines for the construction of stainless
        steel pliable corrugated tubing systems
 E.1 General
 E.2 Components of the system
 E.3 Stainless steel pliable corrugated tubing systems jointing
     procedure
     E.3.1 General
     E.3.2 Training of personnel
     E.3.3 Quality control
Bibliography

Describes general recommendations for the design, construction, testing, commissioning, operation and maintenance of installation pipework; pipework between the delivery point of the gas and the inlet connection to the gas appliance.

1.1 This standard specifies general recommendations for the design, construction, testing, commissioning, operation and maintenance of installation pipework; pipework between the delivery point of the gas and the inlet connection to the gas appliance.

This standard specifies common basic principles for gas installation pipework.

Users of this European standard need to be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries.

This 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 standard, national legislation/regulation takes precedence as illustrated in CEN /TR 13737.

NOTE 1 CEN/TR 13737 contains:

• clarification of relevant legislation/regulations applicable in a country;

• if appropriate, more restrictive national requirements;

• national contact point for the latest information.

This standard applies to:

• gas installations in residential, commercial and public access building having a maximum operating pressure (MOP) less than or equal to 5 bar;

• industrial gas installations having a maximum operating pressure (MOP) less than or equal to 0,5 bar.

NOTE 2 For industrial gas installations having a MOP above 0,5 bar, or installations having a MOP above 5 bar, see prEN 15001-1.

This standard is applicable to new installation pipework as well as to replacements of, or extensions to, existing installation pipework.

This standard does not contain detailed recommendations relating to the laying of buried pipework.

NOTE 3 For more information on buried pipework, see EN 12007-1, EN 12007-2 and EN 12007-3.

NOTE 4 For more information on gas pressure regulating installations, see EN 12279.

NOTE 5 For more information on gas metering systems, see EN 1776.

1.2 This standard is applicable to installation pipework supplied from gas distribution systems and from liquefied petroleum gases (LPG) storage vessels.

Excluded are:

• single appliance LPG installations without fixed pipework, achieved by a flexible appliance connector from an adjacent LPG storage cylinder.

• LPG storage vessels.

1.3 In this standard the term \'gas\' refers to combustible gases, which are gaseous at 15 °C and 1 013,25 mbar. These gases, odorized for safety reasons, are commonly referred to as manufactured gas, natural gas or liquefied petroleum gases (LPG). They are also referred to as first, second or third family gases (see EN 437).

In this standard, all pressures are gauge pressures, unless otherwise stated.