G 459-2 Technical Rule - Standard 11/2015

Gas Pressure Regulating Installations with a Maximum Upstream Operating Pressure of 5 bar and a Maximum Design Flow Rate of 200 m3/h under Normal Conditions on Service Lines; Functional Requirements ++ PDF file ++

62,03 €*
  • DVGW
  • 20 pages
  • available as PDF only
  • 2nd edition 2015
  • 1
  • 1
  • 510455
ST

62,03 €*

This Technical Rule G 459‑2 applies to the design, installation, testing, commissioning, operation and maintenance of gas pressure regulating systems within the scope of DVGW Standard G 459‑1 with inlet pressures up to 5 bar1 and a maximum nominal flow rate of 200 m3/h under normal conditions for the supply of residential and office buildings, council housing as well as mixed‑use buildings and buildings housing public, cultural and commercial facilities to the extent that these are comparable to buildings of residential use with gases whose properties meet the requirements of DVGW Standard G 260, with the exception of liquefied petroleum gas (LPG)2, and which are supplied by public gas utilities. This Standard does not cover industrial production plants.
Foreword

1 Scope

2 Normative references

2.1 DVGW Set of Rules

2.2 DIN Standards

2.3 Acts, Directives and Ordinances

3 Terms and definitions

3.1 Pressure and temperature terms

3.2 Gas pressure regulating system

3.3 Gas pressure regulator

3.4 Safety shut-off device

3.5 Function lines

3.6 Qualified person

3.7 Skilled person

3.8 Contracted installers

4 General requirements

5 Component requirements

5.1 Gas pipeline system

5.2 Protection against the effects of fire (indoor Installation)

5.3 Noise control measures

5.4 Indispensable components

5.4.1 Shut-off devices on the inlet side

5.4.2 Gas pressure regulators

5.4.3 Safety shut-off devices ? overpressure protection

5.4.4 Additional safety devices to prevent inadmissible pressure increases at MOPu above 1 bar

5.5 Additional components

5.5.1 Automatic safety shut-off devices ? underpressure

5.5.1.1 Low-pressure cut-off valve

5.5.1.2 Low-pressure cut-off of the safety shut-off device

5.5.2 Gas pressure regulators with flow monitor

5.5.3 Equipment for the removal of harmful substances

5.5.4 Shut-off devices on the outlet side

5.5.5 Function lines

5.5.5.1 General requirements

5.5.5.2 Venting lines for venting, pressure relief and bleeding

5.5.6 By-pass lines

6 Installation and arrangement of gas pressure regulating systems

6.1 Accessibility

6.2 Protection against damage

6.3 Ventilation

7 Approval procedures for contractors specialising in the installationand testing of gas pressure regulating systems

7.1 Contracted installers

7.2 Other companies

8 Testing

8.1 External tightness test

8.2 Function test

9 Commissioning

10 Testing and commissioning documentation

11 Operation and maintenance

Annex A (informative) ? Randomised spot checks during incoming goods inspection

Bibliography