IGEM/UP/1B Edition 3 +A: 2012 - Tightness testing and direct purging of small Liquefied Petroleum Gas/Air, NG and LPG installations

This standard covers tightness testing and direct purging of pipework containing either LPG/Air, natural gas or LPG and applies to any section of pipework, including meters, having the following:

  • MOP at the outlet of the emergency control valve not exceeding 2 bar for NG and LPG/Air and
  • A nominal bore of not greater than 35 mm and
  • A maximum badged capacity through the primary meter of not exceeding 16 m3 h-1 and
  • A maximum installation volume supplying an individual dwelling or non domestic premises of 0.035 m3 and
  • LPG/Air Installations – OP at the outlet of the primary meter and any point in the section to be tested not exceeding 21 mbar or
  • NG Installations – OP at the outlet of the primary meter and any point in the section to be tested not exceeding 21 mbar or
  • LPG Installations – OP at the outlet of the final stage regulator and any point in the section to be tested not exceeding 37 mbar.

They apply to tightness testing in the following circumstances:

  • New pipework
  • Alteration to, replacement of, reuse of, or upgrading existing pipework
  • New extensions to existing pipework
  • Prior to any work on existing pipework
  • Where there is a known or suspected gas leak in the pipework
  • Where there has been a complete loss of pressure for any reason
  • Routine testing of existing pipework
  • Immediately before purging pipework (except when taking pipework permanently out of service).

And to direct purging in the following circumstances:

  • New pipework
  • Alteration to, replacement of or reuse of, existing pipework
  • New extensions to existing pipework
  • Where there has been a complete loss of pressure for any reason
  • Where there is the possibility of air being present in the pipework
  • Where pipework is to be taken out of service temporarily or permanently.

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