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