IGEM/UP/1B Edition 3 +A: 2012 - Tightness testing/direct purging of small Liquefied Petroleum Gas/Air, NG/ LPG installations - Digital (3 year)
IGEM/UP/1C - Strength testing, tightness testing and direct purging of Natural Gas and LPG meter installations - Digital (3 year)
IGE/UP/7 Edition 2 +A: 2008 - Gas installations in timber framed and light steel framed buildings - Hard copy