Gastight 3 : The condition of a gas installation or gas pipework in which any leakage of gas is at a sufficiently low rate that no hazard is likely to ensue
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}