Working Pressure 2 : In relation to gas cylinders, a non-preferred term whose definition may vary with each example. Unless otherwise defined, to be taken as the filling pressure for permanent gases
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}