The stress test is part of the TRGI measurements. It is made during the building shell phase. The gas pipes material strength and the stability of the connections are checked before plastering or coverage. A 1000 hPa test pressure is applied to the new installed pipes -without fittings and gas devices. Hereby air or an inert gas is used as test medium. Within 10 minutes the pressure should not drop. The instrument must have a resolution of at least 0.1 bar. The ecom pressure meters overview shows which instrument fits which application.