Tightness Check (TRGI)
The tightness check is part of those measurements prescribed by the TRGI. It targets to find out whether the tightness of the pipework with fittings but without gas devices is given or not. The pressure should keep constant by 150 hPa test pressure and this during 10 minutes at least (depending of plant volume). The pressure meter used should have a resolution of at least 0.1 hPa.