(b) depending on the type of pressure equipment, further information necessary for safe installation, operation or use and, where applicable, maintenance and periodic inspection such as: . the volume V of the pressure equipment in L, . the nominal size for piping DN, . the test pressure PT applied in bar and date, . safety device set pressure in bar, — output of the pressure equipment in kW, . supply voltage in V (volts), . intended use, . filling ratio kg/L, . maximum filling mass in kg, . tare mass in kg,— the product group;