Non-destructive testing of steel tubes - Part 11 : automated ultrasonic
testing of weld seam of welded steel tubes for the detection of
longitudinal and/or transverse imperfections - Amendment 1 : change of
ultrasonic test frequency; change of acceptance criteria
Gas-fired domestic appliances producing hot water -Part 4: Assessment of
energy consumption of gas combined heat and power appliances (mCHP)
producing hot water and electricity