DS EN 1151-2:2006 Pumps - Rotodynamic Pumps - Circulation Pumps Having A Rated Power Input Not Exceeding 200 W For Heating Installations And Domestic Hot Water Installations - Part 2: Noise Test Code (Vibro-Acoustics) For Measuring Structure- And Fluid-Borne Noise Defines a test code for the vibro-acoustic characterisation of circulation pumps as defined in EN 1151-1, and is limited to circulation pumps with threaded connections of 1[1/2] inch.