UL Listed Industrial Control Panel. UL File Number E474341. All piping cleaned to CGA Standard G-4.1. All brazing / welding performed by competent technicians qualified to Section IX, Welding and Brazing Qualifications, of the ASME Boiler and Pressure Vessel Code. All piping used complies with ASTM B 819. Assembled, Installed, and tested in accordance with Chapter 13 of the International Plumbing Code and NFPA 99. Pressure tested and leak checked pneumatically, with Clean, Oil Free, Dry Nitrogen, to 110% MAWP. Also tested with Liquid Nitrogen to 100% MAWP.