BS 6644:2011 PDF

What is this standard about? It provides guidance on how to safely install and maintain gas-fired hot water boilers. Who is this standard for? Gas-fired hot water boiler manufacturers, installers, engineers and users. Why should you use this standard? It specifies requirements for the installation – including design, inspection, commissioning and maintenance – of gas-fired hot water boilers of net rated heat inputs exceeding 70 kW but not exceeding a net heat input of 1.8 MW. Groups of boilers with individual net heat inputs of 70 kW or less, but with aggregate net heat inputs in excess of 70 kW, are also covered. This standard applies to the installation of boilers that are designed to utilize normally distributed gases of Group H of the second family (e.g. natural gas), and gases of Group P (e.g. propane) and Group B (e.g. butane) of the third family. For the purposes of this installation standard, LPG/air mixtures are regarded as third family gases. It applies to the installation of the following gas-fired hot water boilers: