BAS EN 12953-1:2006

1.1 General This European Standard specifies design, construction, equipment, operational and water treatment requirements drawn up with a view to ensuring the operating safety of new stationary shell boiler plants. This European Standard includes the requirements for the prevention of over-heating and inadmissible over- pressurisation. 1.2 Boiler plants A boiler plant consists of: a) the shell boiler including all pressure parts from the feedwater inlet (including the inlet valve) to the steam and/or hot-water outlet (including the outlet valve). This includes economisers, superheaters and associated connecting pipes which are heated by flue gas and are not separated from the main system by intervening shut-off devices. Also included is any piping connecting the boiler to and including the first isolating valve; b) isolated economisers, superheaters and associated connecting pipes; c) expansion vessels and/or expansion tanks for plants for hot water production; d) thermal insulation and/or refractory and cladding; e) installations for heat supply and heating; f) installations for processing and feeding the fuel into the boiler; g) installations for the air supply of the boiler including the fans; h) installations for the feedwater supply of the boiler; i) all control and safety systems. This European Standard specifies requirements for both directly fired and electrically heated boilers including low pressure boilers (LPB, see 3.7) as well as for waste-heat boilers with a gas-side pressure not exceeding 0,5 bar1) of cylindrical design, constructed from carbon or carbon manganese steels by fusion welding and a design pressure not exceeding 40 bar1). The boilers covered by this European Standard are intended for land use for providing steam or hot water (typical examples are shown in Figures 1.2-1 to 1.2-5).