BS EN 14222:2021 pdf free
BS EN 14222:2021 pdf free.Stainless steel steam boilers.
9.1.1 The requirements for electrically heated stainless steel steam boilers are given in EN 60204-1:2018. The requirements regarding shell boilers are derived from EN 12953-1:2012, EN 12953-5:2020, EN 12953-6:2011, EN 12953-8:2001 and EN 12953-9:2007 and modified by the following clauses.
9.1.2 Materials in contact with steam shall:
a) resist attack from steam and condensate;
b) not cause deterioration of the quality of the steam;
c) not release any substances known to be toxic in such quantities that could create a health or environmental hazard.
NOTE For further requirements on material, see EN 285:2015,4.2.
9.2 Safeguards against excessive pressure
Each steam boiler shall be equipped with safeguards against excessive pressure in accordance with EN 12953-8:200 1. In a deviation from EN 12953-8:200 1 the minimum inside diameter of the safety valve seat may be reduced to 8 mm.
9.3 Materials for valves, fittings, flanges and bolting
Steel materials for valves, fittings, flanges and bolting shall be in accordance with EN 13445-2:2014.
9.4 Limiting devices and safety circuits
9.4.1 Limiters shall be designed in accordance with EN 12953-9:2007. In addition to the requirements of EN 12953-9:2007, 5.4.2, level electrode inclinations between 450 and 900 from the vertical shall be allowed provided that functional capability and equivalent safety level examinations have proven successful.
The electrical safety circuits shall be in accordance with EN 60204-1:2018. If the steam boiler is a part of a sterilizer complying with EN 285:2015 or EN 13060:2014+A1:2018, electrical safety circuits may be analogous to the sterilizer in accordance to EN 61010-1:2010 and EN 61010-2-040:2015.
9.4.2 Software used for limiting devices, the boiler heat supply system and any further safety function and component shall be developed, verified and validated according to the respective requirements given by EN 285:2015 and EN 13060:2014+A1:2018, respectively (see EN 285:2015, 7.3 and EN 13060:2014+A1:2018, 4.5.4). Respective requirements from EN 12953-6:2011 or EN 12953-9:2007 may be applied alternatively.
9.4.3 Based on a hazard analysis, for limiting devices, the boiler heat supply system and any further safety function and component appropriate safety performance levels shall be established according to EN 62061:2005 and/or EN ISO 13849-1:2015 and EN ISO 13849-2:2012 (see EN 60204-1:2018, 9.4.1).BS EN 14222 pdf free download.
