BS EN 14222 pdf free download

BS EN 14222-2021 pdf free download.Stainless steel steam boil lers.
9 Requirements for equipment
9.1 General
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 ofthe quality ofthe 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 12953-8:2001. In a deviation from EN 12953-8:2001 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 13445-2:20 14.
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 45° and 90° 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. Ifthe 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).
Respective requirements from EN 12953-6:2011 or EN 12953-9:2007 may be applied alternatively.
9.4.4 Functional checking of all limiters shall be possible at any time during operation or by a separate test, e.g. by simulation, where appropriate.
9.4.5 If a limiter responds, the steam boiler shall automatically go to a safe condition and a signal shall be given to indicate steam boiler malfunction.
9.4.6 After manual resetting of a limiter lock-out, the steam boiler shall be put back into operation by manual intervention only.
9.5 Steam boiler heat supply
9.5.1 The operating pressure of each steam boiler shall be controlled automatically by regulating the heating energy input. If the steam boiler is a part of a sterilizer complying with EN 285:20 15 or EN 13060:2014+A1:2018, control of the steam boiler may be executed by the sterilizer’s control equipment as specified in EN 285:2015, Clause 7, or EN 13060:2014+A1:2018, 4.5.
9.5.2 Automatic start-up of the steam boiler and the system is permitted provided that equipment is installed to ensure that start-up is conducted safely. Automatic restarting after normal shut-down shall not be considered a start-up.
9.5.3 A high temperature alarm device for shutting off the heating energy supply shall be provided and adjusted accordingly. The alarm temperature shall be determined.
9.5.4 The electrical supply circuits and the safety of the control equipment shall conform to
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, the electrical supply circuits and the safety of the control equipment may be
analogous to the sterilizer in accordance with EN 61010-1:2010 and EN 61010-2-040:2015.
9.6 Water level indication
9.6.1 Each steam boiler shall have at least one independent means (independent from other equipment) of indicating the water level, which shall be a water level gauge of transparent material directly connected to the steam boiler.
9.6.2 The water level gauge(s) shall be mounted so that the water level is visible through the transparent material at the lowest alarm level, i.e. at the lowest permissible water level (LWL), which shall be marked. The specified maximum permissible water level shall also be visible. The water level gauge shall be capable of showing a measurement of”15 mm below LWL”.
9.6.3 If the steam generator is equipped with a safety water level limiter (see 9.12.1) then the lowest permissible water level (LWL) of the boiler (see Figure 2), which shall be permanently and legibly marked on the steam boiler shell and identified by the letters “LWL’, shall be at least 30 mm above the uppermost surface of the immersion heaters “UHS”. If the steam boiler is equipped with a safety temperature limiter instead of a water level limiter (see 9.12.1), the lowest permissible water level (LWL) shall be marked at the switch point of the safety temperature limiter.BS EN 14222 pdf download.