Typical Arrangement 2 This shows the minimum equipment required for a boiler with critical alarms monitored on- site by a remote panel located in a manned area such as a gatehouse. New installations shall be manufactured to BS EN 12953, which requires additional limiters to be fitted. With typical Arrangement 2 the following factors need to be considered: x Attendance: A suitably trained and instructed person must be on-site at all times that the boiler is operating and must be capable of responding to an alarm condition. As a minimum, that person must ensure that the boiler has shut down and notify the boiler operator of the alarm condition. x The competent boiler operator must check the boiler at least once every day. x Equipment Integrity: Low water level devices and an excess pressure device of the high integrity type must be fitted. All control equipment must be fail-safe. Some types of high integrity self-checking photocell need professional adjustment and setting, and the manufacturer’s recommendations and timescales must be followed. x Boiler house fire protection: Fire detection shall be provided. For oil fired installations, automatic fuel shut-off must be provided. For gas firing, gas detection and alarm shall also be considered. x Minimum frequency of routine testing: o Low water level devices fitted directly to the boiler: o Weekly: The low water level cut-out and lock-out shall be tested by lowering the boiler water level by evaporation and controlled blow down. Discharge temperature to drain must not exceed permissible limits. o Low water level devices in external chambers fitted with automatic blow down facilities: o Daily: External chambers shall be automatically blown down at intervals typically of at least every six hours. o Weekly: In addition to the daily test, the low water level cut-out and lock- out shall be tested by lowering the boiler water level by evaporation and controlled blow down. Discharge temperature to drain must not exceed permissible limits. x Level Indicators (gauge glasses): Manually blown down at least once per day. x Boiler and feed water: Monitoring of the water treatment plant parameters, hotwell temperature and water sample test results. It is strongly recommended that gauge glasses on steam boilers are always left open to the boiler during normal operation and the connections to the gauge glasses shall be fitted with auto shut off devices for safety of boiler operatives.
BG01 Guidance on the safe Operation of Steam Boilers Edition 2 – © 2019
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