7.2.2 Combustion control devices The system shall incorporate the following (as applicable):
x Ignition flame and main flame detection and safety systems; x Forced draught and induced draught fan proving systems; x Air and flue damper position proving systems;
x Flame detectors. High-integrity devices are required on all systems where the combustion system does not progress through a restart at least once per day; x Systems to monitor the correct ratios of fuel and air; x Interlocks where simultaneous fuel combustion is not permitted. 7.2.3 Pressure and temperature devices Heat input must be controlled automatically (refer to BS EN 12953 Part 6) as follows: x Steam boilers to be controlled by pressure controls; x Limiting devices must be fitted to prevent excessive pressure or temperature. For new boilers they must be in accordance with BS EN 12953 Part 9. Users/owners shall ensure that an adequate test regime for all pressure and temperature limiters is incorporated into the operating procedures for the boilers. 7.2.4 Water treatment plant The system shall incorporate the following (as applicable for the manning level): x Means for treating incoming water, such as base exchange or reverse osmosis; x Measurement and control devices to confirm that water flow is maintained, softened water is provided within the correct parameters, brine tanks are kept full of salt, and backwash is routinely and correctly carried out; x Devices to record hotwell temperatures and levels, and alarm on deviation; x Devices for monitoring condensate quality and potential contamination; x Means for safely collecting boiler water samples from appropriate locations (such as from inside the boiler, from the hotwell, in the condensate return line, and from the softener outlet); x Means for delivering water treatment chemicals at appropriate points in the system with measurement and control devices to alarm if chemical dosing is low or out of specification, chemical stocks are low, or chemical dosing plant has failed (dosing pump faults, leaks, etc.); x Equipment for on-site measurement and testing of boiler water parameters. Increasing time between boiler house visits will increase the quantity and quality of the feed water and condensate monitoring and alarm equipment that is required.
BG01 Guidance on the safe Operation of Steam Boilers Edition 2 – © 2019
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