10 PERIODIC EXAMINATION OF BOILERS The boiler must be examined in accordance with a WSE which will specify the parts to be examined, the types of examination required and the intervals between them. Depending on the circumstances and degree of expertise available the WSE may be: x Written and certified by an independent CP; or x Written and certified by the in-house CP (so long as they are sufficiently independent from the operating function); or x Written in house by staff with sufficient technical capability, but certified by an independent CP. The overall examination consists of two parts, firstly with the boiler and its fittings stripped down ( “ out of service ” ) and then after it has been returned to operation ( “ in service ” examination). The second part of the examination includes verifying the protective devices are functioning correctly and it must be performed as soon as reasonably practicable after the out of service examination. In any event, pre-checks on the functionality of controls and protective devices should have already been performed by the user/owner as soon as the boiler was returned to operation. The protective devices that must be checked and/or tested include: x Pressure gauge; x Pressure controller; x Safety relief valve; followed by o Pressure limit switch; x Water level controls/limiters; x Flame detection device. The user/owner must ensure that any necessary preparatory work is completed so that the CP can carry out the examination safely. After the examination, the CP will issue a report of examination and all recommendations contained in the report shall be implemented. Other devices or controls not classed as protective devices in PSSR but should still be checked and tested include: x Fuel interruption lockout; x Fuel proving systems; x Control system power failure; x Mains power failure; x Critical alarms (including temperature alarms where fitted); x TDS alarm. SAFed Guidance PSG06: Examination of Pressure Systems in Accordance with Written Scheme of Examination , and PSG 07: Guidelines – on the PSSR SI 2000 No. 128 – Working examination requirements in WSE's provide further information.
BG01 Guidance on the safe Operation of Steam Boilers Edition 2 – © 2019
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