The positioning of gas detection systems is of vital importance to ensuring their correct operation; the use of certain gases such as LPG will require careful consideration. Always consult the equipment manufacturer on the correct placement of sensors. It is recommended that emergency push buttons isolate all fuels and power to the burners using the fuel train safety shut-off valves rather that the fitting of an extra automatic isolating valve. In most control systems it is possible to achieve this remotely so causing the system to go to lockout. 7.5 Typical control arrangements The notes and diagrams in Appendix 3 describe three different typical steam boiler arrangements that might apply to different installations. They are not definitive drawings of actual installations and must not be interpreted as being compliant with any particular circumstance – a boiler house technical risk assessment will always be required for every boiler house. They should also not be used as procurement instructions for particular boiler installations . The levels of attendance and manual testing will depend on the boiler and equipment layouts. They must be considered in conjunction with the findings of the risk assessment and information on the type and level of manning that is intended to be employed. It is more important that the target levels of monitoring and supervision are met rather than having a boiler that matches the example in the diagram. Different operating scenarios may well dictate different levels of supervision for the same level of automation. The relationship between automation levels and supervision levels is discussed in more detail in Section 5.
BG01 Guidance on the safe Operation of Steam Boilers Edition 2 – © 2019
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