3.2.1 For all fired boilers, the pre-purge is to be sufficient to give at
least 5 air changes in the furnace and/or at least 2,5 complete air changes of the
furnace and uptakes, whichever is greater.
3.2.2 Combustion air is to be taken from a safe area.
3.2.3 Gas-fired boilers are to be fitted with fuel oil pilot igniter system. A
fuel gas system or electric spark ignition for the main burner are not acceptable
systems.
3.2.4 Gas detectors are to be fitted in the combustion air intake trunking,
that will shut down the boiler and alarm at a manned station.
3.2.5 Boilers are to be located in areas designated ‘safe areas’. If the
boiler cannot be fitted in an area designated ‘safe area’ then it must be fitted
with the following:
- The furnace must be a closed front type.
- The combustion air must be ducted from an area designated a
‘safe area’ and fitted with a flame arrestor.
- The combustion air intake is to be fitted with a gas detector
which will alarm and shut down the flame on gas detection.
- A gas detector is to be fitted near to the boiler in the
compartment in which the boiler is located.
- The maximum surface temperatures as given in the Rules are to
be complied with.
3.2.8 For boilers located in a safe area, combustion air may be taken from the
boiler compartment.
3.2.9 Boiler compartment ventilation is to be a minimum of 12 air changes per
hour.
3.2.10 All boilers are to be fitted with a method of leak detection depending
upon the fluid contained in the boiler. Adequate leak collection and drainage is to
be provided.
Figure 14.3.1 Diagram showing the typical
arrangements for a boiler room
3.2.11
Thermal oil boilers/heaters