This Standard specifies requirements for unattended and limited attendance boilers which are intended to be operated for periods without human supervision. It includes special features within the control, management and supervision systems, associated valves and fittings, housing and installation, as well as requirements and responsibilities for checking, testing and maintenance of these boilers.The limits on the type, design criteria, and usage of unattended and limited attendance boilers to which this Standard is intended to apply are as follows:(a) Boilers for fixed land installations.(b) Boilers having a design pressure as shown in Table 1.1.(c) Boilers having a power output within the capacity specified in Table 1.1 for the boiler type and category. (See Note 1.)(d) Boilers complying with the supervision and maintenance requirements specified in Table 1.1 for the boiler type and category.(e) Boilers for the generation of steam, or other vapour, for which duty the types of boilers permitted are -(i) water-tube type electric type or low hazard type (see Table 1.1) for unattended operation; and(ii) any type of boiler for limited attendance operation (see Table 1.1).(f) Boilers for the heating of water or other liquids at a pressure above that of the atmosphere and to a temperature not less than the normal atmospheric boiling temperature of the liquid, for which duty any type of boiler complying with AS 1228 or AS 1797 is permitted for unattended operation, provided that for other than water-tube and electric type boilers, steam or vapour is not generated in the boiler and the boiler drum or shell is fully flooded.(g) Boilers having any of the following sources of energy input:(i) Gas fuel (mains or other gases).(ii) Oil fuel with a closed flashpoint greater than 23C. (iii) Solid fuels, including solid-fuel-in-suspension.(iv) Waste heat fluids.(v) Electric power.NOTES:1 This Standard may also be applied to boilers outside the limits specified in Items (a) to (g) in Clause 1.1 where equivalent safety and reliability are ensured and the boiler and its installation are acceptable to the regulatory authority. Current requirements of some regulatory authorities may vary from the criteria given in Table 1.1.2 Except for definitions in Clause 1.3, other clauses in the Standard refer to steam and water only. It is intended that the Standard may be applied to other fluids subject to acceptance by and compliance with any additional safety features required by the regulatory authority.
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