This unified requirement concerns machinery spaces as defined
in Ch. II-2, Reg. 3.20 of the 1981 SOLAS Amendments, i.e.:
'Machinery spaces' are all machinery spaces of Category
A as defined in 1981 SOLAS Amendments and all other spaces containing
propulsion machinery, boilers, oil fuel units, steam and internal
combustion engines, generators and major electrical machinery, oil
filling stations, refrigerating, stabilising, ventilation and air
conditioning machinery, and similar spaces, and trunks to such spaces.
Spaces which contain oil-fired equipment other than boilers,
such as inert gas generators, incinerators, waste disposal units etc.,
shall be considered as machinery spaces of Category A.
"Oil fuel unit" as defined in SOLAS Amendments includes
any equipment used for the preparation and delivery of oil fuel, heated
or not, to boilers (including inert gas generators) and engines (including
gas turbines) at a pressure of more than 0,18 N/mm2.