3.1
Flashpoint means the temperature
in degrees Celsius (closed cup test) at which a product will give
off enough flammable vapour to be ignited, as determined by an approved
flashpoint apparatus.
3.2
Auto-ignition point means the
temperature at which a substance will spontaneously combine with oxygen
and burn without an external ignition or heat source.
3.3
High temperature surfaces means
surfaces with temperatures above 220°C.
3.4
Hot surfaces means surfaces with
a temperature of less than 220°C including steam systems with
a pressure of less than 2.3 N/mm2, thermal oil systems,
exhaust gas piping and oilfired and exhaust gas boilers.
3.5
Heated surfaces means surfaces
with a high temperature source on the other side.
3.6
Potential ignition sources means
sources having enough energy to cause ignition. These include high
temperature surfaces, sparks or flames from inefficient flanges or
joints, electrical discharges caused from electrostatic atmospheres,
or electrical contactor faults. Sources of these are for example exhaust
gas piping of internal combustion engines, leakages from boiler furnace
joints and electrical equipment within oil treatment rooms.
3.7
Flammable oils, for the purpose
of these Guidelines, means those oils used in machinery spaces such
as those listed in table 1.
3.8
Flammable oil system means the
system used for the supply of flammable liquid to engines or equipment.
3.9
Lower flammable limit (LFL) means
the concentration of a hydrocarbon gas in air below which there is
insufficient hydrocarbon to support and propagate combustion.