1.2.1 “Diluted": the condition in which
the concentration of a flammable gas in a flammable gas/air mixture
is less than 50% of the lower explosive limit of the gas.
1.2.2 “Enriched": the condition in which
the concentration of a flammable gas in a flammable gas/air mixture
is not less than 150% of the upper explosive limit of the gas. When
flammable gases are mixed to achieve an enriched condition, the upper
explosive limit of the flammable gas mixture shall be used.
1.2.3 “Flammable cargoes" means cargoes
of crude oil, petroleum products, and chemicals having a flashpoint
not exceeding 60°C (closed cup test), as determined by an approved
flashpoint apparatus, and a Reid vapour pressure which is below atmospheric
pressure and other liquid products having a similar fire hazard.
1.2.4 “Inerted:" the condition in which
the oxygen content in a flammable gas/air mixture is 8% or less by
volume.
1.2.5 “Independent" as applied to two systems
means that one system will operate with a failure of any part of the
other system except power sources and electrical feeder panels.
1.2.6 “Maximum allowable transfer rate"
means the maximum volumetric rate at which a tanker may receive cargo
or ballast.
1.2.7 “Tanker vapour connection" means the
point in a tanker's fixed vapour collection system where it connects
to a vapour collection hose or arm.
1.2.8 “Terminal vapour connection" means
the point in a terminal's vapour collection system where it connects
to a vapour collection hose or a vapour collection arm.
1.2.9 “Vapour balancing" means the transfer
of vapour displaced by incoming cargo from the tank of a tanker receiving
cargo into a tank of a facility delivering cargo via a vapour collection
system.
1.2.10 “Vapour collection system" means
an arrangement of piping and hoses used to collect vapour emitted
from a tanker's cargo tanks and transport the vapour to a vapour processing
unit.
1.2.11 “Vapour destruction unit" means a
vapour processing unit that destroys cargo vapour by a means such
as incineration.
1.2.12 “Vapour dispersion system" means
a vapour processing unit which releases cargo vapour to the atmosphere
through a venting system not located on the tanker being loaded or
ballasted.
1.2.13 “Vapour emission control system"
means an arrangement of piping and hoses used to control vapour emissions
collected from a tanker, and includes the vapour collection system
and the vapour processing unit.
1.2.14 “Vapour processing unit" means the
components of a vapour control system that recovers, destroys, or
disperses vapour collected from a tanker.
1.2.15 “Vapour recovery unit" means a vapour
processing unit that recovers cargo vapour by a non-destructive means
such as lean oil absorption, carbon bed adsorption, or refrigeration.