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A glossary of terms commonly used on WorkSafeBC.com.
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daily exposure
The amount of noise, stated in dBA Lex or Pa2h, to which a
worker is exposed during the workday.
damp location
An exterior or interior location that is subject to condensation
of moisture in, on or adjacent to portable electrical equipment.
danger area
An area in which there may be danger to persons or property
from flying material or other hazardous condition resulting from a blast.
dangerous incident
An accident or near miss occurrence caused by or as a result
of the use of explosives, and also includes an unexpected result or problem
with explosive products.
dangerous tree
Includes any tree that is hazardous to workers because of
location or lean, physical damage, overhead hazards, deterioration of the limbs,
stem or root system, or a combination of these.
day box
An unlicensed facility, not used for overnight storage, constructed
to Type 6 magazine specifications pursuant to the Explosives Act (Canada).
dBA
Decibels of noise, measured with an A-weighted filter.
dBA Lex
The level of a worker's total exposure to noise in dBA, averaged
over the entire workday and adjusted to an equivalent 8 hour exposure (for example,
a worker who works in an average of 85 dBA of noise for 16 hours has an Lex
of 88 dBA, and for four hours an Lex of 82 dBA).
designated work area
An area for work with asbestos-containing material which is
restricted to access by authorized persons by warning signs and by barricades,
enclosures or other means of isolation, with due regard for the level of risk.
decompression illness
A dysfunction caused by exposure to a reduction in pressure
resulting in the production of bubbles in the body.
decontamination facility
A series of rooms constructed so as to allow a person to enter
and leave a containment without spreading asbestos fibre or waste material beyond
the designated work area.
deep diving
Any diving operation to depths greater than 50 m (165 ft).
demolition
Tearing down, destruction, breakup, razing or removal of the
whole or part of a building or structure, or of free standing machinery or equipment
that is directly related to the function of the structure.
derrick
A stationary or portable structure used to support the hoisting
and lowering mechanism on a rig.
designated work area
An area for work with asbestos-containing material which is
restricted to access by authorized persons by warning signs and by barricades,
enclosures or other means of isolation, with due regard for the level of risk.
detonator or detonator products
Includes those explosives commonly called blasting caps, or
electric caps, or other similar devices used to detonate commercial explosives.
disconnecting
Physically disconnecting adjacent piping from a confined space
to prevent its contents from entering the space in the event of discharge.
dive profile
A logged schedule of the diver's activities during any diving
operation, which includes the time the surface was left, depth, decompression,
repetitive dives and other information concerning the diving operations.
dive site
Any location where a diving operation takes place including
a boat, scow, float, raft or platform which is seaworthy, secure, and of sufficient
size to safely accommodate all workers and equipment without overcrowding.
diver's harness
A harness, fitted with a positive buckling device and an attachment
point for a lifeline, that will prevent any strain on the diver's mask, helmet
and umbilical, that is worn by the diver and is strong enough to lift the diver
from the water in an emergency.
diver's tender
A worker who is competent and knowledgeable in the diving
apparatus being used, the diving operation in progress, emergency diving procedures
and communications between diver and tender.
diving supervisor
A person having complete and direct responsibility for the
diving operation who is knowledgeable and competent with the diving equipment,
the diving operations in progress, emergency diving procedures, diving physics
and physiology and medical aspects of diving.
double block and bleed
The closure of adjacent piping by locking out a drain or vent
in the open position in the line between 2 locked out valves in the closed position.
double-pole scaffold
A scaffold with boh ends of the bearers supported by connections
to posts or uprights.
drench hose
A flexible hose connected to a water supply and capable of
delivering a minimum of 11.4 litres of water per minute (2.5 imp gal per min),
for use to flush the eyes and/or skin.
dry-to-dry machine
A system in which the washing and drying is done in a single
machine that is vented to a vapour recovery system or to the atmosphere during
the drying and deodorizing phases of the machine cycle.
dump or tip
An accumulation of rock fragments or other unconsolidated
material formed by pushing or dropping the loose material over the crest and
allowing it to come to rest without further handling.
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