1202 / 1904
GENERAL
3
Empty CNG fuel lines from the tank to the
engine by shutting OFF mechanical valves on
CNG tanks and using diagnostic tester to empty
the CNG lines for repair work.
only carry out work which involves or removing
components from the CNG system in a safe
place and in the open air; before doing so,
disconnect the vehicle battery, and display
warning signs, e.g. ‘No smoking’ around the
area;
Do not carry out any work which could affect
the CNG system over or close to a vehicle
inspection pit or drain where dangerous
concentrations of vapour could accumulate.
Existing fixed lighting of the type which is
recessed into the pit wall, usually fitted at least
1 m from the pit floor, can continue to be used
provided it is sealed behind toughened plastic
or glass and protected against physical damage
and if the risk assessment shows it is safe to do
so. Portable tools, including hand lamps, used
in pits should be either air-powered or
explosion protected and can continue to be
used provided the risk assessment shows it is
safe to do so.
Maintain a minimum clearance of 1 m between
the area to be heated and the CNG fuel tank or
fuel lines; provide a heat resistant shield or
empty or gas-free the affected parts of the CNG
system where this clearance cannot be
achieved.
Hazard Identification
Human health hazards: Exposure to high CNG
vapour concentrations can lead to nausea,
headache, dizziness, and in extreme cases,
loss of consciousness and death in oxygen
deficient environments. Prolonged exposure to
vapour may affect the central nervous system.
Contact with liquid CNG can cause cold burns.
First Aid Measures
Symptoms and effects: Liquid may cause skin
and eye burns. Prolonged exposure to vapour
concentrations above the recommended
occupational exposure standard may cause
headache, dizziness, weakness, nausea,
confusion, blurred vision, asphyxiation, cardiac
irregularities, unconsciousness and even
death.
Protection of first aiders: Take appropriate
steps to avoid fire, explosion and inhalation
hazards.
First Aid - Inhalation: Remove the affected
person to fresh air. Keep warm and at rest. If
the casualty is stupor, some physical restraint
may be necessary to prevent injury. If breathing
but unconscious, place in the recovery position.
If breathing has stopped, apply artificial
respiration. If heartbeats absent, give external
cardiac compression. Monitor breathing and
pulse. OBTAIN MEDICAL ATTENTION
IMMEDIATELY.
First Aid - Skin: Drench affected parts with
water to normalize temperature Remove
contaminated clothing, rings, watches, etc., if
possible, but do not attempt to do so if they are
adhering to the skin. Do not attempt to reheat
the affected parts rapidly – reheat slowly. Cover
with a sterile dressing. Do not apply ointments
or powders. Note that contaminated clothing
may be a fire hazard. Contaminated clothing
should be soaked with water before being
removed. It must be laundered before reuse.
First Aid - Eye: DO NOT DELAY. Flush eye with
copious quantities of water to normalize
temperature. Cover eye with a sterile dressing.
OBTAIN
MEDICAL
ATTENTION
IMMEDIATELY.
First Aid - Ingestion: In the unlikely event of
ingestion, obtain medical attention immediately