Safety Measures And Rules Of Cleanliness When Working On Vehicles With Natural Gas; System (Cng) - Skoda Octavia IV 2020 Service Manual

Octavia IV 2020 ➤, Octavia IV 2021 ➤
Maintenance - Edition 12.2020
10.2 Safety measures and rules of cleanli‐
ness when working on vehicles with
natural gas system (CNG)
⇒ m10.2.1 easures, safety at work", page 234
⇒ o10.2.2 f cleanliness", page 236
10.2.1 Safety measures, safety at work
DANGER!
♦ Natural gas is highly flammable and forms ignitable mix‐
tures with air.
♦ At least one source of natural ventilation must be assur‐
ed at all times.
♦ As natural gas is lighter than air, it will always rise to the
top.
♦ No sources of ignition must be located close to the natu‐
ral gas system (as well as other spark- or flame-produc‐
ing systems).
♦ The inhalation of natural gas can cause drowsiness and
lung damage. In high concentrations, it results in a risk
of asphyxia due to lack of oxygen.
♦ Natural gas is not "odourless". For safety reasons it
is saturated with odour intensive substances and even
small quantities of natural gas can be detected.
There is the risk of gas escaping!
System is under pressure:
♦ The operating pressure achieves a maximum value of
around 160-200 bar and higher in the high pressure sys‐
tem, i.e. in the natural gas pressure containers (CNG),
including connection lines as far as the electromechani‐
cal high-pressure regulator.
♦ The operating pressure achieves a value of around
5...10 bar in low-pressure operation, i.e. at the output
of the electromechanical high-pressure regulator.
Every natural gas tank is fitted with a solenoid valve, which
closes automatically after switching off the ignition or in petrol
mode.
A safety valve is also fitted to every natural gas tank (exces‐
sive heat and pressure build-up). This safety valve prevents
uncontrolled pressure build-up in the natural gas tank in case
of fire.
A flow limiter prevents a sudden emptying of the natural gas
tank in the event of damage to the pressure system.
234
10. Natural gas system