2.2 Safety precautions and safety rules for natural gas
2.2.1 General
High concentrations of natural gas can cause dizziness and there is a risk of suffocation. Make
sure that all related spaces have good airflow.
Natural gas in low concentration is not dangerous to personnel.
Natural gas can be dangerous in a gas engine installation. Gas leakage into the engine room
can cause fires and explosions.
An explosion also can occur, if unburned gas flows into the exhaust gas system.
2.2.2 Definition of gas hazardous zones
The definitions of hazardous zones refer to IEC 600092-502:1999 and are as follows:
•
Zone Z0
This is an area in which an explosive gas atmosphere is continuously present or is
present for long periods.
Examples - Combustion chamber, gas pipes
•
Zone Z1
This is an area in which an explosive gas atmosphere can be present during usual
operation or during unusual operating conditions.
Examples - Piston under side, space of double wall pipe
•
Zone Z2
This is an area in which an explosive gas atmosphere usually is not present or is present
only for short periods, for example if a leakage occurs.
Examples - Exhaust gas system
The engine room and the engine crankcase are given as gas safe non-hazardous areas. Thus
they do not refer to the definitions of hazardous zones.
X72DF
AA00-0000-00AAA-012H-A
Maintenance Manual Safety precautions and safety rules for natural gas
Winterthur Gas & Diesel Ltd.
- 52 - Issue 002 2020-10
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