What type of explosion risk zone would a place be if repairs to a methane drainage pipeline are being carried out there, if there is no other reason to identify it as a zone of that or any other type?

• A. ERZ1
• B. ERZ0
• C. NERZ
• D. Non-zone

Answer: (A)

Explosive atmosphere zones are about where methane could create a flammable mix and how that guides what equipment and controls are used. When repairs on a methane drainage pipeline are being carried out, there is a real chance that methane could be released during the work. That means an explosive atmosphere is likely to be present during normal operations or maintenance activities. So the area is classified as ERZ1. It would not be ERZ0, since there is a methane-related risk, and it wouldn't be a non-zone designation, which implies no explosion risk. In short, the maintenance context where methane could be released makes ERZ1 the correct designation.