Zone Demarcation
Page 8
Zones where flammable gases may be present are defined and marked on Site Area Classification Drawings. The actual markings used witl not be the same on all drawings. The drawing key will give details of the markings that are used.
NOTE
Note: Some Operators use colour hatching to distinguish the different gas subdivisions and temperature classes. In these instances care is needed with photocopies if they are black and white.