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7/2/2019 Page 7 of 11

Hazardous Areas – Oil / Water Separator

The new book gives a much better visual representation of the hazardous areas around a oil / water separator.
The area surrounding the separator vent pipe opening has increased from a Zone 2 at 300mm radius to a Zone 1
of 1m radius. The areas within the access chamber, surrounding the chamber, and within the tank have been
classified as shown below.

Fig 3.6 – Typical hazardous area classification for an oil / water separator

Hazardous Areas – Spillages

The new book has several additions, the first of which is the zones around a fuel spillage. The area surrounding
a spillage is classified as a Zone 2 hazardous area, the dimensions of which depend upon the size of the spill as
shown in table 3.1 reproduced below.

Length of spillage Hazard radius
L (m) R (m)
Less than 5 3
5 to less than 10 7.5
10 or greater 15

Table 3.1 – Zone 2 hazardous area arising from a petrol spillage

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Environmental Bulletin No 9 Zones.doc