| (1) |
Classification of hazardous locations established and documented by a professional engineer under the engineer's seal and signature shall be the area classification. |
(2) |
Where a facility has not been classified in accordance with subrule (1), or evidence of an engineer's involvement is not satisfactory to the inspection authority having jurisdiction, Rules 19-102 to 19-108 shall be the minimum requirement. |
| (1) |
The following are Class I, Zone 0 hazardous locations: |
|
(a) |
the vapour space inside enclosed vessels or tanks containing a substance capable of producing an explosive gas atmosphere; |
|
(b) |
the area within 0.5 m around an atmospheric vent venting from a Zone 0 area.; |
|
(c) |
the area within 0.5 m around an equipment process vent; and |
|
(d) |
the area within 0.15 m around an instrument or control device vent. |
| (2) |
The following are Class I, Zone 1 hazardous locations: |
|
(a) |
the interior of buildings or enclosures housing tanks, pumps, valves, flanges or other equipment that is a potential source of leakage of flammable liquid, gas or vapour, except shed type enclosures shall be permitted to be Class I Zone 2 hazardous locations when open on 3 sides from grade to roof level and roof ventilators are provided where lighter-than-air gases may accumulate; |
|
(b) |
the interior of buildings or enclosures, any part of which is located in a Class I, Zone 1 hazardous location, unless the buildings or enclosures are separated from the classified area by a vapour?tight barrier; |
|
(c) |
any pit, depression or area below grade in a Class I, Zone 2 hazardous location where flammable liquids or flammable heavier-than-air gases and vapours may accumulate; |
|
(d) |
the area within 1.5 m of a tool launcher/receiver opening or other similar facility; |
|
(e) |
the area around atmospheric vents: |
|
|
(i) |
for 1.5 m when venting from a Zone 1 area; or |
|
|
(ii) |
between 0.5 m and 1.5 m when venting from a Zone 0 area; |
|
(f) |
the area between 0.5 m and 1.5 m around an equipment process vent; |
|
(g) |
the area between 0.15 m and 0.5 m around an instrument or control device vent. |
| (3) |
The following are Class I, Zone 2 hazardous locations: |
|
(a) |
outdoor or unenclosed areas within 3 m in any direction of a potential source of leakage of flammable liquid, gas or vapour; |
|
(b) |
outdoor areas within 3 m of the outer confines of buildings or enclosures that are Class I, Zone 1 hazardous locations, plus an additional horizontal distance of 4.5 m to a height of 450 mm above grade level where flammable liquids or flammable heavier-than-air gases and vapours may accumulate, unless the outer confines of the building are vapour-tight; |
|
(c) |
the area within 3 m in any direction of any flammable gas or liquid storage vessel or tank and, where flammable liquids or flammable heavier-than-air gases and vapours may accumulate: |
|
|
(i) |
an additional horizontal distance of 4.5 m to a height of 450 mm above grade level, or |
|
|
(ii) |
when a dike is provided, the area within the perimeter and extending up to the top of the dike; |
|
(d) |
the interior of buildings or enclosures, any part of which is located in a Class I, Zone 2 hazardous location, unless the buildings or enclosures are separated from the classified area by a vapour-tight barrier; |
|
(e) |
the area between 1.5 m and 3 m of a tool launcher/receiver opening or other similar facility; |
|
(f) |
the area around atmospheric vents: |
|
|
(i) |
for 3 m when venting from a Zone 2 area; or |
|
|
(ii) |
between 1.5 m and 3 m when venting from a Zone 1 or Zone 0 area; |
|
(g) |
the area between 1.5 m and 3 m around an equipment process vent; and |
|
(h) |
the area between 0.5 m and 1 m around an instrument or control device vent. |
| (a) |
the interior of buildings or enclosures housing tanks for normal well kill or circulating fluids where the fluids do not normally contain substances capable of creating an explosive gas atmosphere; |
| (b) |
the interior of buildings or enclosures housing open mixing or solids control apparatus; |
| (c) |
areas within 2 m of mud tanks and shale shakers where an enclosure is not provided; |
| (d) |
the entire area above the rig floor to the top of the enclosure, if provided, or to a height of 3 m, whichever is greater; |
| (e) |
the entire area under the rig floor or the area below the rig floor within 2 m horizontally of the centre of the well where the substructure is of the open type; |
| (f) |
the area within 2 m horizontally of the centre of the well and 3 m vertically of the uppermost well bore opening where a rig floor is not provided; and |
| (g) |
the area within the choke manifold building. |
| (1) |
The area within 1.5 m in any direction of a casing vent where explosive gas atmospheres are present under normal operation is a Class I, Zone 1 hazardous location. |
| (2) |
The following are Class I, Zone 2 hazardous locations: |
|
(a) |
the area within 1.5 m in any direction of a casing vent where explosive gas atmospheres are not present under normal operation; |
|
(b) |
the area between 1.5 m and 3 m in any direction of a casing vent where explosive gas atmospheres are present under normal operation; and |
|
(c) |
the area within 1.5 m horizontally of a junction box used for connection to a submersible pump downhole cable and extending from 1.5 m above the box to grade level, unless a wellhead feed-through-device is installed that prevents the migration of explosive gas atmospheres through the cable. |
| (a) |
the interior of buildings or enclosures housing produced water injection wells; and |
| (b) |
the interior of buildings in which water produced in conjunction with crude oil or fresh water containing gas is stored or processed or is subject to pumping operations. |
