(3 ft to 10 ft) horizontally from any edge of such equipment
Tank storage installations inside buildings

1 All equipment located below grade level

2 Any equipment located at or above grade level

Tank - aboveground
Shell, ends, or roof and dike area
Vent
Floating roof with fixed outer roof Floating roof with no fixed outer roof
Underground tank fill opening
Inside fixed roof tank
Area inside dike where dike height is greater than the distance from the tank to the dike for more than 50 percent of the tank circumference Within 3.0 m (10 ft) from shell,
ends, or roof of
tank; also, area inside dike to level of top of tank Area inside of vent piping or opening
Within 1.5 m (5 ft) of open end of vent,
extending in all directions Area between 1.5 m and 3.0 m (5 ft and 10 ft)
from open end of vent, extending in all directions Area between the floating and fixed
roof sections
and within the shell Area above the floating roof and within the shell
Any pit, or space below grade level, if any part is within a Division 1 or 2, or Zone 1 or 2, classified location
Up to 450 mm (18 in.) above grade level within a horizontal radius of 3.0 m (10 ft) from a loose fill connection, and within a horizontal radius of 1.5 m (5 ft) from a tight fill connection
Vent - discharging upward 0 Area inside of vent piping or opening
1 Within 900 mm (3 ft) of open end of vent, extending in all directions
Vent - discharging upward (cont'd.)
Drum and container filling - outdoors or indoors
Area between 900 mm and 1.5 m (3 ft and 5 ft) of open end of vent, extending in all directions
Area inside the drum or container
Within 900 mm (3 ft) of vent and fill openings, extending in all directions
Area between 900 mm and 1.5 m (3 ft and 5 ft) from vent or fill opening, extending in all directions; also, up to 450 mm (18 in.) above floor or grade level within a horizontal
radius of 3.0 m (10 ft) from vent or fill
opening
Pumps, bleeders, withdrawal fittings Indoors
Outdoors
Within 1.5 m (5 ft) of any edge of such
devices, extending in all directions; also, up to 900 mm (3 ft) above floor or grade level within 7.5 m (25 ft) horizontally from any edge of such devices
Within 900 mm (3 ft) of any edge of such devices, extending in all directions. Also, up to 450 mm (18 in.) above grade level within
3.0 m (10 ft) horizontally from any edge of
such devices
Pits and sumps Without mechanical ventilation
With adequate mechanical ventilation
Containing valves, fittings, or piping, and not within a Division 1 or 2, or Zone 1 or 2, classified location
Entire area within a pit or sump if any part is within a Division 1 or 2, or Zone 1 or 2,
classified location Entire area within a pit or sump if any part