Part | Location | Extent of classified area1 | Equipment must be suitable for Class I, Group D2 |
A | Storage containers other than DOT cylinders | | Within 15 feet in all directions from connections, except connections otherwise covered in this table | | Division 2 |
B | Tank vehicle and tank car loading and unloading3 | | Within 5 feet in all directions from connections regularly made or disconnected for product transfer | | Division 1 |
| | | Beyond 5 feet but within 15 feet in all directions from a point where connections are regularly made or disconnected and within the cylindrical volume between the horizontal equator of the sphere and grade (See Figure H-1) | | Division 2 |
C | Gauge vent openings other than those on DOT cylinders | | Within 5 feet in all directions from point of discharge | | Division 1 |
| | | Beyond 5 feet but within 15 feet in all directions from point of discharge | | Division 2 |
D | Relief valve discharge other than those on DOT cylinders | | Within direct path of discharge | | Division 1 Note: Fixed electrical equipment should not be installed |
| | | Within 5 feet in all directions from point of discharge | | Division 1 |
| | | Beyond 5 feet but within 15 feet in all directions from point of discharge except within the direct path of discharge | | Division 2 |
E | Pumps, compressors, gas-air mixers and vaporizers other than direct fired | | | | |
| Indoors without ventilation | | Entire room and any adjacent room not separated by a gastight partition | | Division 1 |
| | | Within 15 feet of the exterior side of any exterior wall or roof that is not vaportight or within 15 feet of any exterior opening | | Division 2 |
| Indoors with adequate ventilation4 | | Entire room and any adjacent room not separated by a gastight partition | | Division 2 |
| Outdoors in open air at or above grade | | Within 15 feet in all directions from this equipment and within the cylindrical volume between the horizontal equator of the sphere and grade (See Figure H-1) | | Division 2 |
F | Service station dispensing units | | Entire space within dispenser enclosure, and 18 inches horizontally from enclosure exterior up to an elevation 4 ft. above dispenser base. Entire pit or open space beneath dispenser | | Division 1 |
| | | Up to 18 inches above grade within 20 ft. horizontally from any edge of enclosure | | Division 2 |
| | | Note: For pits within this area, see Part F of this table | | |
G | Pits or trenches containing or located beneath LP-gas valves, pumps, compressors, regulators, and similar equipment | | | | |
| Without mechanical ventilation | | Entire pit or trench | | Division 1 |
| | | Entire room and any adjacent room not separated by a gastight partition | | Division 2 |
| | | Within 15 feet in all directions from pit or trench when located outdoors | | Division 2 |
| With adequate mechanical ventilation | | Entire pit or trench | | Division 2 |
| | | Entire room and any adjacent room not separated by a gastight partition | | Division 2 |
| | | Within 15 feet in all directions from pit or trench when located outdoors | | Division 2 |
H | Special buildings or rooms for storage of portable containers | | Entire room | | Division 2 |
I | Pipelines and connections containing operational bleeds, drips, vents or drains | | Within 5 ft. in all directions from point of discharge | | Division 1 |
| | | Beyond 5 ft. from point of discharge, same as Part E of this table | | |
J | Container filling | | | | |
| Indoors without ventilation | | Entire room | | Division 1 |
| Indoors with adequate ventilation4 | | Within 5 feet in all directions from connections regularly made or disconnected for product transfer | | Division 1 |
| | | Beyond 5 feet and entire room | | Division 2 |
| Outdoors in open air | | Within 5 feet in all directions from connections regularly made or disconnected for product transfer | | Division 1 |
| | | Beyond 5 feet but within 15 feet in all directions from a point where connections are regularly made or disconnected and within the cylindrical volume between the horizontal equator of the sphere and grade (See Fig. H-1.) | | Division 2 |