Location | Class I Group D division | Extent of classified area |
Tank vehicle and tank car:1 Loading through open dome ————————— | | |
| 1 | Within 3 feet of edge of dome, extending in all directions. |
| 2 | Area between 3 feet and 5 feet from edge of dome, extending in all directions. |
Loading through bottom connections with atmospheric venting ———————— | | |
| 1 | Within 3 feet of point of venting to atmosphere, extending in all directions. |
| 2 | Area between 3 feet and 5 feet from point of venting to atmosphere, extending in all directions. Also up to 18 inches above grade within a horizontal radius of 10 feet from point of loading connection. |
Loading through closed dome with atmospheric venting ———————— | | |
| 1 | Within 3 feet of open end of vent, extending in all directions. |
| 2 | Area between 3 feet and 5 feet from open end of vent, extending in all directions. Also within 3 feet of edge of dome, extending in all directions. |
Loading through closed dome with vapor recovery ———————— | | |
| 2 | Within 3 feet of point of connection of both fill and vapor lines, extending in all directions. |
Bottom loading with vapor recovery or any bottom unloading ——————— | | |
| 2 | Within 3 feet of point of connections extending in all directions. Also up to 18 inches above grade within a horizontal radius of 10 feet from point of connection. |
Drum and container filling: Outdoors, or indoors with adequate ventilation ——————— | | |
| 1 | Within 3 feet of vent and fill opening, extending in all directions. |
| 2 | Area between 3 feet and 5 feet from vent or fill opening, extending in all directions. Also up to 18 inches above floor or grade level within a horizontal radius of 10 feet from vent or fill opening. |
Outdoors, or indoors with adequate ventilation ——————— | | |
| 1 | Within 3 feet of vent and fill opening, extending in all directions. |
| 2 | Area between 3 feet and 5 feet from vent or fill opening, extending in all directions. Also up to 18 inches above floor or grade level within a horizontal radius of 10 feet from vent or fill opening. |
Tank—Aboveground: Shell, ends, or roof and dike area —————— | | |
| 2 | Within 10 feet from shell, ends, or roof of tank, area inside dikes to level of top of dike. |
Vent ————————— | 1 | Within 5 feet of open end of vent, extending in all directions. |
| 2 | Area between 5 feet and 10 feet from open end of vent, extending in all directions. |
Floating roof —————— | 1 | Area above the roof and within the shell. |
Pits: Without mechanical ventilation ——————— | | |
| 1 | Entire area within pit if any part is within a Division 1 or 2 classified area. |
With mechanical ventilation ——————— | | |
| 2 | Entire area within pit if any part is within a Division 1 or 2 classified area. |
Containing valves, fittings or piping, and not within a Division 1 or 2 classified area ————— | | |
| 2 | Entire pit. |
Pumps, bleeders, withdrawal fittings, meters and similar devices: Indoors ———————— | | |
| 2 | Within 5 feet of any edge of such devices, extending in all directions. Also up to 3 feet above floor or grade level within 25 feet horizontally from any edge of such devices. |
Outdoors ——————— | 2 | Within 3 feet of any edge of such devices, extending in all directions. Also up to 18 inches above grade level within 10 feet horizontally from any edge of such devices. |
Storage and repair garage for tank vehicles ———————— | | |
| 1 | All pits or spaces below floor level. |
| 2 | Area up to 18 inches above floor or grade level for entire storage or repair garage. |
Drainage ditches, separators, impounding basins ————————— | | |
| 2 | Area up to 18 inches above ditch, separator or basin. Also up to 18 inches above grade within 15 feet horizontally from any edge. |
Garages for other than tank vehicles —————— | | |
| Ordinary | If there is any opening to these rooms within the extent of an outdoor classified area, the entire room must be classified the same as the area classification at the point of the opening. |
Outdoor drum storage ———— | Ordinary | |
Indoor warehousing where there is no flammable liquid transfer ———————— | | |
| Ordinary | If there is any opening to these rooms within the extent of an indoor classified area, the room must be classified the same as if the wall, curb or partition did not exist. |
Office and rest rooms ————— | Ordinary | |
| | |
1 | When classifying the extent of the area, you must give consideration to the fact that tank cars or tank vehicles may be spotted at varying points. Therefore, you must use the extremities of the loading or unloading positions. |
(6) Sources of ignition. You must not handle, draw, or dispense Category 1 or 2 flammable liquids, or Category 3 flammable liquids with a flashpoint below 100°F (37.8°C), where flammable vapors may reach a source of ignition. You must prohibit smoking except in designated localities. You must conspicuously post "No smoking" signs where hazard from flammable liquid vapors is normally present.
(7) Drainage and waste disposal. You must make provisions to prevent flammable liquids which may be spilled at loading or unloading points from entering public sewers and drainage systems, or natural waterways. You must provide connection to such sewers, drains, or waterways by which flammable liquids might enter with separator boxes or other approved means whereby such entry is precluded. You must not dump crankcase drainings and flammable liquids into sewers, but you must store them in tanks or tight drums outside of any building until removed from the premises.
(8) Fire control. Suitable fire-control devices, such as small hose or portable fire extinguishers, must be available to locations where fires are likely to occur. Additional fire-control equipment may be required where a tank of more than 50,000 gallons individual capacity contains Category 1 or 2 flammable liquids, or Category 3 flammable liquids with a flashpoint below 100°F (37.8°C), and where an unusual exposure hazard exists from surrounding property. Such additional fire-control equipment shall be sufficient to extinguish a fire in the largest tank. The design and amount of such equipment must be in accordance with approved engineering standards.
[Statutory Authority: RCW
49.17.010,
49.17.040,
49.17.050, and
49.17.060. WSR 17-02-066, § 296-24-33013, filed 1/3/17, effective 2/3/17; WSR 15-24-100, § 296-24-33013, filed 12/1/15, effective 1/5/16. Statutory Authority: RCW
49.17.010,
49.17.040,
49.17.050,
49.17.060 and 29 C.F.R. 1910 Subpart Z. WSR 14-07-086, § 296-24-33013, filed 3/18/14, effective 5/1/14. Statutory Authority: Chapter
49.17 RCW. WSR 94-15-096 (Order 94-07), § 296-24-33013, filed 7/20/94, effective 9/20/94; WSR 91-24-017 (Order 91-07), § 296-24-33013, filed 11/22/91, effective 12/24/91. Statutory Authority: RCW
49.17.040 and
49.17.050. WSR 85-10-004 (Order 85-09), § 296-24-33013, filed 4/19/85; Order 76-6, § 296-24-33013, filed 3/1/76; Order 73-5, § 296-24-33013, filed 5/9/73 and Order 73-4, § 296-24-33013, filed 5/7/73.]