- Part Number:1910
- Part Number Title:Occupational Safety and Health Standards
- Subpart:1910 Subpart H
- Subpart Title:Hazardous Materials
- Standard Number:
- Title:Flammable liquids.
- GPO Source:
TABLE H-18 - ELECTRICAL EQUIPMENT HAZARDOUS AREAS - BULK PLANTS ___________________________________________________________________ | | |Class I | Location |Group D | Extent of classified area |division| ____________________________|________|____________________________ | | 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 | 1 | Within 3 feet of point of connections with | | venting to atmosphere atmospheric venting. | | 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 | 1 | Within 3 feet of open end dome with atmospheric | | of vent, extending in venting. | | 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 | 2 | Within 3 feet of point of dome with vapor | | connection of both fill recovery. | | and vapor lines, extending | | in all directions. Bottom loading with vapor | 2 | Within 3 feet of point of recovery or any bottom | | connections extending in unloading. | | all directions. Also up to | | 18 inches above grade with | | in a horizontal radius of | | 10 feet from point of | | connection. Drum and container filling: | | Outdoors, or indoors with | 1 | Within 3 feet of vent and adequate ventilation. | | 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 | 2 | Within 10 feet from shell, dike area................ | | 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 | 1 | Entire area within pit if any ventilation.............. | | part is within a Division | | 1 or 2 classified area. With mechanical | 2 | Entire area within pit if any ventilation.............. | | part is within a Division | | 1 or 2 classified area. Containing valves, | 2 | Entire pit. fittings or piping, and | | not within a Division | | 1 or 2 classified area. | | 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 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 | 1 | All pits or spaces below for tank vehicles...... | 2 | floor level. | | Area up to 18 inches above | | floor or grade level for | | entire storage or repair | | garage. Drainage ditches, | 2 | Area up to 18 inches above separator, impounding | | ditch, separator or basin. basins. | | Also up to 18 inches above | | grade within 15 feet | | horizontally from any edge. Garages for other than | (2) | If there is any opening to tank vehicles.......... | | these rooms within the | | extent of an outdoor | | classified area, the | | entire room shall be | | classified the same as the | | area classification at the | | point of the opening. Outdoor drum storage..... | (2) | Indoor warehousing where | (2) | If there is any opening to there is no flammable | | these rooms within the liquid transfer. | | extent of an indoor | | classified area, the | | entire room shall be | | classified the same as if | | the wall, curb or | | partition did not exist. Office and rest rooms.... | (2) | ____________________________|________|______________________________ Footnote(1) When classifying the extent of the area, consideration shall be given to the fact that tank cars or tank vehicles may be spotted at varying points. Therefore, the extremities of the loading or unloading positions shall be used. Footnote(2) Ordinary.
"Dispensing systems" -
"Location." Dispensing devices at automotive service stations shall be so located that all parts of the vehicle being served will be on the premises of the service station.
"Inside location." Approved dispensing units may be located inside of buildings. The dispensing area shall be separated from other areas in an approved manner. The dispensing unit and its piping shall be mounted either on a concrete island or protected against collision damage by suitable means and shall be located in a position where it cannot be struck by a vehicle descending a ramp or other slope out of control. The dispensing area shall be provided with an approved mechanical or gravity ventilation system. When dispensing units are located below grade, only approved mechanical ventilation shall be used and the entire dispensing area shall be protected by an approved automatic sprinkler system. Ventilating systems shall be electrically interlocked with gasoline dispensing units so that the dispensing units cannot be operated unless the ventilating fan motors are energized.
"Emergency power cutoff." A clearly identified and easily accessible switch(es) or a circuit breaker(s) shall be provided at a location remote from dispensing devices, including remote pumping systems, to shut off the power to all dispensing devices in the event of emergency.
"Remote pumping systems."
"Marine service stations" -
"Tanks and pumps."
Piping between shore tanks and dispensing units shall be as described in paragraph (c) of this section, except that, where dispensing is from a floating structure, suitable lengths of oil-resistant flexible hose may be employed between the shore piping and the piping on the floating structure as made necessary by change in water level or shoreline.
TABLE H-19 - ELECTRICAL EQUIPMENT HAZARDOUS AREAS - SERVICE STATIONS ____________________________________________________________________ | | |Class I | Location |Group D | Extent of classified area |division| _______________________|________|___________________________________ | | Underground tank: | | Fill opening..........| 1 | Any pit, box or space below grade | | level, any part of which is | | within the Division 1 or 2 | | classified area. | 2 | Up to 18 inches above grade level | | within a horizontal radius of | | 10 feet from a loose fill | | connection and and within a | | horizontal radius of 5 feet | | from a tight fill connection. Vent-Discharging | | Upward. | 1 | Within 3 feet of open end of | | vent, extending in all | | directions. | 2 | Area between 3 feet and 5 feet | | of open end of vent, extending | | in all directions. Dispenser: | | Pits .................| 1 | Any pit, box or space below grade | | level, any part of which is | | within the Division 1 or 2 | | classified area. Dispenser enclosure ..| 1 | The area 4 feet vertically above | | base within the enclosure and | | 18 inches horizontally in all | | directions. Outdoor ..............| 2 | Up to 18 inches above grade level | | within 20 feet horizontally of | | any edge of enclosure. Indoor: | | With mechanical | | ventilation ........| 2 | Up to 18 inches above grade or | | floor level within 20 feet | | horizontally of any edge of | | enclosure. With gravity | | ventilation ........| 2 | Up to 18 inches above grade or | | floor level within 25 feet | | horizontally of any edge | | of enclosure. Remote pump - Outdoor.| 1 | Any pit, box or space below grade | | level if any part is within a | | horizontal distance of 10 feet | | from any edge of the pump. | 2 | Within 3 feet of any edge of the | | pump, extending in all | | directions. Also up to 18 | | inches above grade level within | | 10 feet horizontally from any | | edge of the pump. Remote pump - Indoor .| 1 | Entire area within any pit. | 2 | Within 5 feet of any edg of pump, | | extending in all directions. | | Also up to 3 feet above floor | | or grade level within 25 feet | | horizontally from any edge of | | pump. Lubrication or | | service room .......| 1 | Entire area within any pit. | 2 | Area up to 18 inches above floor | | or grade level within entire | | lubrication room. Dispenser for | | Liquids with a | | flashpoint below | | 100 °F (37.8 °C)(1)...| 2 | Within 3 feet of any fill or | | dispensing point, extending in | | all directions. Special enclosure | | inside building per | 1 | Entire enclosure. 1910.106(f)(1)(ii). | | Sales, storage and | | rest rooms..........| (2) | If there is any opening to these | | rooms within the extent of a | | Division 1 area, the entire | | room shall be classified as | | Division 1. _______________________|________|________________________________________ Footnote (1) Category 1 or 2 flammable liquids, or for Category 3 flammable liquids with a flashpoint below 100 °F (37.8 °C). Footnote (2) Ordinary
"Electrical equipment" -
"Heating equipment" -
"Conformance." Heating equipment shall be installed as provided in paragraphs (g)(6)(ii) through (v) of this section.
"Application." Heating equipment may be installed in the conventional manner in an area except as provided in paragraph (g)(6)(iii), (iv), or (v) of this section.
"Special room." Heating equipment may be installed in a special room separated from an area classified by Table H-19 by walls having a fire resistance rating of at least 1 hour and without any openings in the walls within 8 feet of the floor into an area classified in Table H-19. This room shall not be used for combustible storage and all air for combustion purposes shall come from outside the building.
"Electric heat." Electrical heating equipment shall conform to paragraph (g)(5) of this section.
"Sources of ignition." In addition to the previous restrictions of this paragraph, the following shall apply: There shall be no smoking or open flames in the areas used for fueling, servicing fuel systems for internal combustion engines, receiving or dispensing of flammable liquids. Conspicuous and legible signs prohibiting smoking shall be posted within sight of the customer being served. The motors of all equipment being fueled shall be shut off during the fueling operation.
"Fire control." Each service station shall be provided with at least one fire extinguisher having a minimum approved classification of 6 B, C, located so that an extinguisher, will be within 75 feet of each pump, dispenser, underground fill pipe opening, and lubrication or service room.
"Processing plants" -
"Scope." This paragraph shall apply to those plants or buildings which contain chemical operations such as oxidation, reduction, halogenation, hydrogenation, alkylation, polymerization, and other chemical processes but shall not apply to chemical plants, refineries or distilleries.
"Classification." The location of each processing vessel shall be based upon its flammable liquid capacity.
"Processing building" -
"Liquid handling" -
"Piping, valves, and fittings."
"Fire control" -
"Portable extinguishers." Approved portable fire extinguishers of appropriate size, type, and number shall be provided.
"Other controls." Where the special hazards of operation or exposure indicate a need, the following fire control provision shall be provided.
"Alarm systems." An approved means for prompt notification of fire to those within the plant and any public fire department available shall be provided. It may be advisable to connect the plant system with the public system where public fire alarm system is available.
"Maintenance." All plant fire protection facilities shall be adequately maintained and periodically inspected and tested to make sure they are always in satisfactory operating condition and that they will serve their purpose in time of emergency.
"Sources of ignition" -
"Maintenance and repair."
"General." Maintenance and operating practices shall be in accordance with established procedures which will tend to control leakage and prevent the accidental escape of flammable liquids. Spills shall be cleaned up promptly.
"Access." Adequate aisles shall be maintained for unobstructed movement of personnel and so that fire protection equipment can be brought to bear on any part of the processing equipment.
"Waste and residues." Combustible waste material and residues in a building or operating area shall be kept to a minimum, stored in closed metal waste cans, and disposed of daily.
"Clear zone." Ground area around buildings and operating areas shall be kept free of tall grass, weeds, trash, or other combustible materials.
"Refineries, chemical plants, and distilleries" -
"Storage tanks." flammable liquids shall be stored in tanks, in containers, or in portable tanks. Tanks shall be installed in accordance with paragraph (b) of this section. Tanks for the storage of flammable liquids in tank farms and in locations other than process areas shall be located in accordance with paragraph (b)(2)(i) and (ii) of this section.
"Wharves." Wharves handling flammable liquids shall be in accordance with paragraph (f)(4) of this section.
"Fired and unfired pressure vessels" -
"Fired vessels." Fired pressure vessels shall be constructed in accordance with the Code for Fired Pressure Vessels, Section I of the ASME Boiler and Pressure Vessel Code - 1968.
"Location of process units." Process units shall be located so that they are accessible from at least one side for the purpose of fire control.
"Fire control" -
"Portable equipment." Portable fire extinguishment and control equipment shall be provided in such quantities and types as are needed for the special hazards of operation and storage.
"Water supply." Water shall be available in volume and at adequate pressure to supply water hose streams, foam producing equipment, automatic sprinklers, or water spray systems as the need is indicated by the special hazards of operation and storage.
"Special equipment." Special extinguishing equipment such as that utilizing foam, inert gas, or dry chemical shall be provided as the need is indicated by the special hazards of operation and storage.
[39 FR 23502, June 27, 1974, as amended at 40 FR 3982, Jan. 27, 1975; 40 FR 23743, June 2, 1975; 43 FR 49746, Oct. 24, 1978; 43 FR 51759, Nov. 7, 1978; 47 FR 39164, Sept. 7, 1982; 51 FR 34560, Sept. 29, 1986; 53 FR 12121, Apr. 12, 1988; 55 FR 32015, Aug. 6, 1990; 61 FR 9227, March 7, 1996; 70 FR 53929, Sept. 13, 2005; 77 FR 17766, March 26, 2012; 81 FR 10490-10491, March 1, 2016]