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Subchapter 5. Electrical Safety Orders
Group 1. Low-Voltage Electrical Safety Orders
Article 59. Hazardous (Classified) Locations

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§2540.8. Bulk-Storage Plants.

(a) Definition. A bulk-storage plant is a location where gasoline or other volatile flammable liquids are stored in tanks having an aggregate capacity of one carload or more, and from which such products are distributed (usually by tank truck). This shall also include locations where volatile flammable liquids are loaded or unloaded from tanker ships.

(Title 24, Part 3, Sections 515-1)

(b) Hazardous Locations.

  (1) Pumps, Bleeders, Withdrawal Fittings, Meters and Similar Devices.  


  (A) Adequately ventilated indoor locations containing pumps, bleeders, withdrawal fittings, meters and similar devices that are located in pipe lines handling flammable liquids under pressure shall be classified as a Class I, Division 2 location with a 5-foot distance extending in all directions from the exterior surface of such devices. The Class I, Division 2 location shall also extend 25 feet horizontally from any surface of these devices and extend up to 3 feet above the floor or grade level.  


  (B) Inadequately ventilated indoor locations containing pumps, bleeders, withdrawal fittings, meters and similar devices that are located in pipe lines handling flammable liquids under pressure shall be classified as a Class I, Division 1 location within a 5-foot distance extending in all directions from the exterior surface of such devices. The Class I, Division 1 location shall also extend 25 feet horizontally from any surface of the devices and extend upward to 3 feet above floor or grade level.  


  (C) Outdoor locations containing pumps, bleeders, withdrawal fittings, meters, and similar devices that are located in pipe lines handling flammable liquids under pressure shall be classified as Class I, Division 2 locations within a 3- foot distance extending in all directions from the exterior surfaces of such devices. The Class I, Division 2 location shall also extend up to 18 inches above grade level within 10 feet horizontally from any surface of the devices.  


  (Title 24, Part 3, Section 515-2.)  


  (2) Transfer of Flammable Liquids to Individual Containers.  


  (A) In outdoor locations or wherever positive and reliable mechanical ventilation is provided in indoor locations in which flammable liquids are transferred to individual containers, such locations shall be classified as a Class I, Division 1 location within 3 feet of the vent or fill opening extending in all directions. A Class I, Division 2 location shall be within the space extending between 3-foot and 5-foot radius from the vent or fill opening extending in all directions, and including the area within a horizontal radius of 10 feet from the vent or fill opening and extending to a height of 18 inches above floor or grade levels.  


  (B) Indoor locations in which flammable liquids are transferred to containers and where positive and reliable mechanical ventilation is not provided shall be classified as Class I, Division 1 locations.  


  (Title 24, Part 3, Section 515-2.)  


  (3) Loading and Unloading of Tank Vehicles and Tank Cars in Outside Locations.  


  (A) The space extending 3 feet in all directions from the dome when loading through an open dome or from the vent when loading through a closed dome with atmospheric venting shall be classified as a Class I, Division 1 location.  


  (B) The space extending between a 3-foot and 15-foot radius from the dome when loading through an open dome or from the vent when loading through a closed dome with atmospheric venting shall be classified as a Class I, Division 2 location.  


  (C) The space extending within 3 feet in all directions from a fixed connection used in bottom loading or unloading, loading through a closed dome with atmospheric venting, or loading through a closed dome with a vapor recovery system, shall be classified as a Class I, Division 2 location. In the case of bottom loading or unloading, this classification shall also be applied to the area within a 10-foot radius from the point of connection and extending 18 inches above grade.  


  (Title 24, Part 3, Section 515-2.)  


  (4) Aboveground Tanks.  


  (A) The space above the roof and within the shell of a floating roof type tank shall be classified as a Class I, Division 1 location.  


  (B) For all types of aboveground tanks, the space within 10 feet from the shell, ends, and roof of other than a floating roof shall be classified as a Class I, Division 2 location. Where dikes are provided, the space inside the dike and extending upward to the top of the dike shall be classified as a Class I, Division 2 location.  


  (C) The space within 5 feet of a vent opening and extending in all directions shall be classified as a Class I, Division 1 location.  


  (D) The space between 5 and 10 feet of a vent opening and extending in all directions shall be classified as a Class I, Division 2 location.  


  (Title 24, Part 3, Section 515-2.)  


  (5) Pits.  


  (A) Any pit or depression, any part of which lies within a Division 1 or Division 2 location as defined herein, shall be classified as a Class I, Division 1 location unless provided with positive and reliable mechanical ventilation.  


  (B) Any such location that is provided with positive and reliable mechanical ventilation shall be classified as a Class I, Division 2 location.  


  (C) Any pit or depression not within a Division 1 or Division 2 location as defined herein, but that contains piping, valves, or fittings, shall be classified as a Class I, Division 2 location.  


  (Title 24, Part 3, Section 515-2.)  


  (6) Docks for Loading and Unloading of Tanker Ships. Docks used for loading and unloading of tanker ships shall conform to Figure 1, "Marine Terminal Handling Flammable Liquids".  


  (Title 24, Part 3, Section 515-1(a).)  


  (A) The interior of a building, any portion of which is located in such Class I, Division 2 locations shall also be classified as a Class I, Division 2 location.  


  Exception: Buildings which are provided with satisfactory positive ventilation, and safeguards, with air taken from a clean air source may be considered to be a nonhazardous location.  


  (B) All electrical power driven pumps and transfer apparatus for flammable liquids shall be provided with an identified 'STOP' or normal control switch readily accessible to the person operating the equipment.  


  (Title 24, Part 3, Section 515-(a).)  


  (7) Garages for Tank Vehicles. Storage and repair garages for tank vehicles shall be classified as a Class I, Division 2 location up to 18 inches above the floor or grade level.  


  Exception: Where conditions warrant, a more severe classification or greater extent of the hazardous location may be required.  


  (Title 24, Part 3, Section 515-2.)  


(c) Gasoline Dispensing. Where gasoline dispensing is carried on in conjunction with bulk station operations, the applicable provisions of Section 2540.8 shall apply.

(Title 24, Part 3, Section 515-7.)

FIGURE 1. MARINE TERMINAL HANDLING FLAMMABLE LIQUIDS

Notes:
  (1) The "source of vapor" shall be the operating envelope and stored postion of the outboard flange connection of the loading arm (or hose).  


  (2) The berth area adjacent to tanker and barge cargo tanks is to be Division 2 of the following extent:  


  a. 25 ft. (7.6 m) horizontally in all directions on the pier side from that portion of the hull containing cargo tanks.  


  b. From the water level to 25 ft. (7.6 m) above the cargo tanks at their highest position.  


  (3) Additional locations may have to be classified as required by the presence of other sources of flammable liquids on the berth, or by Coast Guard or other regulations.  


     Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(b), Health and Safety Code.  

 HISTORY 
   
1. Editorial correction of NOTE filed 11-2-83 (Register 83, No. 45).

2. Amendment filed 8-27-86; effective thirtieth day thereafter (Register 86,  No. 37).

3. Change without regulatory effect amending subsection (b)(6)(D) filed 7-9-92 pursuant to section 100, title 1, California Code of Regulations (Register 92, No. 28).

4. Amendment of subsections (a) and (b)(6), repealer of subsections (b)(6)(A) and (b)(6)(D), subsection relettering, new Figure 1, and amendment of Note filed 8-28-95; operative 9-27-95 (Register 95, No. 35).

5. Change without regulatory effect providing more legible illustration filed 11-6-2008 pursuant to section 100, title 1, California Code of Regulations  (Register 2008, No. 45).

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