California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 7 - General Industry Safety Orders › Group 20 - Flammable Liquids, Gases and Vapors › Article 143 - Processing Plants › Section 5557 - Storage

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) The storage of
						flammable or combustible liquids in tanks shall be in accordance with the
						applicable provisions of Article 145, Tank Storage.
(b) Storage tanks inside of buildings shall
						be permitted only in areas at or above grade which have adequate drainage and
						are separated from the processing area by construction having a fire resistance
						rating of at least two hours. Day tanks, running tanks and surge tanks are
						permitted in process areas. Openings to other rooms or buildings shall be
						provided with noncombustible liquid-tight raised sills or ramps at least 4
						inches in height, or the floor in the storage area shall be at least 4 inches
						below the surrounding floor. Openings shall be provided with approved
						self-closing fire doors. The room shall be liquid-tight where the walls join
						the floor. (See Article 2 for exit requirements).
(c) The storage of flammable or combustible
						liquids in containers shall be in accordance with the applicable provisions of
						Article 141, Container and Portable Tank Storage.
(d) Piping, valves and fittings shall be in
						accordance with Article 146, Piping, Valves and Fittings.
(e) Piping containing flammable or
						combustible liquids shall be identified. See Section
						3321.
(f) The transfer of large quantities of
						flammable or combustible liquids shall be through piping by means of pumps or
						water displacement. Except as required in process equipment, gravity flow shall
						not be used. The use of compressed air as a transferring medium shall be
						prohibited.
(g) Positive
						displacement pumps shall be provided with pressure relief discharging back to
						the tank or to pump suction.
(h)
						Equipment shall be designed and arranged to prevent the unintentional escape of
						liquids and vapors and to minimize the quantity escaping in the event of
						accidental release.
NOTE: Where the vapor space of equipment is usually
						  within the flammable range, the probability of explosion damage to the
						  equipment can be limited by inerting, by providing an explosion suppression
						  system, or by designing the equipment to contain the peak explosion pressure
						  which may be modified by explosion relief. Where the special hazards of
						  operation, sources of ignition, or exposures indicate a need, consideration
						  shall be given to providing protection by one or more of the above means. NFPA
						  69-2002, Standard on Explosion Prevention Systems, provides information on
						  inerting.
1.
						  Amendment filed 7-16-76; effective thirtieth day thereafter (Register 76, No.
						  29).
2. Editorial correction of subsection (h) (Register 2003, No.
						  30).
3. Change without regulatory effect amending subsection (h) and
						  adding NOTE filed 7-21-2003 pursuant to section
						  100, title 1, California Code of
						  Regulations (Register 2003, No. 30).
Note: Authority cited: Section
							 142.3, Labor
							 Code. Reference: Section
							 142.3, Labor
							 Code.