California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 1 - Unfired Pressure Vessel Safety Orders › Appendix B

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
3301.1 Use of Compressed Air or
					 Gases.
(a) Compressed air and other compressed gases in excess of
					 10 pounds per square inch gauge shall not be used to blow dirt, chips, or dust
					 from clothing while it is being worn.
(b) Compressed air or gases shall not be used to empty
					 containers of liquids where the pressure can exceed the safe working pressure
					 of the container.
(c) The use of compressed air shall be so controlled, and
					 proper personal protective equipment or safeguards utilized, as to protect
					 against the possibility of eye or body injury to the operator or other
					 workers.
(d) Abrasive blast cleaning nozzles shall be equipped with
					 an operating valve which must be held open manually. A support shall be
					 provided on which the nozzle may be mounted when it is not in use.
(e) Compressed gases shall not be used to elevate or
					 otherwise transfer any hazardous substance from one container to another unless
					 the containers are designed to withstand, with a factor of safety of at least
					 four, the maximum possible pressure that may be applied.
NOTE: For further guidance in the utilization of compressed
					 gases in cylinders see Group 10; for portable tanks, rail tank cars, or motor
					 vehicle cargo tanks, see Compressed Gas Association Pamphlet P-1-1965.
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1 Reprint General Industry
					 Safety Order, Section
					 3301, Use of Compressed Air or
					 Gases, from the California Administrative Code, Title 8, Subchapter 7 (Register
					 75, No. 29).
3304.2 Miscellaneous Use of
					 Compressed Cylinder Gas.
(a) Employers shall not permit the use of compressed
					 cylinder gas for testing pressure vessels unless there is installed in the
					 compressed gas supply line or on the vessel being tested a pressure relief
					 device set to function at a pressure not to exceed the safe working pressure of
					 the vessel.
(b) Compressed gas shall never be used from a cylinder or
					 cylinder manifold where pressures dangerous to employees may develop unless an
					 accepted pressure regulating device is installed on the cylinder valve or
					 manifold. The term "accepted" here means that the pressure regulating device is
					 listed by Underwriters' Laboratories or some other recognized authority of
					 equivalent standing.
Note: Cylinder as used in this order means an Interstate
					 Commerce Commission compressed gas cylinder.
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2 Reprint General Industry
					 Safety Order, Section
					 3304, Miscellaneous Use of
					 Compressed Cylinder Gas, from the California Administrative Code, Title 8,
					 Subchapter 7 (Register 72, No. 23).
3312.3 Entering Combustion
					 Chambers, Flues, Boilers or Unfired Steam Pressure Vessels.
(a) Before employees are allowed to enter, through a
					 manhole, the shell or drum of a steam boiler or an unfired steam pressure
					 vessel for maintenance or repair, where such a boiler or pressure vessel is one
					 of a battery of two or more boilers or vessels or is connected to another
					 source of steam, the valves connecting to the steam header or other source of
					 steam shall be closed and effectively blinded or two valves shall be installed
					 with a bleeder between them and the valves shall be closed and bleeder open.
					 Blow down valves and other valves on lines through which harmful material might
					 accidentally flow back to the boiler or vessel shall be either sealed or closed
					 and locked and the key retained by the employee or his supervisor while the
					 employee is in the boiler or vessel. When lines are effectively blinded the
					 valves need not be locked or sealed.
(b) Employees shall not enter or be required to enter the
					 fire boxes, flues or combustion chambers of fired apparatus until:
(1) The pilot light, fuel and steam lines to burners
					 entering the fire box or combustion chamber have been blinded, disconnected or
					 effectively closed by the use of two block valves with an open bleeder between
					 them.
(2) All probability of ignition of any solid combustibles
					 in the fire box or combustion chamber has been removed.
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3 Reprint of General Industry
					 Safety Order, Section
					 3312, Entering Combustion Chambers,
					 Flues, Boilers or Unfired Steam Pressure Vessels, from the California
					 Administrative Code, Title 8, Subchapter 7 (Register 72, No. 23).
3518.4 Air Compressors.
(a) Air compressor discharge lines having a block valve
					 between the air receiver and compressor shall have a pressure relieving safety
					 device installed in the line between the compressor and block valve. The
					 pressure relieving safety device shall be set to open at a pressure not to
					 exceed the rated working pressure of the cylinder. The relieving capacity of
					 the pressure relieving safety device shall be such as to prevent a rise of
					 pressure in the compressor cylinder of more than 10 percent above its maximum
					 allowable working pressure, and the discharge shall be to a safe place.
The installation of this pressure relieving safety device
					 is not to be considered as providing the required safety relief valve for the
					 protection of the air receiver.
(b) Air compressor intake lines shall not be located in
					 atmospheres containing explosive concentrations of flammable gases or
					 vapors.
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4 Reprint of General Industry
					 Safety Order, Section
					 3518, Air Compressors, from the
					 California Administrative Code, Title 8, Subchapter 7 (Register 72, No.
					 23).
1. New
					 Appendix B (Sections
					 3301,
					 3304,
					 3312, and
					 3518) filed 12-14-76; effective
					 thirtieth day thereafter (Register 76, No. 51).
Note: Authority cited: Section
						142.3, Labor
						Code.