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 26 - Driving and Pressurized Worksite Operations › Article 154 - Pressurized Worksite Operations › Section 6074 - Definitions

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
The following definitions shall apply in the
						  application of these Orders.
Air Lock (Personnel): A chamber through which employees
						  pass from one air pressure environment into another.
Bulkhead: An airtight structure separating the working
						  chamber from free air or from another chamber under a different pressure than
						  the working pressure.
Caisson: A wood, steel, concrete or reinforced air and
						  water-tight chamber in which it is possible for employees to work under air
						  pressure greater than atmospheric pressure.
Compressed Air Environment (Hyperbaric Condition): A
						  work site where the ambient pressure is greater than the atmospheric pressure
						  at the entrance to the work site.
Decanting (surface decompression): A method used for
						  decompressing under certain circumstances. In this procedure the workers are
						  brought to atmospheric pressure with a very high gas tension in the tissues and
						  then immediately re-compressed in a second and separate chamber or lock.
Division: The current Division of Occupational Safety
						  and Health, any predecessors, or any subsequent successor agency.
Emergency Locks: A lock designed to hold and permit the
						  quick passage of an entire shift of employees.
High Air: Air pressure used to supply power to
						  pneumatic tools and devices.
Low Air: Air supplied to pressurize working chambers
						  and locks.
Materials Lock: An air lock through which materials and
						  equipment pass from one air pressure environment into another.
Hyperbaric Chamber: A chamber in which employees are
						  treated for decompression sickness and/or air embolism. It may also be used in
						  pre-employment physical examinations to determine the adaptability of the
						  prospective employee to changes in pressure.
Pressure: A force acting on a unit area. Usually shown
						  as pounds per square inch (psi).
Absolute Pressure (psi): The sum of the atmospheric
						  pressure and gauge pressure (psig).
Ambient Pressure: Encompassing pressure surrounding all
						  sides.
Atmospheric Pressure: The pressure of air at sea level,
						  usually 14.7 psi (one atmosphere), or 0 Psig.
Gauge Pressure (psig): That pressure measured by a
						  gauge and indicating the pressure exceeding atmospheric.
Safety Screen: An air- and water-tight diaphragm placed
						  across the upper part of a compressed air tunnel between the face and bulkhead,
						  in order to prevent flooding the crown of the tunnel between the safety screen
						  and the bulkhead, thus providing a safe means of refuge and exit from a
						  flooding or flooded tunnel.
Special Decompression Chamber: A chamber to provide
						  greater comfort for employees when the total decompression time exceeds 75
						  minutes.
Supervising Physician: A physician licensed in the
						  State of California who is familiar with and experienced in the physical
						  requirements for the medical aspects of work in compressed air
						  environments.
Working Chamber: The space or compartment under air
						  pressure in which the work is being done.
1. New
						  section filed 4-4-2006; operative 5-4-2006 (Register 2006, No.
						  14).
2. Repealer of definition of "Normal Condition" and new
						  definition of "Supervising Physician" filed 3-10-2010; operative 4-9-2010
						  (Register 2010, No. 11).
Note: Authority cited: Section
							 142.3, Labor
							 Code. Reference: Section
							 142.3, Labor
							 Code.