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 8 - Points of Operation and Other Hazardous Parts of Machinery
Article 67 - Laundry and Dry Cleaning Equipment
Section 4493 - Boilers and Pressure Vessels
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Boilers and pressure vessels shall comply with the Boiler and Fired Pressure Vessel Safety Orders and the Unfired Pressure Vessel Safety Orders.
(b) Where pressure-reducing valves are used, a safety relief valve shall be provided on the low-pressure side of the reducing valve to prevent pressure build-up in excess of the maximum allowable working pressure. The safety relief valve shall be located as close as possible to the reducing valve, and it shall be vented to the atmosphere in a manner to avoid injury or damage caused by escaping fluid. The relief valve and vent system discharge capacity shall be sized so that the pressure rating of the low-pressure piping and equipment are not exceeded if the reducing valve sticks or fails to close.
NOTE: The relief valve may be omitted if the pressure before the reducing valve does not exceed the maximum working pressure of the equipment.
1. New
Sections 4493 and
4494 filed 9-19-75; effective
thirtieth day thereafter (Register 75, No. 38).
2. Amendment filed
11-2-86; effective thirtieth day thereafter (Register 86, No.
47).
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
