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Subchapter 15. Petroleum Safety Orders--Refining, Transportation and Handling
Article 21. Gas Compressors and Engines
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§6874. Stationary Internal Combustion Engines.

(a) Air and gas compressor engines of over 30 horsepower shall be provided with means other than manual for starting, provided, however, that manual starting may be used in emergencies.

(b) In addition to the throttle valve, other means shall be provided by the use of one or more valves, blinding, or other provisions giving equivalent safety, to prevent fuel gas entering cylinders and actuating moving parts while maintenance work is being performed upon an internal combustion engine, when such work would expose the employee to possible injury.

(c) The main fuel gas line to the gas compressor engines, and other internal combustion engines located in gas compressor buildings, shall be equipped with a suitable master shut-off valve located outside the building and shall be so identified.

(d) There shall be a check valve provided on the engine or in the air-starting line adjacent to each internal combustion engine cylinder using compressed air as a means of starting.

(e) The compressed air supply for starting an engine shall be prevented from so functioning while maintenance work is being performed which may endanger employees. This shall be accomplished by one of the following means:

(1) Disconnect and disalign the starting air line.

(2) Double-block and bleed the starting air line.

(3) Other means which give equally effective protection to employees.

(f) An effective overspeed device shall be installed and maintained in an operative condition on internal combustion engines driving gas compressors.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Amendment of section and new NOTE filed 9-6-94; operative 10-6-94 (Register 94, No. 36).

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