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Subchapter 14. Petroleum Safety Orders--Drilling and Production
Article 35. Drilling and Well-Servicing Machinery and Equipment
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§6625. Emergency Stop Device.

(a) A readily accessible emergency stop device shall be provided for each prime mover for drilling and well servicing machinery. The controls for the device shall be painted red or otherwise made conspicuous. The device shall be one that, once placed in the stop position, must be manually reset to the starting or running position before the prime mover can be started.

(b) Stop devices for various types of prime movers shall be as follows:

(1) For an internal combustion gas engine, an ignition or grounding switch of a type which will not produce an arc or spark in open air.

(2) For a diesel engine, a quick closing valve or equivalent device that will shut off the air into the engine's air intake manifold, a means of releasing the engine compression, provided it is done in a manner that will not produce an open flame or spark or other safe means will be acceptable.

(3) For an electric motor, a switch or stop button in the control circuit shall be of an approved type for the location in which it is installed, in accordance with the Electrical Safety Orders, Article 56.

(c) The controls for such stop devices for the draw works prime movers shall be located at the driller's console.

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


1. Amendment of section and new Note filed 5-8-95; operative 6-7-95 (Register 95, No. 19).

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