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Subchapter 14. Petroleum Safety Orders--Drilling and Production
Article 19. All Derricks, Masts and Supporting Structures
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§6571. Crown Blocks.

(a) Each crown block sheave and crown block shall be securely fastened in place in a manner that will prevent it from jumping out of its bearings or becoming accidentally shifted or dislodged.

(b) Cast iron sheaves shall not be used in any crown block used for drilling or redrilling or remedial well servicing operations where rotary jars are used nor in any new crown block installed after the effective date of these orders.

Cast iron sheaves which were in use before the effective date of these orders may be used in routine well servicing operations.

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


1. Amendment filed 7-20-59; effective thirtieth day thereafter (Register 59, No. 12).

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

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