Covers the design, manufacture, and use of steel derricks, portable masts, crown block assemblies, and substructures suitable for drilling and servicing of wells. It includes stipulations for marking, inspection, standard ratings, design loading, and design specification of the equipment. Definitions of commonly used terms are included in Appendix A.
API 4F
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Specification for Drilling and Well Servicing Structures
American Petroleum Institute , 06/01/1995
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