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About This Item


Full Description

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.

Document History

  1. API Spec 4F

    Drilling and Well Servicing Structures, Fourth Edition

    • Most Recent
  2. API Spec 4F

    Drilling and Well Servicing Structures, Third Edition

    • Historical Version
  3. API 4F


    Specification for Drilling and Well Servicing Structures

    • Historical Version