API Spec 4F:2008

API Spec 4F PDF

Covers the design, manufacture, and use of steel derricks, portable masts, crown block assemblies, and substructures suitable for drilling and well-servicing operations in the petroleum industry. It includes requirements for marking, inspection, a uniform method of rating, and design loading for the equipment. This document provides two product specification levels (PSLs) that define two levels of technical and quality requirements.