Civil Engineering Association

API Spec.4F-2008 Specification for Drilling and Well Servicing Structures

This specification states requirements and gives recommendations for suitable steel structures for drilling and
well-servicing operations in the petroleum industry, provides a uniform method of rating the structures, and
provides two PSLs.
This specification is applicable to all new designs of all steel derricks, masts, guyed masts, substructures, and
crown blocks.
Annex A provides a number of standard Supplementary Requirements (SRs) which apply only if specified by the
purchaser.

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