API RP 4G-2012 Operation@ Inspection@ Maintenance@ and Repair of Drilling and Well Servicing Structures (FOURTH EDITION; ERTA: September 2013; ADDENDUM 1@ AUGUST 2016)
Objective This document provides guidelines and establishes recommended procedures for inspection@ maintenance@ and repair of items for drilling and well servicing structures@ in order to maintain the serviceability of this equipment. The information in this document should be considered as supplemental to@ and not as a substitute for@ the manufacturer??s instructions and the recommendations in API 54. Structures Covered Items of drilling and well servicing structures covered by this document include: ?? masts/derricks and accessories; ?? substructures and accessories. NOTE 1 Crown block sheaves and bearings are covered under API 8B. NOTE 2 Offshore masts@ derricks@ substructures and accessories are not under the scope of this document relative to 6.2.4@ Category IV inspection requirements.