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Annex A (informative) External Inspection Checklist for Process Piping
FOURTH EDITION, NOVEMBER 2016
This recommended practice (RP) supplements API 570 by providing piping inspectors with information that
can improve skill and increase basic knowledge of inspection practices. This RP describes inspection
practices for piping, tubing, valves (other than control valves), and fittings used in petroleum refineries and
chemical plants. Common piping components, valve types, pipe joining methods, inspection planning
processes, inspection intervals and techniques, and types of records are described to aid the inspectors
in fulfilling their role implementing API 570. This publication does not cover inspection of specialty
items, including instrumentation, furnace tubulars, and control valves.