API 570 case studies
API 570 · Put your knowledge to work in context.
The API 570 Piping Inspector credential is one of the American Petroleum Institute's Individual Certification Programs (ICP). It is intended for inspectors and engineers who evaluate in-service process piping - the fixed piping systems found in refineries, petrochemical plants, tank farms and similar facilities - rather than newly fabricated pipe. The API 570 case studies are 5 cases and about 4,592 words.
1Setting the Next Interval on a Line With Only One Prior Survey
Sch 40 A106-B line (nominal wall 0.322 in.) carries diesel from a process unit to a tank farm. Minimum required thickness calculated to B31.3, including the corrosion allowance, is 0.220 in.
844 words, about 4 min2Localized Loss Downstream of a Wash-Water Injection Point
Sch 40 A106-B sour water line (nominal 0.280 in., t min 0.190 in.) runs from an overhead accumulator to a slop header at 150 psig and 130 F. Wash water is injected through a 1 in.
897 words, about 4 min3Folding Every Asset Into One Class and One Interval
A terminal inspector is handed a folder of assets and told to put them all into the API 570 piping program under a single Class 3 designation with one interval, to keep the inspection budget flat. The assets are: (1) a 12 in.
856 words, about 4 min4Corrosion Under Insulation on a Coastally Located Hot Line
carbon steel line (nominal 0.375 in., t min 0.200 in.) carries 340 F gas oil at 180 psig. It is insulated with calcium silicate and aluminum jacketing installed 12 years ago; tracer tubing runs under the jacketing along the top of the pipe.
944 words, about 5 min5An Unapproved Clamp, a Lost History, and a Permanent Repair Plan
Sch 40 A106-B line (nominal 0.237 in., t min 0.150 in.) carries light naphtha at 250 psig and 200 F. During a night shift, maintenance installs a bolt-on mechanical clamp over a pinhole leak at the 6 o'clock position and closes the work order as 'leak repair, complete'.
1,051 words, about 5 min