CASE STUDY TEMPLATE Operating Temperature Material Line Class 4,9 150 ANOMALY DESCRIPTION: ROOT CAUSES Underground piping was inspected and it was found that two valves in close proximity to each other had extensive corrosion on the body and bolting. The header piping is 2'' and branches out the valve to 3''. The remaining wall thicknesses of piping between the valves where also below thickness specification. Piping being underground and having damaged and missing paint coatings 3" 1 50 10 SA-333 Gr6 SERVICE: Line size Design Pressure Operating Presure Design Temperature CASE STUDY NUMBER: DESCRIPTION: CLIENT: Case Study 23 3" DOUBLE VALVE ENCLOSURE TENGIZCHEVROIL Compiled by: C Schimper Approved by: M Edwards Revision :A Document number: SD020 Effective date: 14/11/2016 1 PageCASE ST

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