Responding to the needs in petroleum and chemical industries, the Japan Welding Engineering Society (JWES) has been worked to establish a repair welding guideline on pressure equipment in refineries, petrochemical and other process industries. As accomplishments, JWES published Guideline for Repair Welding on Pressure Equipment in 2009. The paper describes Part 1 of the guideline which covers typical material degradations of the pressure vessels, equipment diagnosis and role of repair welding and standard repair welding procedures.

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