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2017-1-16u2002·u2002FABRICATION, ERECTION AND INSTALLATION PROCEDURE FOR PIPING Revision No. ... API 5L Specification for Line pipes ASTM A53 Pipe, Steel, Black and Hot-Dipped, Zinc Coated, Welded ... 4.7.1 Shall be responsible for inspection on production of pipes,fittings and spools to ensure
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