For standard pipe, except as provided for thin-wall pipe, the tolerances of diameter shall be in accordance with the following table:For pipe over 10 inch as special OD tolerance pipe, the OD shall within vary +1% /-1%. NPS/ DN/ OD. Permissible Variations in Outside Diameter. Over. China Erw Pipe manufacturer, Spiral Welded Pipe, line pipe Nov 24, 2011 · MCC Liaoning Dragon Pipe Industries Co., Ltd. is sponsored by MCC Group which is China s biggest Metallurgical Construction Corporation, operates a modern and world class large diameter electric resistance welding steel pipe mill line supplied by MILLTECH from Korea with advanced equipment and automatic control system integrating with Austrian LINSINGER S Edge Miller & Milling Cut
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