【History of Haichuan Pipes】20171101 CNPC Bohai Equipment – Production and export of welded pipes with a diameter of 3048 millimeters
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The steel pipe developed in this trial has a diameter of 3,048 millimeters and a wall thickness of 25.4 millimeters; it is made of Q235B material. This represents another breakthrough by Bohai Equipment Yangzhou Steel Pipe Company in the field of production technology for ultra-large diameter, thick-walled water transport pipes within CNPC.
【History of Haichuan Pipes】20211112 – Baoji Steel Pipe produced the largest-diameter steel pipe in use by China National Petroleum Corporation to date, with a diameter of 3448 millimeters. https://bbs.hcbbs.com/thread-3270234-1-1.html (Source: Haichuan Chemical Industry Forum)
It seems that two major steel pipe manufacturers in the oil industry
【History of Haichuan Pipes】The summary post is being updated continuously; learn about the development process of various pipes at https://bbs.hcbbs.com/thread-3068575-1-1.html (Source: Haichuan Chemical Forum)