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Weierda is founded in 2005, with area over 50, 000 square meters, standard workshops around 25, 000 square meters, two sets of advanced production lines for coldâ??drawn seamless steel pipesï¼? one set of advanced hot rolled production line, and the necessary inspection & test devices for mechanical and chemical test Weierda has passed the certification of API 5CT & 5L, and well certified by all the necessary inspection standards of reputed inspection agencies, such as SGS, BV, Tuboscope, Intertek, Forenergy and etc.