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Casing Steel Grades

Casing Steel Grades There are twenty different steel grades for oil and casing pipes, namely H40, J55, K55, M65, N80, L80, C90, T95, C95, P110, Q125. Different color codes and symbols are used to distinguish various

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The History of Oil Pipelines

The History of Oil Pipelines Since the late 19th century, after the British inventor Walker created concrete pipes, the pipeline industry began to develop, with oil pipelines standing out among them. Oil pipelines are a means

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