Russian standards PDF
Code of regulations on contstruction of trunk gas pipelines. Code of regulations on construction of a line part gas pipelines. Ballasting, maintenance of stability of gas pipelines on design marks
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Code of regulations on construction of gas pipelines. Construction of underwater crossings
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Code of regulations on construction of trunk gas pipelines. Construction of crossings under highways and railways
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Code of regulations on contstruction of trunk gas pipelines. Clearing of interior and test of gas pipelines
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Sanitary regulations for welding, weld deposition and metal cutting
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