FIELD: mechanical engineering. SUBSTANCE: pipe sections are laid along route. Pipe line is extended by pipe sections by welding their joints. Then lengths are laid in trench which is filled-in and pipe line is tested for strength and tightness. Tests are carried out by individual sections before laying them in trench. Tests of pipes for strength and tightness are conducted simultaneously with connecting next section. Sections under test are arranged lengthwise slightly overlapping each other. Length of section under test is no less than length of pipe section. EFFECT: enhanced reliability. 6 cl, 5 dwg
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