FIELD: pipe line transport, mains and oil, gas and water transfer lines. SUBSTANCE: main consists of at least two coaxial fastened together cylindrical layer made from high- strength tight material and formed from plain-walled high- strength double pipes which are fastened together by means of high-strength adhesive material. EFFECT: low cost; reduced labor consumption; improved technical characteristics. 21 cl, 7 dwg
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Authors
Dates
2002-06-20—Published
2001-01-05—Filed