FIELD: metallurgy.
SUBSTANCE: lined steel pipe intended for transfer of fluid comprises circular lining of concrete or mortar that makes pipe ID and metal shell enveloping said lining. Lining stays in direct contact with metal shell wall inner surface. Note here that said lining is prestressed by metal shell at initial state prior to putting said pipe in operation for transfer of fluid. After putting said pipe in operation for transfer of fluid lining prestressing at final state is in fact ruled out.
EFFECT: higher stiffness and corrosion resistance.
33 cl, 4 dwg
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