FIELD: construction engineering. SUBSTANCE: combined pipe includes pipe proper, protective envelope and tips fitted at ends of pipes whose internal diameter is equal to external diameter of pipe. Pipe proper is made from high-strength cast iron with globular graphite. Trips are secured to pipe by weld seams. Protective envelope is made in form of foam polymer mineral coat applied on external surface in continuous layer with roll on tips. Thickness of foam polymer mineral coat exceeds thickness of pipe wall. Tips have cylindrical sections whose length exceeds thickness if pipe wall by more than twice. External diameter of cylindrical section of tip exceeds external diameter of pipe by at least three thicknesses of pipe wall. EFFECT: enhanced reliability; enhanced maintainability and corrosion resistance of pipe. 8 cl, 5 dwg
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