METHOD OF MANUFACTURING COMPOSITE HEAT-RESISTANT INSULATION OF PIPELINES Russian patent published in 2002 - IPC

FIELD: pipelines. SUBSTANCE: invention can be used at different methods of pipeline laying with temperature of pipe outer wall up to 150 C and for pipelines transporting cooling agents at temperature up to 200 C. In process of manufacturing after application of first silicon foamed concrete layer of internal insulation, pipe-blank is rotated and is displaced by means of reciprocating motion mechanism relative to actuating mechanism applying four polymer concrete intermediate layers of total thickness equal to 20% of thickness of said first silicon foamed concrete layer of insulation, i.e. shell, number of each pass of insulated pipe is measured and settings of proportioners of concrete and foamed polymer components of four intermediate polymer concrete layers for each pass of pipe in per cent are changed accordingly at measured numbers of passes: 80% of concrete component 20% of foamed polymer component for first pass of pipe; 60% of concrete component 40% of foamed polymer component for second pass of pipe: 40% of concrete component 60% of foamed polymer component for third pass of pipe and 20 of concrete component 80% of foamed polymer component for fourth pass of pipe. After forming intermediate layers with using process components by actuating mechanism, outer foamed polyurethane insulation is applied to intermediate layers. EFFECT: improved heat insulating properties and mechanical strength of composite heat-resistant insulation at reduction of heat losses. 1 dwg