HEAT INSULATED PIPE Russian patent published in 2004 - IPC

FIELD: pipe and tube production. SUBSTANCE: invention relates to production of heat insulated pipes. According to invention, in heat insulated pipe including envelope, centralizers with centering members installed in ring clearance between envelope and pipe filled with heat-insulating material and ring stops installed on end faces, housing of centralizers are made in form of belt clamped to pipe by means of lock, with centering members of adjacent centralizers being arranged in staggered order, and their number and distance between adjacent centralizers being chosen to prevent crumpling of envelope by part of pipe mass per one centering member, and ring stops being made in form of truncated cone with outer and inner taper and pointed with larger bases in opposite sides. System: envelope, stop and pipe assembly forms sealed ring chamber and is filled up with air. To release excess pressure formed at heating of air in operation, ring chamber is furnished with compensation valve. EFFECT: improve reliability in operation, reduced cost of production. 3 cl, 6 dwg