HEAT INSULATED PIPE FOR TRANSPORTATION OF LIQUID AND GASEOUS SUBSTANCES Russian patent published in 2015 - IPC F16L9/14 F16L59/14 F16L57/04 

FIELD: heating.

SUBSTANCE: heat-insulated pipe for transportation of liquid and gaseous substances contains the working pipe with external anticorrosive coating and centralizers, heat insulation from combustible material with the fire-prevention insert and external shell. The fire-prevention insert has the length 3 m minimum, but no more than a half of the pipe length. The fire-prevention insert is located in the middle part of the pipe pre-cleaned from external anticorrosive coating. From end faces of the fire-prevention insert the sealing sleeves are located which isolate space with the fire-prevention insert along internal surface of external shell and along external surface of the working pipe. The fire-prevention insert can be made in the form of the connected semi-cylinders from non-flammable material. Semi-cylinders from non-flammable material can be fitted with labyrinth locks along the connection surface. The fire-prevention insert can be fitted with the heat reflecting external coating.

EFFECT: exception of possibility of fire propagation along the whole length of the heat-insulated pipe in case of ignition of its thermal insulation from combustible material.

5 cl, 2 dwg