METHOD OF THERMALLY INSULATING STOP VALVES, AND THERMAL-INSULATION DEVICE

摘要

The invention relates to the field of pipeline construction and can be used in providing thermal insulation for the stop valves (flanges, gate valves, globe valves, etc.) of pre-insulated main pipelines and industrial pipelines intended primarily for transporting petroleum and petroleum products in difficult climatic conditions (sub-zero temperatures). A thermally-insulated duct for providing thermal insulation for a stop valve (gate valve) contains an outer protective cover made of galvanized steel with a thermally-insulating cladding on the inside surface of the cover, said cover being composed of sections which can be assembled and disassembled. The quantity and configuration of the sections is determined in accordance with the geometric parameters of the gate valve to be insulated. A portion of the sections is composed of two rigidly-interconnected segments of a cylinder which are oriented perpendicular to one another so that the sections can be mounted simultaneously on the gate valve and on a portion of the pipeline, adjacent to the gate valve, which has factory thermal-insulation, and is provided with reinforcing ribs in the area where the section segments are rigidly connected. The sections are provided with hermetically-sealing damping inserts made of foamed rubber (foam rubber), which provide for the hermetic seal of the duct during the repeated assembly and disassembly thereof, and with a lock mechanism. The thermally-insulating cladding is comprised of units (segments) made of foamed glass (foam glass), which are secured to the inside surface of the protective cover by means of a bitumen-based adhesive. A coating is applied to the surface of the foam glass units that comes into contact with the gate valve in order to protect the units against abrasion.