Polyurethane direct buried insulating pipes are suitable for insulating and cooling engineering of various media in the range of - 50 ~150 ~C. It is widely used in urban central heating, heating room, cold storage, coal mine, petroleum port, chemical industry and other industries.
Three-layer structure of polyurethane direct-buried insulating pipe from inside to outside
First layer: According to the design and customer's request, the polyurethane foamed insulating steel pipe working steel pipe layer generally chooses seamless pipe (GB8163-87), spiral welded pipe (GB9711-88; SY/T5038-92) and straight welded pipe (GB3092-93). After treatment by advanced shot peening rust removal process, the steel tube rust removal grade can reach Sa2 level in GB8923-1988 specification, and the surface roughness can reach R=12.5 micron in GB6060.5-88 specification.
Layer 2: Polyurethane foamed insulating steel pipe polyurethane insulating layer is made by one-time injection of rigid polyurethane foam plastics into the cavity formed between the steel pipe and the outer protective layer by high-pressure foaming machine. That is commonly known as "tube-in-tube foaming process". Its function is waterproof, heat preservation and self-weight support of heat network. The rigid polyurethane foam is chosen as insulation layer when the temperature of delivery medium is -50 ~120 ~C.
The third layer: polyurethane foamed insulating steel pipe high density polyethylene maintenance layer is prefabricated into a certain thickness of black (yellow) plastic pipe, its role is to maintain polyurethane insulation layer from mechanical hard damage.
The second is anti-corrosion and waterproof.
Polyurethane foam insulation pipe polyurethane foam can stop adhesion with all kinds of data. Therefore, as the insulation layer of directly buried pipe, there is no need to think about the problem of adhesion between anticorrosive coating. The compliance temperature of polyurethane insulation layer is + 120 C - 196 C, and can reach + 190 C in a short time (more than ten hours). If the user needs a long-term temperature of 190 degrees, we can use high-temperature materials to shape according to the user's needs.
Insulation pipes are widely used in liquid and gas pipeline network, chemical pipeline thermal insulation engineering petroleum, chemical industry, central heating network, central air conditioning ventilation pipeline, municipal engineering, etc. The high temperature prefabricated direct-buried insulating pipe is a kind of direct-buried prefabricated insulating pipe with good thermal insulation performance, safety and reliability, and low cost. The problems of heat preservation, smooth sliding and waterproofing of exposed pipe ends of prefabricated directly buried insulating pipes for heat transfer at 130-600 (?) C in urban central heating are effectively solved. High temperature prefabricated directly buried insulation pipe not only has advanced technology and applicability which is difficult to compare with traditional trench and overhead pipeline laying, but also has remarkable social and economic benefits. It is also a powerful measure of heating energy saving. High temperature prefabricated directly buried insulating pipes adopt directly buried heating pipe technology, which indicates that the development of heating pipe technology in China has entered a new starting point.
The insulating pipe is composed of steel pipe, FRP inner sheath and FRP outer shell. It is characterized by high temperature insulating layer, smooth layer and elastic seals. The new type of heat preservation pipe can effectively deal with the problems of heat preservation, smooth sliding and waterproofing of exposed pipe ends of prefabricated directly buried heat preservation pipes used for heat transmission at 130-600 C in urban central heating.
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