Corrugated continuous reinforced plastics heat-preserving composite pipe

Abstract

The invention belongs to a corrugated continuously reinforced plastic insulation composite pipe. One or more layers of steel wires are knit on a transport layer 1 by a knitting machine to form a reinforced layer 2, a polyethylene protective layer 3 is clad outside the reinforced layer, the protective layer 3 is evenly coated with one layer of a thermoplastic elastomer solvent adhesive to form a bonding layer, and the bonding layer 4 is longitudinally and continuously coiled with a closed-cell foamed crosslinked polyethylene insulation layer 5 by a continuous insulation cladding machine; and a corrugated protective layer 6 is compounded by a corrugated pipe production line. The pipe designed by the invention is a continuous flexible pipe which has no weak point due to no joint; the insulation layer is made from the closed-cell foamed crosslinked polyethylene material, thus the pipe has good flexibility and strong memory, the pipe can spring back very well after compression deformation, and especially a corrugated structure is adopted for the protective layer, thus maximally improving the outer pressure resistance effect of the pipe, causing the pipe to have smaller bending radius and to more conveniently pass the bending; and a factory prefabrication manner is adopted for insulation, thus the construction is faster.

Description

technical field [0001] The invention belongs to a corrugated continuous reinforced plastic thermal insulation composite pipe. Background technique [0002] The freezing point of crude oil in the oilfield production base is around 38°C. The climate in the north is cold in winter, the soil water level is high, and the heat loss during oil transportation is serious. Therefore, the buried pipelines used in the field of oilfield gathering and transportation need to be insulated. In the past, the insulation of pipelines was connected by fixed-length insulation materials of 3 to 12 meters, and the outer layer was treated with waterproofing. The actual laying process was inefficient and there were many insulation pipe connections. Chinese patent "200710056113.3" discloses a continuous reinforced plastic insulation pipe for buried oil fields. Both the insulation layer and the protective layer adopt continuous production technology, which solves the disadvantages of many interfaces an...

AI Technical Summary

Problems solved by technology

In the past, the insulation of pipelines was connected by fixed-length insulation materials of 3 to 12 meters, and the outer layer was treated with waterproofing. The actual laying process was inefficient and there were many insulation pipe joints.

Chinese patent "200710056113.3" discloses a continuous reinforced plastic insulation pipe for buried oil fields. Both the insulation layer and the protective layer adopt continuous production technology, which solves the disadvantages of many interfaces and improves the insulation effect. However, due to the use of flexible insulation materials, the pipeline Unable to withstand too high hoop pressure, the protective layer is discounted and extruded the insulation material during transportation, and the soil hoop pressure compresses the insulation material after burial

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