Spiral steel pipe with metal liner and heating and thermal functions and manufacturing method thereof

Abstract

The invention discloses a spiral steel pipe with a metal liner and heating and thermal functions. The spiral steel pipe comprises a pipe body; a plurality of metal steel bands are arranged on spirals of the inner wall of the pipe body at intervals; thermal insulating materials are paved among adjacent metal steel bands to form a thermal insulating layer, the metal steel bands and the thermal insulating layer cover the inner wall of the whole pipe body, and the eternal surface of the metal steel bands and the thermal insulating layer is also provided with a liner for preventing scouring and corrosion of a medium; a reinforcing ring spirally winds the outer wall of the pipe body, and a spiral hollow cavity is formed between the inner wall of the reinforcing ring and the outer wall of the pipe body and is internally provided with a heating device. By additionally arranging the thermal insulating layer and the heating device in the reinforcing ring, loss of heat of a transfer medium is effectively avoided, a function of heating the medium is realized, the anti-corrosion and wear resistance of the steel pipe are further improved due to the metal liner, and the integral intensity of the steel pipe is enhanced by additionally arranging the reinforcing ring, so that a pipe diameter is increased, the use amount of steel materials is greatly reduced under the same stress and environment, and cost is reduced.

Description

technical field [0001] The invention discloses a steel pipe and a manufacturing method thereof, in particular to a spiral steel pipe with a metal lining and functions of heating and heat preservation and a manufacturing method thereof. Background technique [0002] At present, in medium transportation and storage projects that require heat preservation or heating, commonly used pipes include cement pipes, plastic pipes, ordinary carbon steel pipes, stainless steel pipes, and galvanized steel pipes. Cement pipe is a kind of prefabricated pipe made of cement and steel bars and using the principle of centrifugal force, but it is easy to leak and has poor internal pressure resistance; and the diameter is not large, generally 3 meters or less; the length of each pipe is not large. Long, many joints, joints are easy to leak, and construction is difficult; the foundation must be made first during construction, the construction cost is high, it is difficult to achieve heat preservat...

AI Technical Summary

Problems solved by technology

Cement pipe is a kind of prefabricated pipe made of cement and steel bars and using the principle of centrifugal force, but it is easy to leak and has poor internal pressure resistance; and the diameter is not large, generally 3 meters or less; the length of each pipe is not large. Long, many joints, joints are easy to leak, and construction is difficult; the foundation must be made first during construction, the construction cost is high, it is difficult to achieve heat preservation, and it is not easy to heat the medium in the pipe

Plastic pipe is made of plastic resin as raw material, adding stabilizer and other additives, and extruding in the pipe making machine. It is light in weight; easy to process, but the caliber should not be too large; Abrasion, not high temperature resistance, its physical properties drop sharply when it exceeds 70 °; it is easy to age when transporting media with certain temperature requirements, resin materials undergo qualitative changes in high temperature environments, and uncertain elements will be added to the transport medium invisibly

Ordinary carbon steel pipe is a steel pipe made of carbon steel. The inner wall is not wear-resistant and corrosion-resistant. The diameter cannot be made too large, only about 2.5 meters. When the diameter is large, the wall thickness increases greatly and the cost is high. Some provinces in China have explicitly banned the use of ordinary carbon steel pipes in water supply projects

Stainless steel pipes are too expensive

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