Composite steel-plastic pressure pipe for conveying hot water

Abstract

The invention discloses a composite steel-plastic pressure pipe for conveying hot water. The composite steel-plastic pressure pipe for conveying hot water comprises an outer polyethylene layer, a stainless steel pipe layer and an inner polyethylene layer sequentially from outside to inside, the outer polyethylene layer and the stainless steel pipe layer are adhered through an outer adhesive layer, and the stainless steel pipe layer and the inner polyethylene layer are adhered through an inner adhesive layer. The composite steel-plastic pressure pipe has the advantages that stainless steel pipes substitute for traditional electro-galvanized steel tapes or electrolytic tinning steel tapes to serve as the middle layer of the composite steel-plastic pressure pipe, and stainless steel pipes are resistant to oxidation, so that oxidation and corrosion of the middle steel tape layer caused by oxygen permeation of the inner polyethylene layer can be prevented, and the service life of the composite steel-plastic pressure pipe can be prolonged; and the composite steel-plastic pressure pipe can be used for conveying hot water at the temperature higher than 70 DEG C and is applicable to the technical field of concentrated heating of buildings or chemical conveying of hot water.

Description

technical field [0001] The invention relates to the technical field of production and manufacture of steel-plastic composite pressure pipes. Background technique [0002] The steel-plastic composite pressure pipe industry is a new industry that has just developed in recent years. The inner and outer layers of the pipe are all polyethylene plastic layers, and the middle layer is argon arc butt welded steel pipe. The steel pipe and plastic are bonded with adhesive , a total of five floors from inside to outside. The pipe not only inherits the advantages of metal pipes and plastic pipes, but also overcomes their respective shortcomings. It is a new type of pipe integrating the advantages of metal pipes and plastic pipes. The steel-plastic composite pressure pipe has the following advantages: [0003] (1) It has high strength, rigidity and impact resistance that exceed the strength of plastic pipes, and has low expansion coefficient and creep resistance similar to steel pipes. ...

AI Technical Summary

Problems solved by technology

[0011] Steel-plastic composite pressure pipes can be used in the field of hot water, but due to the poor oxygen resistance of polyethylene, when used as a hot water pipe, the inner polyethylene plastic layer permeates oxygen. After a period of use, the middle electrogalvanized The steel strip or electro-tinned steel strip layer will be gradually oxidized and cause rust, which will lead to the failure of the bonding between the inner and outer layers, the service life of the pipe is short, and the working temperature is only 70°C

The above reasons limit the application of steel-plastic composite pressure pipes as hot water delivery pipes, but the market demand for hot water delivery pipes is large, so steel-plastic composite pressure pipes can only be selected as delivery pipes. In order to ensure the quality of hot water delivery, extend the The service life of the steel-plastic composite pressure pipe urgently needs a new steel-plastic composite pressure pipe that is not easy to rust

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