Method for coating polyethylene isolation layer on inner walls of steel pipes for ship

A technology for polyethylene isolation layer and inner wall of steel pipe, which is applied in the direction of coating, liquid coating device on the surface, surface pretreatment, etc., to save investment, maintenance and replacement costs, prevent corrosion, and improve service life.

Active Publication Date: 2010-04-21
LIAONING BOHAI ANTI CORROSION ENG
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing steel pipe coating technology, the present invention proposes a method for coating the inner wall of a marine steel pipe with a polyethylene isolation layer

Method used

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  • Method for coating polyethylene isolation layer on inner walls of steel pipes for ship
  • Method for coating polyethylene isolation layer on inner walls of steel pipes for ship
  • Method for coating polyethylene isolation layer on inner walls of steel pipes for ship

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Embodiment Construction

[0017] The method of the invention is completed through the preheating and spraying process of the steel pipe.

[0018] 1. Steel pipe preheating

[0019] Steel pipe preheating is carried out using a preheating kiln.

[0020] The structure of the preheating kiln is: figure 1 As shown, a kiln body with a volume inner cavity space is used as a preheating kiln 1, a kiln door 1.1 is provided on one side of the kiln, a partition 1.2 is installed on the bottom side of the preheating kiln, and a row is arranged on the upper part of the preheating kiln. Air pipe 1.3, on which exhaust valve 1.4 is installed; a heating furnace 2 is installed on one side of the preheating kiln, and a heating furnace burner 2.1 is installed in it, and a heating medium cavity 2.2 is arranged on the upper part and the side part, and the upper part The working medium conduit 2.3 is connected with the heat exchanger 2.4 arranged in the preheating kiln; a fan 3 is installed on one side of the heat exchanger, ...

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Abstract

The invention relates to a method for coating a polyethylene isolation layer on the inner walls of steel pipes for a ship, which comprises the following steps of 1, preheating the steel pipes in a preheating kiln, wherein the temperature of the preheating kiln is controlled between 250 DEG C and 350 DEG C, a heat exchanger and a blower are arranged in the preheating kiln, the heat exchanger radiates heat to preheat the steel pipes; and 2, carrying out plastic coating on the steel pipes by using a plastic-coating machine, wherein the plastic coating machine can convey plastic powder to a centrifugal nozzle and throws plastic powder particles into the walls of the steel pipes by the action of rotating force; and the plastic powder particles are coated on the inner walls of the steel pipes and melted to form a film by residual temperature of the steel pipes. By adopting a method for centrally preheating the steel pipes and carrying out plastic coating one by one, a plastic isolation film is formed on the inner wall of each steel pipe, therefore, the invention is suitable for the anticorrosion of the steel pipes.

Description

technical field [0001] The invention relates to a method for coating the inner wall of a marine steel pipe with a polyethylene isolation layer in the fields of metal processing and material delivery. Background technique [0002] Marine steel pipes used to transport seawater are easily corroded by seawater, resulting in peeling, resulting in corrosion of the inner wall of the steel pipe and shortening the service life. [0003] In addition to transporting seawater, marine steel pipes are also used to transport other liquid or gaseous substances. Without an isolation layer, it is difficult to ensure the corrosion reaction between the transported material and the steel pipe, which not only causes corrosion of the inner wall of the steel pipe, but also causes chemical mixing of the transported material, destroying its purity. [0004] At present, the method to solve the corrosion of the inner wall of the marine steel pipe is to use special spraying equipment to spray plastic i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/22B05D3/02B05C19/04
Inventor 王震刘珠楠李宝东王宝山
Owner LIAONING BOHAI ANTI CORROSION ENG
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