Method for inner-lining glass for steel tube

Abstract

The invention discloses a method for arranging glass lining in a steel pipe. The method comprises the steps as follows: a glass pipe is arranged in the steel pipe, and a high frequency induction heater is arranged in the glass pipe. The high frequency induction heater firstly heats the glass pipe heat radiation above 650 DEG C and the steel pipe heats through the glass pipe radian heat and the high frequency induction heater to ensure that the temperature in the surface of the steel pipe reaches 680 to 700 DEG C and the temperature outside the surface of the steel pipe is below 300DEG C. Simultaneously, the steel pipe moves forwards corresponding to the high frequency induction heater with relative moving speed of 300 to 400mm / min and then the compressed air with the pressure of 0.1 to 0.3 MPa passes through the breather pipe to attach the emollient glass pipe at the wall of the steel pipe. The method can control the heating layer of the inner surface of the steel pipe to be very thin, ensure the steel pipe under the smallest heat impact, maintain the strength of the steel pipe under the supply state, improve the processing speed and reduce the production cost.

Description

technical field [0001] The invention relates to a method for lining a steel pipe with glass. Background technique [0002] Petroleum pipelines can be divided into surface oil pipelines and downhole oil production pipelines. Corrosion, wax deposition and eccentric wear (wear) are the most common things in the actual use of petroleum pipelines. Currently, commonly used anti-corrosion technologies include Ni-P plating technology, Nitriding technology, titanium nano-polymer paint coating technology, FRP pipeline anti-corrosion technology, and the introduction of the American Saike-54 coating technology, etc., all have some disadvantages after being applied to oil pipelines, and no single process can meet the requirements at the same time. Anti-corrosion, anti-waxing and anti-eccentric wear performance requirements, and each has fatal defects, such as the environmental pollution problem of Ni-P plating and the problem of coating voids, the embrittlement of pipe thread caused by n...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to solve the problem that in the application number 200510046023.7 and titled "A Seamless Lined Glass Steel Pipe and Its Assembly Method", the steel pipe and the glass pipe are heated in a heating furnace at 680°C for nearly 2.5 hours as a whole at the same time. If the phase transition temperature of the steel is not reached, phase transition strengthening will not occur in the subsequent cooling process, and the strength of the steel pipe cannot be recovered after the reduction, resulting in damage to the strength of the steel pipe and affecting the service life of the pipe fittings. The method of lining the steel pipe with glass with the above-mentioned disadvantages is mainly to locally heat the inside of the glass pipe with an electric heating body. When the softening temperature of the glass is reached, pressure is applied to expand the glass on the inner wall of the steel pipe. The whole pipe is lined with glass by heating. The relative movement between the body and the pipe fittings is realized. During the process of lining the steel pipe with glass, the heating temperature is very low and the heating time is very short, so the strength of the steel pipe will not be damaged by the glass lining.

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