External pressure type expansion joint with leakage monitoring function

Abstract

An external pressure type expansion joint with a leakage monitoring function comprises an external pressure type expansion joint and a leakage monitoring device. The leakage monitoring device comprises an outer side leakage detection assembly and a middle detection assembly. The outer side leakage detection assembly is composed of a first liquid detector attached to the inner wall of a pipe blank on the innermost layer of a corrugated pipe of the external pressure type expansion joint and a first sensor arranged outside the external pressure type expansion joint, and the first liquid detector is connected with the first sensor through a signal line. The middle detection assembly is composed of a second liquid detector and a second sensor arranged outside the external pressure type expansion joint, the second liquid detector is arranged between the innermost layer pipe blank and the secondary inner layer pipe blank of the corrugated pipe of the external pressure type expansion joint, and the second liquid detector is connected with the second sensor through a signal line. The corrosion rate of the corrugated pipe can be indirectly measured and calculated, economic losses caused by sudden failure accidents to use units are avoided, the long-period operation reliability and functional value of the corrugated pipe are improved, and long-period safe operation of a system pipe network is guaranteed.

Description

technical field [0001] The invention relates to the technical field of expansion joints, in particular to an external pressure expansion joint with a leakage monitoring function. Background technique [0002] According to statistics: Corrosion is the main cause of bellows expansion joint failure and damage, accounting for about 80% of the total failure types. Since the expansion joints in high temperature, high pressure and corrosive environments are mostly made of iron-nickel-based alloys and high-nickel alloys, pitting corrosion, stress corrosion, high-temperature oxidation and other corrosion damage are basically the main corrosion damage, and the corrosion cracks are concentrated in the places that are easy to accumulate. At the peak of the liquid, it is sudden and harmful. [0003] At present, the expansion joints used in petrochemical and coal chemical industries are generally of the internal pressure type. By adopting the concept of "single-layer pressure bearing, do...

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Problems solved by technology

None of the existing disclosed technologies or products involve the early warning function of leakage

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