Multi-layer composite lining pressing device of hydrogen embrittlement resistant austenitic stainless steel pipeline

By designing fixed flanges and rubber membrane assemblies, the problems of local wrinkling and interlayer displacement during the expansion of multi-layer composite linings in pipelines under water pressure were solved, achieving tight fit and efficient sealing, and improving pipeline forming quality and adaptability.

CN122275288APending Publication Date: 2026-06-26ZHEJIANG JNDIA PIPELINE IND
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Patent Information

Application Number
CN202610523633.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-20
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In the existing technology, multi-layer composite linings of pipelines are prone to local wrinkles, interlayer misalignment and radial bulging defects during water pressure expansion loading and unloading, resulting in poor adhesion between the composite lining and the outer pipe and reducing the quality of pipeline forming.

Method used

A fixed flange and rubber membrane assembly are used. The diameter of the fixed flange is smaller than the inner diameter of the composite liner. The rubber membrane expands and adheres to the inner wall to increase the contact area. A one-way component is used to control the water flow direction to prevent both radial and axial pressure. Metal ribs are combined to limit the expansion direction of the rubber membrane and ensure sealing.

Benefits of technology

It effectively prevents local wrinkles and interlayer misalignment of the composite lining, improves the pipe forming quality, enhances the adaptability and sealing of the device, avoids rubber membrane rupture and pipe deformation, and improves operational continuity.

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Abstract

The invention relates to the technical field of composite pipe forming, and discloses a multilayer composite lining pressing device for a hydrogen embrittlement-resistant austenitic stainless steel pipeline, which comprises a machine table, a plurality of supporting platforms are fixedly connected to the top of the machine table, two water injection bins are fixedly connected to the top of the machine table, and water flowing ports are formed in the sides, away from each other, of the two water injection bins; the diameter of the fixed flange is smaller than the inner diameter of the composite lining, and the thickness of the rubber film is also smaller than the diameter of the composite lining, so that the fixed flange does not make contact with the composite lining when entering and exiting from the pipeline, and the phenomenon that pipe openings in the two ends of the pipeline are blocked by a conventional circular-truncated-cone-shaped plug is effectively prevented. The problems that the composite lining layers on the two sides of the pipeline are extruded towards the middle portion along the axis of a pipe body by the circular-truncated-cone-shaped plugs, so that the composite lining in the middle section area of the pipeline has defects, the composite lining and the inner wall of an outer pipe are not tightly attached in the pressing forming process, and the overall forming quality of the pipeline is reduced are solved.
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