Ice plug jacket device for inspection and maintenance operation of metal face seal joint

Abstract

The invention relates to an ice plug jacket device for inspection and maintenance operation of a metal face seal joint. The ice plug jacket device comprises a joint jacket, a butt joint jacket I and abutt joint jacket II, wherein the butt joint jacket I and the butt joint jacket II are connected to the two ends of the joint jacket correspondingly, the joint jacket wraps on the outer side of the metal face seal joint, and the butt joint jacket I and the butt joint jacket II wrap on the outer sides of corresponding pipelines correspondingly; a refrigerant is filled into internal cavities of thejoint jacket, the butt joint jacket I and of the butt joint jacket II, and each joint wrapped by each jacket or liquids in the pipelines are made into ice columns; the butt joint jacket I is providedwith a liquid nitrogen gasification discharge opening and an ultrasonic detection opening; and the butt joint jacket II is provided with a liquid nitrogen inlet, a compressed air inlet and an infrared temperature measuring detection opening. The ice plug jacket device can be applied to connecting pipelines with different specifications at the two ends of a VCR joint, and achieve remote monitoringand measuring, and quick unfreezing of an ice plug functions.

Description

technical field [0001] The invention belongs to a clamping device, in particular to an ice plug jacket device used for inspection and maintenance of metal surface sealing joints (such as VCR joints). Background technique [0002] In the heavy water tritium removal process combined with the electrolytic catalytic exchange system, the tritium-containing heavy water in the system pipeline is mainly composed of D 2 Composed of O and DTO, it has strong internal radiation. When the flowmeter, back valve, pulse damper, etc. installed on the pipeline between the two VCR joints fail and need to be replaced, the associated system must be evacuated and purged. During the continuous operation of the process system, due to the inability to drain and purge the medium in the system, it is impossible to replace the faulty flow meter and back pressure valve. Damaged equipment can only be replaced after the system has been drained and purged after parking, which will affect the continuous, ...

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Problems solved by technology

[0003] Patent application 200620116333.1 discloses a "square ice plug jacket", and patent application 201811589261.6 discloses a "nuclear power plant liquid nitrogen ice plug device and its ice plug control method". These existing ice plug jackets are only for round There is no ice plug jacket design specially designed for metal surface sealing joints and pipes of different specifications at both ends of the joint, and it does not have the functions of remote monitoring and quick thawing

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