Helium mass spectrometer leak detection device for pipe-to-pipe butt welding line and leak detection method

Abstract

The invention discloses a helium mass spectrometer leak detection device for a pipe-to-pipe butt welding line. The device comprises a box body (1), a box body joint (5) and a helium mass spectrometer,wherein a through hole (101) is formed in the box body (1), the box body joint (5) is arranged on the box body (1) and is connected with the helium mass spectrometer, and the through hole is formed on the box body joint (5) so that the helium mass spectrometer communicates with the inner space of the box body (1). The helium mass spectrometer leak detection device for the pipe-to-pipe butt welding line has the advantages of being free from damaging pipes and welding lines, high in leak detection efficiency, low in cost, easy in manufacturing, high in reliability, and capable of determining leak point positions and the like.

Description

technical field [0001] The invention relates to a helium mass spectrometer leak detection device for pipe butt welds, in particular to a helium mass spectrometry leak detection device for nuclear island heat exchanger heat transfer pipe pipe butt welds, which belongs to the detection field. Background technique [0002] In the field of nuclear power equipment manufacturing, the heat transfer tube of the heat exchanger is the barrier between the radiative medium on the primary side and the secondary side. Once leakage occurs, it will cause great pollution to the secondary side. The tube-tube butt welds of the heat transfer tubes also have the above-mentioned leakage risk, so the requirements for the tightness of the tube-tube butt welds are very high. [0003] At present, the water pressure / air pressure test is generally used for the airtightness test of the butt weld seam of the pipe, but its efficiency is low, the cost is high, and the processing is complicated. [0004] H...

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Problems solved by technology

[0003] At present, the water pressure / air pressure test is generally used for the airtightness test of the butt weld of the pipe, but its efficiency is low, the cost is high, and the processing is complicated

[0004] Helium mass spectrometry leak detection is an economical and convenient detection method. If it can be applied to the detection of heat transfer tubes in heat exchangers, the detection cost will be greatly reduced. However, due to the functional limitations of helium mass spectrometry leak detection devices, it is currently not possible It can be used in the leak detection of pipe butt welding, especially it cannot be applied at the pipe butt weld of the heat transfer tube of the nuclear island heat exchanger. Vacuum is difficult to achieve; secondly, the space between the heat transfer tubes of the nuclear island heat exchanger is narrow, and there is not enough space to use a helium mass spectrometer leak detector

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