Matching performance verification method of a ferrule joint and an instrument pipe for a nuclear power station

Abstract

The invention belongs to the field of test verification methods of mechanical connection, and particularly relates to a matching performance verification method of a ferrule joint and an instrument pipe for a nuclear power station. The method comprises the following steps that S1, selecting M groups of test pieces, wherein each group of test pieces comprises a first test piece, a second test piece, a third test piece, a fourth test piece and a fifth test piece, and each test piece is composed of a clamping sleeve connector and an instrument pipe; S2, performing an airtight test on the M groupsof test pieces; S3, performing a hydrostatic test on the M groups of test pieces; s4, performing a vibration test, a water pressure test and a bursting test on the first test piece; performing a tightening test and a hydrostatic test on the second test piece; performing pulse test, repeated assembly test and water pressure test on the third test piece; performing a bending fatigue test, a repeated assembly test and a hydrostatic test on the fourth test piece; performing a tensile test on the fifth test piece; S5, performing a limit assembly test and a hydrostatic test on the third test pieceand the fourth test piece; and if each test of the M groups of test pieces passes, the matching performance of the ferrule joint and the instrument pipe meets the application standard requirement of the nuclear power station.

Description

technical field [0001] The invention belongs to the field of test and verification methods for mechanical connections, and in particular relates to a method for verifying the matching performance of ferrule joints and instrument pipes used in nuclear power plants. Background technique [0002] The connection between the ferrule joint and the instrument pipe has occupied an increasingly dominant position in the instrument measurement pipeline of various industries. But how to ensure the matching performance of the two has become a difficult and key point. At present, there are no international and domestic design and manufacturing standards for ferrule joints used in nuclear power plants. , so the matching performance of the ferrule joint and the instrument pipe connection can only be verified by the test method. [0003] The American Society for Testing and Materials and mature tube fitting suppliers in the industry jointly compiled ASTMF1387-99 (2012) as a general inspect...

AI Technical Summary

Problems solved by technology

The national standard GB / T3765-2008 stipulates some inspection and test items applicable to ferrule joints, but the existing tests are not applicable to nuclear power projects, and the specified items are not complete and cannot cover various working conditions of nuclear power plants

[0004] Due to the above reasons, there is no systematic test method to follow for how to verify the matching performance of ferrule joints and instrument pipes used in nuclear power plants.

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