Method for acquiring in-service high-temperature pipeline small punch samples

Abstract

The embodiment of the invention discloses a method for acquiring in-service high-temperature pipeline small punch samples. The method comprises the following steps: 1) determining diameters of the small punch samples, and selecting hollow drill bits of corresponding diameters; 2) determining lengths of the small punch samples; 3) drilling on the pipeline by adopting a magnetic drilling machine, and stopping drilling while reaching the lengths of the small punch samples, so that to-be-cut small punch samples appear; 4) brushing the samples with insulating paint, enabling the roots of the to-be-cut small punch samples to be filled with electric spark cutting fluid, and cutting the sample roots by adopting a portable electric spark machine and an L-shaped tungsten steel electrode until the small punch samples can be taken down; and 5) tapping on an in-service pipeline, forming a thread, filling and fixedly welding by adopting bolts of the same material. According to the method disclosed by the invention, the requirements on the small punch samples can be met, the condition that expensive and internationally common electric spark sampling device is purchased for sampling can be avoided, and the sampling cost is reduced.

Description

technical field [0001] The invention relates to the technical field of small-punch testing, and more specifically, relates to a method for obtaining a small-punch sample of an in-service high-temperature and high-pressure pipeline. Background technique [0002] There are a large number of pressure-bearing equipment such as boilers, pressure vessels and pressure pipelines in service in the electricity, nuclear power, petrochemical and metallurgical industries. Equipment materials will be damaged and degraded to varying degrees after long-term service at high temperatures or neutron irradiation. How to detect, evaluate the condition of materials and predict the remaining life has always been a hot issue in the industry. The traditional conventional test method can only cut off the pipeline to take samples, and then test and evaluate the various properties of the material. This method has obvious damage and damage to the original equipment structure, which is not economical, bu...

AI Technical Summary

Problems solved by technology

At present, the sampling of the small punch test mainly focuses on EDM sampling, but the sampling equipment is monopolized abroad, and the price is more than 9 million yuan, and the consumables for each sampling are also the same, which seriously affects the popularization and promotion of this new type of experiment.

Images