Device and method for testing external pressure crushing resistance of pipe

Abstract

The invention discloses a device and method for testing external pressure crushing resistance of a pipe. The device comprises a testing chamber, a pressure capsule, a constant temperature device, a pressurization device, a monitoring device, a sample and a sample clamp, wherein the testing chamber is a hollow tube of which two ends are opened; a circle of pressure capsule is arranged along the inner wall of the testing chamber; a strip-shaped space is formed in the middle of the pressure capsule; the sample is arranged in the strip-shaped space; the sample clamp is arranged at two ends of thesample; the constant temperature device is connected with the sample clamp; the pressurization device is connected with the pressure capsules; the monitoring device is connected with the sample clamp.The testing device disclosed by the invention is simple, reliable and high in safety, any complicated sealing device is not needed, and high-pressure fluid is always positioned in a limited state. The testing site is neat, and any auxiliary drainage system is not needed.

Description

technical field [0001] The invention belongs to the field of pressure testing, in particular to a testing device and method for testing the anti-collapse performance of pipes under external pressure. Background technique [0002] Non-metallic pipes have become one of the important solutions for anti-corrosion of oilfield surface gathering and transportation pipeline networks, and have been widely used in oil production, gas production, gathering and transportation, water injection and other projects. At present, the largest amount of oil field gathering and transportation pipelines are: glass steel pipes, plastic alloy composite pipes, steel skeleton composite pipes and flexible composite pipes. Although non-metallic pipes have many advantages, the external pressure resistance of non-metallic pipes is significantly lower than that of metal pipes due to the low strength of the matrix polymer material and the design of the reinforced structure to bear internal pressure. In or...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the loading method and the state of the sample simulate the actual situation, but its disadvantage is that the test chamber requires a complex sealing design (especially when the sample length is large, it is necessary to adopt a test chamber structure with open ends time); the test part of the sample is immersed in the pressurized liquid (water), which makes it very difficult to measure the strain (strain gauge) on the outer wall of the sample; during the test, if the test chamber is not well sealed or the cavity fails, the test chamber The high-pressure water splashing may cause accidents; after the test, the water in the test chamber will flow in the test area when the sample is removed, causing the site to be untidy and may cause electrical short circuits, and auxiliary drainage facilities are needed

Images