Pressure measuring method for spiral welded steel pipe with reinforcing ring

Abstract

The invention discloses a pressure measuring method for a spiral welded steel pipe with a reinforcing ring, and the method comprises the following steps: first, blocking off both ends of the detected reinforcing ring of the spiral steel pipe; installing a pressure gage and a filler opening on the spiral steel pipe, and then connecting with the internal part of the detected reinforcing ring; filling liquid or gases into the filler opening to form certain pressure; stopping filling to observe whether the pressure on the pressure gage reduces, if the pressure reduces, then the welding is unqualified, and if the pressure does not reduce, then the welding quality is qualified. According to the pressure measuring method for spiral welded steel pipe with reinforcing ring, fluid or gas has no need to be filled with the whole pipe, thus the water consumption can be reduced; meanwhile the large scale equipment is not necessary, which simplifies the testing method; the time cost in filling substance is sharply reduced, which saves testing time and improves the production efficiency; the process is not restricted by any place, which is more suitable for pipeline inspection of big diameter pipes.

Description

technical field [0001] The invention discloses a pipeline pressure measurement method, in particular to a pressure measurement method of a spiral steel pipe with a reinforcing ring. Background technique [0002] At present, the pressure measurement method of spiral welded steel pipe is mainly clean water pressure test, the purpose of which is to test whether the spiral welded pipe penetrates and whether the weld can withstand the pressure without cracking. The specific method is to seal the end face of the spiral welded pipe, and The other end surface pours water into the pipe body and forms a certain water pressure. This test method requires very complicated instruments. Steel pipes with different diameters need to replace a set of plugging molds. For steel pipes with large diameters, in order to ensure the strength of the pressure measuring equipment, the volume of the equipment needs to be made very large. And this kind of test method is to fill the pipe body with water,...

AI Technical Summary

Problems solved by technology

This test method requires very complicated instruments. Steel pipes with different diameters need to replace a set of plugging molds. For steel pipes with large diameters, in order to ensure the strength of the pressure measuring equipment, the volume of the equipment needs to be made very large.

And this kind of test method is to fill the pipe body with water, and the pressure measurement of large-diameter steel pipes requires a lot of water, which is a serious waste of water resources.

Moreover, it will be very difficult to do this test for pipelines over 4 meters.

Images