Device for measuring pipe ovality

Abstract

The invention belongs to the technical field of pipe production and laying installation and relates to a device for measuring pipe ovality. The device comprises a drawing board connected onto a drawing board column and an ovality measuring mechanism connected onto a measuring column. The drawing board column and the measuring column are vertically fixed. The ovality measuring mechanism comprises two vertical rods connected through a horizontal beam with a horizontal spring. The lower portion of the ovality measuring mechanism is connected onto the measuring column on the same side through an upper beam and a lower beam respectively. One end of the lower beam is vertically fixed on the measuring column on the same, a guide groove is axially arranged on the upper portion of the other end of the lower beam, and the lower ends of the vertical rods are installed in the guide groove through balls. The upper beam is provided with a demarcation spring, and the upper ends of the two vertical rods are respectively fixedly connected with a marking pen pointing to the drawing board. By means of the device, measurement workers can conveniently and directly read length of a long shaft and a short shaft on the section of a pipe, and simultaneously determines the position of endpoints of the long shaft. The device achieves quality checking of the large-diameter pipe.

Description

technical field [0001] The invention belongs to the technical field of pipeline production, laying and installation, and relates to a pipeline parameter measuring device, which can provide reference for predicting and controlling its working state after laying and operation. Background technique [0002] The submarine oil and gas pipeline is the lifeline project of the country, and its safety is of great importance to my country's offshore oil development and national economic development. However, the marine environmental conditions are complex and diverse. Submarine pipelines are subjected to complex loads and environmental conditions such as self-weight, external hydrostatic pressure, internal pressure, rough seabed, and seawater corrosion. Buckling and buckling propagation, once the submarine pipeline is buckled and damaged, it will lead to extremely serious oil and gas leakage accidents, which will cause huge economic, social, political and ecological losses to the coun...

AI Technical Summary

Problems solved by technology

Among them, the device for measuring the ovality of pipe fittings by laser method is relatively complicated and expensive, and it is not convenient for rapid measurement at the production or laying site

There are the following problems in the measurement of the device for measuring the ellipticity of pipe fittings by mechanical means: first, the human error factors of the result are difficult to control, such as CN 202158829 U "a portable steel pipe ellipticity measuring instrument" and CN 201780083 U "a kind of measuring steel pipe In the method described in "Measuring tools for extreme diameter and ellipticity", the measuring personnel are required to rotate the measuring device 360 ​​degrees along the outer wall of the pipe fitting. The 360-degree rotation of the restriction measuring device is not easy to realize; second, the determination of the extreme value of the major axis and the minor axis of the section is not accurate enough during the measurement process, such as CN 202158829 U "a portable steel pipe ellipticity measuring instrument" and CN 201449240 U "steel pipe In the method described in "Ovality and Curvature Detection Device", the measurement personnel need to manually determine the maximum and minimum values ​​of the indicated scale during the measurement process, and the measurement device cannot record the measurement data in real time, so the measurement accuracy is difficult to guarantee; Third, the inventors have not found a device that can measure the length of the major axis of the pipe and at the same time calibrate the position of its endpoint on the surface of the pipe wall, and the endpoints of the major and minor axes of the pipe section will gradually form plastic hinges during the local buckling of the pipe. Its location is extremely important for predicting and controlling the performance and reliability of deepwater subsea pipelines

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