Energy-gathered cutting device for all-size gas blasting test of gas transmission steel pipe

Abstract

The invention discloses an energy-gathered cutting device for an all-size gas blasting test of a gas transmission steel pipe. The device comprises a shell; a conical medicine-shaped cover is arranged at the bottom of the shell; an inner cavity encircled by the shell and the medicine-shaped cover is an explosive bin for placing explosives; the section of the explosive bin is reversely V-shaped; the wall thickness of the medicine-shaped cover is smaller than the wall thickness of the shell; the taper angle of the top end of the medicine-shaped cover is 40-110 degrees; an electric detonator for blasting is mounted in the center of the upper side of the shell, and is remotely controlled to detonate; and the shell is mounted on a cut object through a clamp. The device is mounted on a crack initiation steel pipe; and the electric detonator is remotely controlled to detonate by a wire detonating mode. The energy-gathered cutting device is better in safety and higher in cutting efficiency. The energy-gathered cutting device is suitable for X80-X100 pipeline steel with a thickness of 16.3 mm, and guarantees to introduce a penetration type initial crack with a length of 500 mm in the center part of the upper side of the crack initiation steel pipe in the all-size gas blasting test. The tip of the introduced penetration type initial crack is sharp; the crack is narrower; and the width is not more than 10 mm.

Description

【Technical field】 [0001] The invention belongs to the field of explosive cutting, and relates to a device for cutting gas transmission steel pipes, in particular to an energy-gathering cutting device for full-scale gas explosion tests of gas transmission steel pipes. 【Background technique】 [0002] Natural gas is a kind of clean energy, but also a flammable and explosive dangerous medium. Once the high-pressure natural gas pipeline cracks for a long time, it will cause huge disasters and losses. Therefore, the safety of the pipeline must be guaranteed. In order to improve the economy of pipeline transportation, the development trend of natural gas pipelines is high pressure, large diameter, large wall thickness, and large transmission capacity, and the steel pipes used are also developing in the direction of high steel grade (high strength grade). Pipeline steel pipes for natural gas pipelines have developed very rapidly in recent years. X70-grade steel pipes have been succe...

AI Technical Summary

Problems solved by technology

However, for modern high-strength and high-toughness pipeline steel pipes (X80 and above), the existing crack arrest prediction methods have limitations and cannot correctly reflect the crack arrest performance of this high-strength and toughness material. The most reliable method for fracture toughness

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