Self-tightening sealing pressure test tool for high-pressure steel tube

Abstract

The invention relates to a self-tightening sealing pressure test tool for a high-pressure steel tube, which comprises a hollow draw bar, wherein one end of the hollow draw bar is provided with a water injection channel, the other end of the hollow draw bar is communicated with a tube cavity of the high-pressure steel tube, and a nut, an ejection block, a first sealing assembly, a second sealing assembly and a gland are arranged outside the hollow draw bar in sequence; and the nut is in screwed connection with the hollow draw bar, the inner end surface of the nut butts against the outer end surface of the ejection block, the outer circumference side of the inner end surface of the ejection block butts against the end surface of a tube head of the high-pressure steel tube, the inner circumference side of the inner end surface of the ejection block butts against one end of the first sealing assembly, the other end of the first sealing assembly butts against one end of the second sealing assembly, the other end of the second sealing assembly butts against one end surface of the gland, and the other end surface of the gland butts against the hollow draw bar. When being used, the test tool is clamped in the tube cavity of the high-pressure steel tube and locked, and the self-tightening sealing pressure test tool is tightly sealed due to additional arrangement of the first sealing assembly and the second sealing assembly. Compared with the prior art, the self-tightening sealing pressure test tool disclosed by the invention has the characteristics of good sealing effect, simple structure, convenience for manufacturing and operation and convenience for assembly and disassembly.

Description

technical field [0001] The invention relates to a high-pressure steel pipe pressure test tool in the field of petrochemical equipment, in particular to a self-tightening sealing pressure test tool for a high-pressure steel pipe. Background technique [0002] Pressure test is the most effective means to retest raw materials and test equipment manufacturing quality of petrochemical equipment, and it is also the most important method to test the pressure bearing capacity of equipment. Steel pipe is one of the most important components connecting high-pressure petrochemical equipment with other equipment. The pressure test of the steel pipe in high-pressure petrochemical equipment is to use tooling to seal the end of the steel pipe, inject water into the steel pipe, pressurize and maintain the pressure, and check whether the equipment has obvious deformation and leakage. [0003] So far, there are mainly three types of pressure test equipment for domestic high-pressure steel pi...

AI Technical Summary

Problems solved by technology

Among them, the pipe end clamping type: the tooling is complicated and the labor efficiency is low; for the slender steel pipe, under the action of the clamping force, the steel pipe is axially stressed, prone to instability, bending and breaking, and the sealing performance is poor. For steel pipes with an experimental pressure greater than 10MPa, leakage is likely to occur and the pressure cannot be maintained

Welding blind plate type: when welding the blind plate at the end of the steel pipe, there will be a heat-affected zone, so it is necessary to reserve a certain length when purchasing the pipe, and cut off the excess length of the pipe after the hydraulic test is over, which is waste Materials, time-consuming and labor-intensive; external welding clamping type: complex tooling, waste of materials, low labor efficiency, low reuse rate, welding affects the performance of steel pipes

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