Insulation explosion-proof bolt

Abstract

The invention relates to an oil-gas field pipe line auxiliary tool, in particular to an insulated explosion prevention bolt which can prevent pressure container explosion accident caused by electric welding and electrostatic fire striking during maintenance and construction in combustible and explosive area. The invention adopts the following technical proposal: the insulated explosion prevention bolt comprises a bolt, a fixing nut, a movable nut and a screw thread which are provided with insulating layers at the outer layer; moreover, the screw thread is acme thread. The insulated explosion prevention bolt has the advantages that: the bolt which is easy to operate prevents the occurrence of an explosion accident and reduces construction and stop production time; meanwhile, the bolt which is tested through twelve tests has stable performance, safety, quickness and reliability.

Description

1. Technical field: [0001] The invention relates to an auxiliary tool for oil and gas field pipelines, in particular to an insulating explosion-proof bolt for preventing explosion accidents of pressure vessels caused by electric welding and static ignition during maintenance and construction in inflammable and explosive places. 2. Background technology: [0002] The oil and gas pipeline process consists of metal pipelines, various valves, separation and metering devices, heating devices, and pressure vessels. Pipeline perforation and welding joint leakage may occur due to the influence of equipment itself, process transformation, and human sabotage factors during production and operation. During maintenance, the process must be in a state of shutdown and pressure relief. Explosive oil and gas mixture, at this time using electric welding maintenance, especially when the construction is near the pressure vessel, there will be static sparks, which can easily cause the pressure ...

AI Technical Summary

Problems solved by technology

Pipeline perforation and welding joint leakage may occur due to the influence of equipment itself, process transformation, and human sabotage factors during production and operation. During maintenance, the process must be in a state of shutdown and pressure relief. Explosive oil and gas mixture, when electric welding is used for maintenance, especially when the construction is close to the pressure vessel, static sparks will appear, which can easily cause the pressure vessel to explode

There are two commonly used methods on site: one is to remove the pressure vessel before using electric welding, and then move it back to its original position after welding. This method is only suitable for small pressure vessels, and the construction is complicated and time-consuming

Another method is to clamp the gasket or insulating rubber between the inlet and outlet flanges of the pressure vessel, but at this time the flanges cannot be fixed with bolts, because the metal bolts are conductive, and the static sparks of electric welding will still cause the pressure vessel to explode

If the flanges are not fixed by bolts, the construction can be carried out far away from the pressure vessel. When the distance is close, the position cannot be fixed, and the second is that the electric welding flame and sparks are easy to ignite the oil-gas mixture in the pressure vessel, causing the pressure vessel to explode.

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