Under-pressure isolation maintenance box of high-risk gas pipeline

Abstract

The invention provides an under-pressure isolation maintenance box of a high-risk gas pipeline. The under-pressure isolation maintenance box comprises a combined maintenance box base. The combined maintenance box base is a detachable maintenance box base, a hole allowing an under-pressure flange or a blind plate or a pipeline to pass is formed in the middle position of the combined maintenance boxbase, a lifting steering rod and a blind plate grabber are arranged on the combined maintenance box base, a transmission mechanism is arranged on the combined maintenance box base, the lifting steering box and the blind plate grabber are connected with the transmission mechanism, the transmission mechanism is connected with a peripheral operating unit on the outer side of the combined maintenancebox base, the combined maintenance box base is sleeved with a visible isolation cover, a pressure adjusting unit is arranged on the top of the visible isolation cover, and communicates with the visible isolation cover, and a valve lifter is arranged on the top of the visible isolation cover. By means of the manner that nitrogen or inert gas is added to closed space for replacement, a dangerous medium source is isolated from external air, and the transmission mechanism is operated in the oxygen-free closed environment.

Description

technical field [0001] The invention belongs to a chemical gas delivery system, and in particular relates to a pressurized isolation box during the maintenance of valves, vent valves, regulating valves, safety valves, maintenance blind plates and other equipment in high-risk gas systems. Background technique [0002] At present, domestic large-scale chemical plants have been put into operation for many years. After a certain period of time, it is necessary to overhaul various valves, vent valves, safety valves, regulating valves, inspection blinds and other equipment in the entire system. Overhaul, maintain or replace various valves, vent valves, safety valves, regulating valves, inspection blinds, etc. on pipelines, containers, and storage tanks that are always under pressure. Since the system is always under pressure, it is necessary to first Replace all kinds of valves and other equipment on the flange, and then replace them to the original place after overhaul. That is:...

AI Technical Summary

Problems solved by technology

[0004] It is replaced by non-isolation method, and there are major safety hazards in the replacement process, such as a large amount of toxic and harmful gases inside the system or the leakage of dangerous gases such as combustion and explosion.

[0005] The glove box is used to isolate the operation. Although the operation process can reduce the leakage of dangerous gases, it is necessary to reduce the internal pressure to below 10kPa. It is difficult for many devices to reduce the pressure below 10kPa. This requires forced venting to reduce the system pressure to below 10kPa. Maintenance operations cause great safety hazards and energy waste

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