Marine gas double-wall corrugated pipe and welding method thereof

Abstract

The invention discloses a marine gas double-wall corrugated pipe and a welding method thereof. The marine gas double-wall corrugated pipe comprises an inner corrugated pipe and an outer corrugated pipe which are welded between a gas inlet end flange and a gas outlet end flange and sleeved together, the gas inlet end flange and the gas outlet end flange are of integrated structures, inner ring walls and outer ring walls are arranged at the positions, on one side of flange bodies, of two flanges, the length of the inner ring walls is larger than that of the outer ring walls, the inner ring wallsare welded with the inner corrugated pipe, the outer ring walls are welded with the outer corrugated pipe, through the flanges of the integrated structures, the inner corrugated pipe and the outer corrugated pipe are supported through the flange bodies, the whole rigidity of the gas dual-wall corrugated pipe can be improved, the inner corrugated pipe is not prone to vibrating relative to the outer corrugated pipe, the welding line vibration-open risk is reduced, safety is improved, the outer welding line manner is completely adopted in the welding method, even if the radial size of the gas dual-wall pipe is small, welding operation can be conveniently carried out, and the problem that due to welding from an inner cavity of the inner corrugated pipe, the inner welding line is formed, and operation is not convenient can be solved.

Description

technical field [0001] The invention relates to the technical field of marine gas engines, in particular to a marine gas double-wall bellows and a welding method thereof. Background technique [0002] In recent years, with the increasing awareness of environmental protection in the international community, the utilization of clean energy has become an irreversible trend. The maritime sector has put forward stricter requirements on ship emissions. As a clean energy source, natural gas has obvious advantages in reducing costs and reducing nitrogen oxide and sulfur oxide emissions. Therefore, gas engines are widely used in the ship field. Natural gas engines used by ships require all natural gas transmission pipelines and storage structures to be double-walled, that is, natural gas is transported or stored in a sealed inner wall structure, and a layer of sealed wall is required outside the inner wall structure. When the natural gas on the inner wall leaks, the natural gas will...

AI Technical Summary

Problems solved by technology

In particular, for the gas double-wall pipe on the multi-point injection natural gas engine, the front end is connected to the high-pressure natural gas storage rail pipe, and the rear end is connected to the intake manifold of the engine cylinder, and the natural gas is injected into the engine cylinder by the natural gas high-pressure rail pipe The last transportation pipeline, the multi-point injection engine uses natural gas to inject double-wall pipes. It is required that the radial size should not be too large. slow engine response

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