Welding method for two-layer pipe elbow

Abstract

The invention discloses a welding method for a two-layer pipe elbow. The two-layer pipe elbow comprises an inner straight pipe, an inner pipe elbow body, an outer straight pipe and an outer pipe elbow body. The inner diameter of the outer pipe elbow body is larger than the outer diameter of the outer straight pipe. The two sides of the outer pipe elbow body are provided with different-diameter connectors which are connected with the outer straight pipe. The problem that the two-layer pipe outer straight pipe cannot be installed is solved on the basis of the welding method for the two-layer pipe elbow. According to the welding method for the two-layer pipe elbow, the two-layer pipe elbow is reasonably divided into three parts, that is, the elbow body with an enlarged diameter and the two different-diameter connectors (welded to the outer straight pipe in an overlap mode), and thus the problem that the inner straight pipe cannot be welded is solved; and meanwhile, the outer pipe elbow body can be welded at last, and a space is easily transferred out by the outer pipe elbow body through moving of the different-diameter connectors on the outer straight pipe.

Description

technical field [0001] The invention relates to a connection at the elbow of a marine double-layer pipe, in particular to a welding method for a double-layer pipe elbow of a low-pressure gas pipe of a marine dual-fuel engine. Background technique [0002] With the improvement of environmental protection requirements, the application of dual-fuel engines is becoming more and more popular. Gas fuel, as a green and environmentally friendly energy source, is becoming more and more common in ships. However, in its application process, the corresponding gas pipeline needs to be set as a double-layer pipe. In the design process of the double-layer pipe, the design of the elbow has the following difficulties: 1. Since the two welds at the elbow of the inner pipe overlap with the two welds of the outer straight pipe, the two welds of the inner straight pipe 2. The outer straight pipe is an independent pipe and cannot be installed; 3. The outer straight pipe and the outer pipe elbow ...

AI Technical Summary

Problems solved by technology

[0003] In view of the above, the object of the present invention is to provide a welding method for a double-layer pipe elbow, which is used to solve the problems in the prior art that the inner pipe elbow cannot be welded, the outer straight pipe cannot be installed, and the outer pipe elbow cannot be moved.

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