Abstract: The characteristics of ultra-high operating pressure of LDPE (EVA) plant determine the particularity and specialty of the design and installation of its pipelines and equipment. The application of modern three-dimensional laser scanning technology and three-dimensional model plays an important role in optimizing the design and reconstruction of such plants and improving the design efficiency and installation accuracy. Combined with the application experience of this technology in the reconstruction of a domestic EVA plant, this paper introduces the application method of 3D laser scanning technology, and analyzes and summarizes the advantages and disadvantages before and after the application, providing reference for the later construction and reconstruction of such plants.

Key words: LDPE, EVA, high pressure pipeline, 3D laser scanning, model