Method of manufacture of a subject of the chemical engineering

摘要

In the manufacturing process: a) an inner layer (2) made of metal anticorrosives is formed from an inner metal strip (4), for example, by assembling together by a longitudinal weld (5) at least two portions (40), called the inside of said internal metal strip (4), placed edge to edge, forming between them a hollow part, referred to as longitudinal (50), b) an outer layer (3) is formed from a metal strip from the outside (6), c) the inner layers (2) and (3) are joined together by a radial assembly means (7) by means of a radial hollow part (70). the process is characterized in that it forms the longitudinal weld (5) and / or said assembly means (7) which are radial projecting at high speed in the longitudinal hollow part (50) and / or radial (70), a powder (80) of said metal anticorrosives forming a compact mass of metal (51,71) having a density at least equal to 0,8 times the density of said metal anticorrosives.