| 摘要 |
<p>A metal pipe, preferably of steel, which is resistant corrosion, inside with respect to the conveyed medium and outside with respect to its surroundings, comprises a comparatively thin-walled core (1), a plurality of strips (2) which are highly tensioned and helically wound in layers, one layer crossing the other, each layer being joined to the underlying one, e.g. by means of welding, and, externally a comparatively thin casing (3) a plant for producing such pipe, comprising an arrangement of three co-acting operational stations, first a unit (Figs. 1 and 2) for producing a pipe core (1) from a strip wound on a reel (13), thereafter a second station comprising a plurality of winding units (4) (Figs. 3-6) for applying highly tensioned strip on the outside of the pipe core (1), welded to the pipe core and to underlying layers of strip, and finally a unit (Figs. 7 and 8) for providing the outmost layer of strip (2) with a sealing casing (3) from a strip (39) mounted on a reel. Method for producing such pipes with adjustable length. </p> |
