FIELD: process engineering.
SUBSTANCE: invention relates to metal pipe with internal plastic pipe. Said metal pipe with internal plastic pipe comprises protective sleeves to secure the ends of plastic pipe. Metal pipe ends can be plated from inside by shells of rustproof steel. Note here that their inner ends are covered by plastic pipe. Said plastic pipe is secured by protective sleeves to metal pipe end inner surface via shells of rustproof steel that plate their inner surface.
EFFECT: antirust protection of weld and its zone.
7 cl, 4 dwg
