METHOD FOR PRODUCING AN INSULATED PIPE IN CORRUGATED CASING

摘要

A method for producing an insulated pipe in corrugated casing (100) comprising the steps of: covering an inner pipe assembly (105) comprising at least one inner pipe (101) with a film (106); dispensing an expandable insulation material (102) in a liquid state between the inner pipe assembly (105) and the film (106) thereby preparing an initial pipe assembly (107) comprising a layer of expanding insulation material (102a) positioned between the film (106) and the inner pipe assembly (105); extruding a layer of outer casing (104) onto the initial pipe assembly (105) before the insulation material has expanded completely, thereby creating a still expanding insulated pipe assembly (118); and leading the still expanding insulated pipe assembly (118) through a corrugator (205) having an inner corrugated surface giving the casing (104) a corrugated shape as the at least one layer of expanding insulation material (118) continues to expand.

主权项

1. A method for producing an insulated pipe in corrugated casing comprising the steps of:
a) covering an inner pipe assembly comprising at least one inner pipe with a film; b) dispensing an expandable insulation material in a liquid state between the inner pipe assembly and the film thereby preparing an initial pipe assembly comprising a layer of expanding insulation material positioned between the film and the inner pipe assembly; c) extruding a layer of outer casing onto the initial pipe assembly before the insulation material has expanded completely, thereby creating a still expanding insulated pipe assembly; and d) leading the still expanding insulated pipe assembly through a corrugator having an inner corrugated surface giving the casing a corrugated shape as the at least one layer of expanding insulation material continues to expand thereby producing the insulated pipe in corrugated casing, wherein the layer of the expandable insulation material in a fully expanded state has an inner diameter dinner, and an outer diameter douter varying between a minimum outer diameter douter, min and a maximum outer diameter douter, max, the variation in outer diameter being defined by the corrugated shape of the casing.