Pipeline for petrochemical fluids etc. - has plastics tube between inner tube and casing soluble in medium handled

摘要

The pipeline is for the transport of liquids or gases and particularly petrochemical liquids or solutions, having a leak-monitoring device comprising a corrugated inner tube and an outer protective casing. Between the inner tube and the outer casing surface is a further tube of plastic decomposed by or soluble in the medium handled, and which when working is subjected to a pressure different from the normal pressure. The inner tube can have a spiral corrugation, the plastic tube being accommodated in the grooves in it. Typically the assembly is used as a suction line for heating oil, petrol, diesel fuel, etc.