Patent ID: 7779526

Claim:
A method for producing a collecting line for detecting and locating an agent discharging into an environment of the collecting line in a case of leakage, the collecting line containing a carrier pipe having a wall with a plurality of openings formed therein, the openings being sealed by a resilient material being permeable for the agent, which comprises the steps of: resiliently expanding a hose, at least over a portion of a length of the hose, the hose being made of a permeable resilient material and having an inside diameter being a same size as or smaller than an outside diameter of the carrier pipe, by generating a difference in pressure between an interior and an exterior of the hose by the further steps of: introducing the hose into a mounting device being double-walled at least over a portion of a length of the mounting device and the mounting device having a hollow cylindrical mounting pipe, the cylindrical mounting pipe being surrounded by an outer pipe set radially apart therefrom and having an inside diameter being larger than an outside diameter of the hose when relaxed, the cylindrical mounting pipe communicating, via a plurality of openings disposed on a circumference of the cylindrical mounting pipe, with a chamber disposed between the cylindrical mounting pipe and the outer pipe, the outer pipe surrounding the cylindrical mounting pipe and extending in a longitudinal direction; connecting at least one vacuum pump to the chamber; placing the hose tightly at its ends against the mounting device such that a hollow space, disposed between the hose and the mounting pipe and communicates with the chamber, is outwardly tightly sealed; evacuating the chamber for generating a reduced pressure; introducing the carrier pipe into the hose being a radially expanded hose; and placing the radially expanded hose against an outer surface of the carrier pipe by reducing a difference in pressure.