Collecting line for monitoring and locating leakages and device having the collecting line

1. A collecting line for monitoring and locating leakages at an installation, the collecting line comprising:

a body in the form of a hollow pipe having first and second ends, a longitudinal direction and a subarea extending in said longitudinal direction;

said body being permeable to a substance to be monitored, at least in said subarea;

said subarea having at least one first subsection and at least one second subsection;

said at least one first subsection being disposed at a first distance from said first end, and said at least one second subsection being disposed at a second distance from said first end being greater than said first distance; and

said at least one first subsection having a greater permeability than said at least one second subsection.

2. The collecting line according to claim 1 , wherein said permeability continuously decreases from said first end in said longitudinal direction as said distances increase.

3. The collecting line according to claim 1 , wherein said body is a pipe having openings formed therein, and a material being permeable to the substance to be monitored closes said openings.

4. The collecting line according to claim 3 , which further comprises a layer coating said pipe and being permeable to the substance to be monitored.

5. The collecting line according to claim 4 , wherein said openings define areas in said at least one first subsection and in said at least one second subsection, and said area in said at least one first subsection is larger than said area in said at least one second subsection.

6. The collecting line according to claim 5 , wherein said openings are disposed in at least one row aligned in said longitudinal direction.

7. The collecting line according to claim 4 , wherein said openings are disposed in at least one row aligned in said longitudinal direction.

8. The collecting line according to claim 4 , wherein said material closing said openings has a greater permeability in said first subsection than in said second subsection, and said permeable layer has a smaller thickness in said first subsection than in said second subsection.

9. The collecting line according to claim 8 , wherein said material closing said openings has a different composition in said first subsection than in said second subsection.

10. The collecting line according to claim 3 , wherein said openings define areas in said at least one first subsection and in said at least one second subsection, and said area in said at least one first subsection is larger than said area in said at least one second subsection.

11. The collecting line according to claim 10 , wherein said openings are disposed in at least one row aligned in said longitudinal direction.

12. The collecting line according to claim 3 , wherein said openings are disposed in at least one row aligned in said longitudinal direction.

13. The collecting line according to claim 12 , wherein said at least one row includes a greater number of rows in said first subsection than in said second subsection.

14. The collecting line according to claim 12 , wherein said at least one row has a greater number of openings in said first subsection than in said second subsection.

15. The collecting line according to claim 12 , wherein said openings in said first subsection are larger than in said second subsection.

16. The collecting line according to claim 3 , wherein said material closing said openings has a greater permeability in said first subsection than in said second subsection.

17. The collecting line according to claim 16 , wherein said material closing said openings has a different composition in said first subsection than in said second subsection.

18. A device for monitoring and locating leakages, the device comprising:

a collecting line according to claim 1 ; and

a sensor for the substance to be monitored, said sensor being connected to said second end of said body.