Floatable pipe combination

1. A floatable pipe combination comprising:

a plastic pipe having a rear longitudinal end, on which a rear flange region is formed, and a front longitudinal end, on which a front flange region is formed;

a rear closing cover arranged on the rear longitudinal end;

a front closing cover arranged on the front longitudinal end, wherein a pulling device is arranged on the front closing cover,

wherein at least on the front longitudinal end, a flange protection ( 8 ) with an outer protective covering is arranged,

wherein the outer protective covering is formed to radially project with respect to the outer diameter of the plastic pipe, and

wherein the flange protection comprises an internal protective body which encloses the circumference of the rear flange region.

2. The floatable pipe combination according to claim 1 ,

wherein at least one of the front flange region and the rear flange region comprises a lapped flange, which is supported on a, stub end and

wherein the outer protective covering of the flange protection is screwed together with the lapped flange.

3. The floatable pipe combination according to claim 2 , wherein the outer protective covering is formed in its base shape as a rotational body, which is open on its side facing the center of rotation and accommodates at least one of the front flange region and the second flange region.

4. The floatable pipe combination according to claim 3 , wherein the outer protective covering spans the front closing cover, the stub end and the lapped flange in a semicircle.

5. The floatable pipe combination according to claim 4 ,

wherein the outer protective covering is coupled to at least one of the first flange region and the second flange region by a threaded rod,

wherein in the lapped flange and in the front closing cover through-bores are formed which are penetrated by the threaded rod,

wherein on the threaded rod inner clamping nuts are arranged,

wherein the front closing cover and the lapped flange are clamped to each other by the inner clamping nuts, and

wherein the outer protective covering is clamped between outer clamping nuts and the inner clamping nuts.

6. The floatable pipe combination according to claim 5 , wherein clamping rings or clamping ring segments are arranged between the outer clamping nuts and the outer protective covering.

7. The floatable pipe combination according to claim 3 ,

wherein the outer protective covering comprises a first covering part and a second covering part ( 42 ), and

wherein the first covering part is arranged in the region of the lapped flange and the second covering part is arranged in the region of the front closing cover.

8. The floatable pipe combination according to claim 1 , wherein the outer protective covering is formed from a plastic material.

9. The floatable pipe combination according to claim 8 , wherein the outer protective covering is formed from polyethylene.

10. The floatable pipe combination according to claim 1 , wherein the outer protective covering comprises individual protective covering segments, which are welded together to form the outer protective covering.

11. The floatable pipe combination according to claim 1 , wherein a centering ring is arranged on an inner end face of the front closing cover arranged on the front longitudinal end.

12. The floatable pipe combination according to claim 1 ,

wherein a pulling shackle is coupled to the front closing cover arranged at the front longitudinal end, and

wherein a pivot bearing is formed between the pulling shackle and the front closing cover such that the pulling shackle is arranged on the front closing cover so as to be rotatable relative to the front closing cover.

13. The floatable pipe combination according to claim 1 , wherein the outer protective covering has a radially outer side and a radially inner side, and

wherein stiffening ribs are arranged on the outer protective covering on at least one of the radially outer side and the radially inner side.

14. The floatable pipe combination according to claim 1 , wherein the outer protective covering has a wall thickness of between 5 mm and 25 mm.

15. A method for producing the floatable pipe combination according to claim 1 , comprising the following method steps:

providing a plastic pipe having a rear longitudinal end, on which a rear flange region is formed, and a front longitudinal end, on which a front flange region is formed;

mounting a rear closing cover to the rear longitudinal end of the plastic pipe;

mounting a front closing cover to the front longitudinal end of the plastic pipe;

mounting an outer protective covering of a flange protection to the front longitudinal end of the plastic pipe,

wherein the outer protective covering is formed to radially project with respect to the outer diameter of the plastic pipe, and

wherein the flange protection comprises an internal protective body which encloses the circumference of the rear flange region.

16. The method according to claim 15 ,

wherein the front closing cover is mounted to the front longitudinal end of the plastic pipe by threaded rods and inner clamping nuts,

wherein subsequently in the course of the method individual protective covering segments are mounted to the threaded rods by outer clamping nuts, and

wherein the individual protective covering segments are welded together to form the outer protective covering.

17. A floatable pipe combination comprising:

a plastic pipe having a rear longitudinal end, on which a rear flange region is formed, and a front longitudinal end, on which a front flange region is formed;

a rear closing cover arranged on the rear longitudinal end;

a front closing cover arranged on the front longitudinal end, wherein a pulling device is arranged on the front closing cover,

wherein at least on the front longitudinal end, a flange protection with an outer protective covering is arranged,

wherein the outer protective covering is formed to radially project with respect to the outer diameter of the plastic pipe,

wherein the front flange region comprises a lapped flange, which is supported on a stub end,

wherein the front closing cover is screwed together with the lapped flange, and

wherein the outer protective covering of the flange protection is screwed together with the lapped flange.