Pipe with an outer wrap

1. A pipe comprising:

an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;

an inner liner spanning the corrugation valleys; and

at least one stiffener positioned within at least one corrugation crest, wherein the at least one stiffener reinforces a peak of the at least one corrugation crest,

wherein a portion of an inner surface of the corrugated outer wall is free from contact with the at least one stiffener and the inner liner.

2. The pipe of claim 1 , further comprising an outer wrap applied to the outer wall, the outer wrap spanning the corrugation crests and producing a smooth outer surface.

3. The pipe of claim 1 , wherein the at least one stiffener extends between the liner and the peak of the at least one corrugation crest.

4. The pipe of claim 1 , wherein the at least one stiffener comprises:

an inner portion in contact with the liner;

an outer portion positioned within the peak of the at least one corrugation crest; and

a middle portion extending between the outer portion and the inner portion,

wherein the outer portion is wider than the middle portion and narrower than the inner portion.

5. The pipe of claim 1 , wherein the at least one stiffener comprises:

an inner portion in contact with the liner; and

an outer portion extending between the inner portion and the peak of the at least one corrugation crest,

wherein the outer portion is narrower than the inner portion.

6. The pipe of claim 1 , wherein the at least one stiffener has a circular cross-section or an oval-shaped cross-section.

7. The pipe of claim 1 , wherein the at least one stiffener is hollow and is at least partially filled with a filling material.

8. The pipe of claim 1 , wherein the at least one stiffener extends along at least a portion of the corrugated outer wall within the at least one corrugation crest.

9. The pipe of claim 1 , wherein the at least one stiffener comprises a filling material which at least partially fills the at least one corrugation crest.

10. The pipe of claim 9 , wherein the filling material comprises one or more of polyurethane foam, high melt polyethylene, or aluminum foam.

11. The pipe of claim 1 , wherein the at least one stiffener is constructed of one or more of steel, PVC, thermosetting material, or fiberglass.

12. The pipe of claim 1 , wherein one or more stiffener is configured within each corrugation crest.

13. The pipe of claim 12 , wherein the corrugation crests and the one or more stiffeners extend helically along a longitudinal axis of the bore.

14. A method of reinforcing a pipe comprising:

receiving a corrugated pipe having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;

positioning at least one stiffener within at least one corrugation crest; and

applying an inner liner to span the corrugation valleys and to cover the at least one stiffener such that a portion of an inner surface of the corrugated outer wall is free from contact with the at least one stiffener and the inner liner.

15. The method of claim 14 , further comprising applying an outer wrap to span the corrugation crests.

16. The method of claim 15 , wherein applying the outer wrap comprises:

determining a wrap type to be applied to the corrugated pipe;

determining a flow rate for applying a wrap of the wrap type based on a type of plastic used in the wrap, a type of fiber used in the wrap, and the wrap type; and

applying a wrap, having a smooth outer surface, made of the type of fiber and the type of plastic to the corrugated pipe using the determined flow rate.

17. The method of claim 14 , wherein positioning the at least one stiffener comprises positioning the at least one stiffener within a peak of the at least one corrugation crest.

18. The method of claim 14 , wherein applying the inner liner comprises applying the inner liner to the at least one stiffener.

19. The method of claim 14 , wherein positioning the at least one stiffener comprises filling the at least one corrugation crest with filling material.

20. The method of claim 14 , wherein positioning the at least one stiffener comprises positioning at least one stiffener within each corrugation crest.

21. A pipe comprising:

an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;

an inner liner spanning the corrugation valleys; and

at least one stiffener positioned within at least one corrugation crest, wherein the at least one stiffener reinforces a peak of the at least one corrugation crest and wherein the at least one stiffener comprises:

an inner portion in contact with the liner,

an outer portion positioned within the peak of the at least one corrugation crest, and

a middle portion extending between the outer portion and the inner portion, wherein the outer portion is wider than the middle portion and narrower than the inner portion.

22. A pipe comprising:

an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;

an inner liner spanning the corrugation valleys; and

at least one stiffener positioned within at least one corrugation crest, wherein the at least one stiffener reinforces a peak of the at least one corrugation crest,

wherein the at least one stiffener is hollow and is at least partially filled with a filling material.

23. A method of reinforcing a pipe comprising:

receiving a corrugated pipe having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;

positioning at least one stiffener within at least one corrugation crest;

applying an inner liner to span the corrugation valleys and to cover the at least one stiffener; and

applying an outer wrap to span the corrugation crests, wherein applying the outer wrap comprises:

determining a wrap type to be applied to the corrugated pipe;

determining a flow rate for applying a wrap of the wrap type based on a type of plastic used in the wrap, a type of fiber used in the wrap, and the wrap type; and

applying a wrap, having a smooth outer surface, made of the type of fiber and the type of plastic to the corrugated pipe using the determined flow rate.