Title:
CORROSION PREVENTION STRUCTURE FOR FLEXIBLE PIPE
Document Type and Number:
WIPO Patent Application WO/2011/083819
Kind Code:
A1
Abstract:
Disclosed is a corrosion prevention structure such that even in very deep water, corrosive gas in a reinforcing layer can be reliably replaced with fresh air, that corrosion of reinforcing bar assemblies in the reinforcing layer can be prevented, and that it is possible to achieve high strength by using carbon. A flexible pipe (1) is provided with an inner pipe (11) having liquid-tightness; an outer sheath (15); and an inner axial force reinforcing bar assembly (13) and an outer axial force reinforcing bar assembly (14) both of which consist of a plurality of spirally twisted bar members and are disposed in a reinforcing layer (T) between the inner pipe (11) and the outer sheath (15). Said flexible pipe (1) constitutes the corrosion prevention structure such that the corrosive gas in the reinforcing layer (T), which is disposed between the inner pipe (11) and the outer sheath (15), is discharged axially from the tip end side to the base end side. Furthermore, the flexible pipe (1) is configured in such a way that a plurality of small diameter tubes (17) are installed which are disposed in spiral enlarged gaps (14b) that are provided between the bar members of the outer axial force reinforcing bar assembly (14), and which extend continuously along the pipe axial direction.
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Inventors:
HAJOTA HIROAKI (JP)
KIMURA HIDEO (JP)
KIMURA HIDEO (JP)
Application Number:
PCT/JP2011/050107
Publication Date:
July 14, 2011
Filing Date:
January 06, 2011
Export Citation:
Assignee:
NIPPON STEEL ENG CO LTD (JP)
HAJOTA HIROAKI (JP)
KIMURA HIDEO (JP)
HAJOTA HIROAKI (JP)
KIMURA HIDEO (JP)
International Classes:
F16L11/12; F16L58/00
Foreign References:
| JPS60118080U | 1985-08-09 | |||
| JPS59226787A | 1984-12-19 | |||
| JPS6383486A | 1988-04-14 | |||
| JPH01171989U | 1989-12-06 |
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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Claims: