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WO2010008300A1 - Procédé et système de protection contre l'abrasion d'une structure dans un environnement marin - Google Patents

Procédé et système de protection contre l'abrasion d'une structure dans un environnement marin Download PDF

Info

Publication number
WO2010008300A1
WO2010008300A1 PCT/NO2009/000263 NO2009000263W WO2010008300A1 WO 2010008300 A1 WO2010008300 A1 WO 2010008300A1 NO 2009000263 W NO2009000263 W NO 2009000263W WO 2010008300 A1 WO2010008300 A1 WO 2010008300A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
cooling
surface area
ice
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NO2009/000263
Other languages
English (en)
Inventor
Rolf Valum
Odd Inge Lunde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
POLKONSULT AS
Original Assignee
POLKONSULT AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by POLKONSULT AS filed Critical POLKONSULT AS
Publication of WO2010008300A1 publication Critical patent/WO2010008300A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/60—Piles with protecting cases
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/0017—Means for protecting offshore constructions

Definitions

  • the present invention relates to a method and system for protecting a structure in a marine/aquatic environment against abrasion.
  • the object of the present invention is to provide a method and system for protecting a structure against abrasion, where the above disadvantages are avoided. It should be easy to maintain, install and operate.
  • the present invention relates to a method for protecting a structure in a marine/ aquatic environment against abrasion, comprising the following steps: cooling at least a part of a surface area of the structure; exposing the surface area to a fluid having a freezing temperature higher than the surface temperature of the structure, thereby causing the fluid to freeze onto the surface area and form a protective ice coating.
  • the cooling is performed by circulating a cooling fluid within or near the structure.
  • the cooling fluid is circulated within or near the surface area of the structure.
  • the fluid is a freely available fluid surrounding the structure, such as sea water, fresh water etc.
  • the cooling is performed in a part of the surface area being in a splash zone of the fluid.
  • the cooling is performed by controlling the cooling fluid to flow only to parts of the structure near the splash zone.
  • the present invention also relates to a system for protecting a structure in a marine/ aquatic environment against abrasion, comprising: cooling means for cooling at least a part of a surface area of the structure; a protective ice coating provided on the surface area of the structure, where the ice coating comprises a fluid having a freezing temperature higher than the surface temperature of the structure.
  • the cooling means comprises a piping means for circulation of a cooling fluid within or near the structure.
  • the piping means is provided within or near the surface are of the structure.
  • the cooling means is provided for cooling the surface area of the structure to a temperature below a freezing temperature of the fluid.
  • the fluid is a freely available fluid surrounding the structure, such as sea water, fresh water etc.
  • the cooling means is provided for cooling down a part of the surface area being in a splash zone of the fluid.
  • the cooling means comprises control means to control the supply of cooling fluid to the part of the surface area being in a splash zone of the fluid.
  • the cooling means comprises a refrigeration plant connected to the piping means, where the refrigeration plant is cooling down the cooling fluid
  • the system comprises fluid applying means, for applying fluid onto the surface area.
  • the fluid applied by the fluid applying means is supercooled/precooled to a temperature below its freezing temperature.
  • FIG. 1 illustrates a first embodiment where the system is incorporated in the structure
  • Fig. 2 illustrates an enlarged detailed view of the structure with piping
  • Fig. 3 illustrates an enlarged detailed view of a second embodiment of the structure and piping
  • Fig. 4 illustrates an enlarged detailed view of a third embodiment of the structure and piping.
  • a system 10 is provided on a structure 1 for protecting the structure 1 against abrasion.
  • the structure 1 is a semi- submerged structure, for example a leg of an oil platform.
  • the structure 1 can also be a bridge column or other types of semi-submerged structures as mentioned in the introduction above.
  • the structure is hollow, i.e. there is a compartment 2 inside the structure 1.
  • the compartment 2 will normally contain air or water.
  • the semi-submerged structure 1 provided in the splash zone of the sea, having an (average) sea level as indicated in fig. 1.
  • the splash zone is here used to describe the zone between a lower level and a upper level, where the water level is variating because of waves, tides, regulations (for example regulations between lower and upper water level in dam installations of hydro-electric power stations) etc.
  • the air temperature Tl is -20°C - the sea water temperature T2 is 2°C the air/water compartment temperature T3 is 2°C
  • the system 10 comprises cooling means 11 for cooling the surface area of the structure.
  • the cooling means 11 (indicated by dashed lines in fig. 1) comprises piping means 12 for circulation of a cooling fluid within or near a surface
  • the cooling means 11 provides a cooling of the surface area of the structure 11 to a temperature below the freezing temperature of the sea water.
  • sea waves since sea waves are washed onto the surface area 3 of the structure 1 , some of the water will be frozen onto the surface area 3 of the structure as a protective ice coating 13 (indicated by a dotted area).
  • the cooling means 11 further comprises a refrigeration plant 14 for cooling down the cooling fluid.
  • the cooling means 11 further comprises pumps, valves, fittings, supports, thermostats etc (hot shown,) for circulating the cooling fluid through the piping means 12.
  • the cooling fluid can be any suitable cooling fluid.
  • the refrigeration plant 14 would normally be a suitable commercial available refrigeration plant.
  • the refrigeration plant 14 is considered known for a skilled person and will thus not be described here in detail.
  • the cooling means may also comprise control means (not shown).
  • the control means controls the flow of the cooling fluid only to some pipes of the piping means 12, so that only necessary parts of the surface area are cooled down. This would reduce the energy consumption of the cooling means.
  • the temperature T4 of the protective ice coating 13 can for example be approximately -25 °C near the surface of the structure. Consequently, the ice coating 13 will be colder than most drifting ice floating in the sea.
  • a block of sea ice 16 is drifting towards the ice coated structure. This sea ice will have a temperature in the area -1°C to -5°C. The interface between the sea water and the ice will have a temperature of -2 0 C.
  • the protecting coating 13 will also protect the structure when ice floating in the sea collides with the protective coating 13.
  • sea ice and fresh ice show an increase in both compressive and tensile strength with decreasing temperature, and will, when put under strain, normally yield in areas with lowest strength.
  • the ice coating 13 as shown in fig. 1 will have the lowest temperature near the surface of the structure, and a progressive increasing temperature at increasing distance from the surface.
  • an ice fracture zone or outer part 15 of the ice coating 13 is provided, illustrating a zone where ice will build up and fracture as floating ice 16 arrives towards the structure.
  • the outer part 15 of the ice coating will yield before the inner part of the ice coating, and the drifting ice will yield before the inner part of the ice coating.
  • the ice coating 13 would be relatively homogenous, with a lower salinity and porosity than natural ice 16, since natural ice 16 often contain salt water pockets, crushed ice and snow and is thus relatively inhomogeneous comparted with the ice coating 13.
  • a sacrificial, self-repairing ice coating is provided, where the ice coating is replenishing itself as it gets eroded.
  • the drifting ice will be deflected and break up before it gets in physical contact with the structures.
  • the system 10 can limit the number of freeze/thaw cycles to only one per season (i.e. freezing the structure down during winter and thawing the structure during summer), thereby significantly enhance the abrasion resistance of concrete exposed to the combined effect of sea water and freezing/thawing .
  • the structure 1 is build up of vertical reinforcement bars 20, horizontal reinforcement bars 21, horizontal transverse reinforcement bars 22 and concrete 23.
  • the pipes of the piping means 12 can be provided as a part of the construction of the structure 1, for example supported by the reinforcement bars 20, 21 near the surface area 3 of the structure 1.
  • the piping of the piping means 12 is located inside the air/water compartment 2. This may be the case if the system 10 is to be mounted onto the structure 1 as a separate operation, for example after the fabrication of the structure 1.
  • the piping means 12 is located near the inner surface of the structure 1. Outside the piping means 12, a casing 24 can be provided to protect and insulate the piping means 12. Insulation 25 can also be provided around the piping means 12. In this embodiment, a larger part of the structure 1 will be cooled than in the above embodiments.
  • the piping of the piping means is provided outside the surface area 3 of the structure 1.
  • the piping means 12 is located inside a protective coating 30 of a heat conducting material, for example a stainless steel or another type of metal or similar material. Consequently, the protective coating 30 is providing an additional surface area 3 a of the structure 1.
  • An insulation layer 31 can be provided between the piping means 12 and the structure 1. In this embodiment, the concrete part 23 of the structure will not be cooled as much as in the above embodiments.
  • the method comprises cooling at least a part of the the surface area 3, 3 a of the structure. Then, the surface area is exposed to a fluid, having a freezing temperature higher than the surface temperature of the structure, thereby causing the fluid to freeze onto the surface area and form a protective ice coating.
  • the cooling is performed by circulating a cooling fluid within or near the structure, or more specif! cially within or near the surface area of the structure.
  • the fluid is an an freely available fluid surrounding the structure, such as sea water, fresh water or brackish water.
  • the cooling can be performed by circulating cooling fluid in the whole structure. However, the cooling would in most applications be performed only in a part of the surface area being in the splash zone of the fluid. In some applications, the circulation of the cooling fluid is controlled to flow only to parts of the structure near the wave zone.
  • the fluid used to form the protective ice coating 13 is a freely available fluid surrounding the structure; normally this would be sea water or fresh water. However, it would also be possible to use other suitable fluids.
  • the system 10 comprises a fluid applying means, for applying the fluid onto the surface area manually.
  • the fluid applied by the fluid applying means is supercooled or precooled to a temperature below freezing temperature before it is applied to the surface area of the structure. In this way, the ice coating will build up faster.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Mechanical Engineering (AREA)
  • Catching Or Destruction (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

L'invention porte sur un procédé et sur un système de protection contre l'abrasion d'une structure dans un environnement marin/aquatique. Le procédé comprend le refroidissement d'au moins une zone de surface de la structure et l'exposition de la zone de surface à un fluide ayant une température de congélation supérieure à la température de surface de la structure. Il en résulte que le fluide gèle sur la surface et forme un revêtement de glace protecteur.
PCT/NO2009/000263 2008-07-14 2009-07-13 Procédé et système de protection contre l'abrasion d'une structure dans un environnement marin Ceased WO2010008300A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20083123A NO332131B1 (no) 2008-07-14 2008-07-14 Fremgangsmate og system for beskyttelse av en struktur i et marint miljo mot slitasje
NO20083123 2008-07-14

Publications (1)

Publication Number Publication Date
WO2010008300A1 true WO2010008300A1 (fr) 2010-01-21

Family

ID=41066242

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2009/000263 Ceased WO2010008300A1 (fr) 2008-07-14 2009-07-13 Procédé et système de protection contre l'abrasion d'une structure dans un environnement marin

Country Status (2)

Country Link
NO (1) NO332131B1 (fr)
WO (1) WO2010008300A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009986A1 (fr) * 1978-10-06 1980-04-16 Graeme Eadie Structure de support destinée à être utilisée dans l'eau
WO1986006771A1 (fr) * 1985-05-16 1986-11-20 Geoffrey Milson John Williams Structures offshore
JPS6217212A (ja) * 1985-07-15 1987-01-26 Nippon Kokan Kk <Nkk> 氷海人工島

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009986A1 (fr) * 1978-10-06 1980-04-16 Graeme Eadie Structure de support destinée à être utilisée dans l'eau
WO1986006771A1 (fr) * 1985-05-16 1986-11-20 Geoffrey Milson John Williams Structures offshore
JPS6217212A (ja) * 1985-07-15 1987-01-26 Nippon Kokan Kk <Nkk> 氷海人工島

Also Published As

Publication number Publication date
NO20083123L (no) 2010-01-15
NO332131B1 (no) 2012-07-02

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