CN201043641Y

CN201043641Y - Single-layer heat-preserving counterbalance pipe with cathode protection device used in oceanography engineering

Info

Publication number: CN201043641Y
Application number: CNU2006200252520U
Authority: CN
Inventors: 陆长山; 王庆章; 王章领; 丁九亮
Original assignee: China National Offshore Oil Corp CNOOC; Offshore Oil Engineering Co Ltd; CNOOC China Ltd Tianjin Branch
Current assignee: China National Offshore Oil Corp CNOOC; Offshore Oil Engineering Co Ltd; CNOOC China Ltd Tianjin Branch
Priority date: 2006-01-24
Filing date: 2006-01-24
Publication date: 2008-04-02
Anticipated expiration: 2016-01-24

Abstract

A monolayer insulation counterbalance tube with cathode protection device used in cathode protection device consists of a riser and a submarine pipeline; the core of the riser is steel core tube which is covered by a fritting epoxy anticorrosion coating which is again covered by a polyurethane insulation layer, again covered by a high-density polyethylene pipe, the most outer surface is a concrete weighted coating; a rotating flange is used in the connection of the submarine pipeline; the improvement is that: the steel outer pipe of the riser is provided with a sacrificial anode, the rotating flange of the submarine pipeline is installed with an electric connecting copper sheet of the sacrificial anode which not only can protect the submarine pipeline from corrosion, but also is convenient to install, thereby improves the land precast progress of submarine pipelines and increases the operation efficiency of offshore pipe laying.

Description

The individual layer insulation counterweight pipe that has cathode protection device that in ocean engineering, uses

Technical field

The utility model relates to the submerged pipeline that uses in a kind of ocean engineering, relates in particular to a kind of individual layer insulation counterweight pipe that has cathode protection device.

Background technique

Corrosion in various degree all can take place in the zones of different of the submerged pipeline in the ocean engineering in ocean environment, and these corrosion are most of to be electrochemical corrosion.Some is in the pipeline (particularly standpipe) of tidal range district and splash zone; its environment of living in is the oxygen abundance not only, corrodes more seriously, and it is bigger influenced by stormy waves, trend, ice slush etc.; sometimes may its protective layer be damaged by bump such as marine floating debris or boats and ships, cause local etching.In addition, because pipeline is in the seabed, and majority is embedded in the ooze, thereby the inspection of pipeline, maintenance difficulty more.

In order to protect submerged pipeline to avoid corrosion, comprise that nearly all marine structure of submerged pipeline all adopts cathodic protection to prevent the generation and the development of corroding.Submerged zone in ocean environment, cathodic protection are divided into impressed current cathodic protection and galvanic anode protection, and at present in the cathodic protection of submerged pipeline; adopted the galvanic anode protection method in a large number; its advantage is that design and construction are simple, does not need to safeguard, protects effective.Its technology is such:

Please refer to Fig. 1, shown in Figure 2, parts 5 are the platform first, and 6 is platform second.Standpipe 3 is fixed on the platform leg 8 by clamp 7, and is fixing by hanging flange 4 between the pipeline section of standpipe 3; Submerged pipeline 2 is interconnected with standpipe 3, is to manage 16 in the steel with reference to the core of its neutral tube 3 of Fig. 6, wraps up one deck polyurethane insulation coating 17 again, and outermost is a steel outer tube 18; Core with reference to Fig. 5 submerged pipeline 2 is to manage 11 in the steel, is one deck fusion bonded epoxy corrosion-inhibiting coating 12 outside the interior pipe 11, and its outer one deck polyurethane insulation coating 13 that wraps up again is with high density polyethylene pipe 14 outside the thermal insulation layer 13, and outermost is one deck concrete weighted coating 15.Submerged pipeline 2 adopts rotary flange 9 to connect.On standpipe 3 and submerged pipeline 2, be uniform-distribution with some sacrificial anodes 1.Be made up of two semicircle anode bodies 41 up and down with reference to Fig. 7 sacrificial anode 1, it is conjunction cable that some

anode cores

42,43 are arranged on the anode bodies 41.Protecting submerged pipeline 2 and standpipe 3 effectively by sacrificial anode 1.

Yet, because the discontinuity of the concrete weighted coating that the installation sacrificial anode causes on pipeline section certainly will cause concrete weighted coating easily slippage in pipelaying work, and, cause the electric connection line of sacrificial anode to come off easily.Thereby influence the operating efficiency of prefabricated progress in submerged pipeline land and marine pipe-laying on the whole.

The model utility content

The purpose of this utility model promptly is to provide a kind of individual layer insulation counterweight pipe of being furnished with cathode protection device, makes it can effectively protect submerged pipeline to avoid corrosion and is convenient to again install, thereby improve the prefabricated progress in land of submerged pipeline and the operating efficiency of marine pipe-laying.

The purpose of this utility model is realized by following technological scheme.

A kind of individual layer that has cathode protection device that uses in ocean engineering is incubated the counterweight pipe, and being connected by standpipe and submerged pipeline forms; The core of standpipe is a pipe in the steel, pipe outer wrapping one deck polyurethane insulation coating in the steel, and outermost is one deck steel outer tube; The core of submerged pipeline is a pipe in the steel, and pipe outer wrapping one deck fusion bonded epoxy corrosion-inhibiting coating wraps up polyurethane insulation coating from level to level outside it again in the steel, and thermal insulation layer is surrounded by one deck high density polyethylene pipe outward, and outermost is one deck concrete weighted coating; The joint of submerged pipeline adopts rotary flange to connect; It is characterized in that suit sacrificial anode on the steel outer tube of described standpipe, on the rotary flange of described submerged pipeline, install and be electrically connected steel disc.

After adopting the utility model, owing to cancelled the sacrificial anode on the submerged pipeline, the discontinuity of the concrete weighted coating of having avoided so having caused, thereby eliminated concrete weighted coating easy slippage and anode electric connection line hidden danger such as come off in pipelaying work, improved the prefabricated progress in land of submerged pipeline and the operating efficiency of marine pipe-laying greatly.

Description of drawings

Fig. 1 is the submerged pipeline schematic representation that adopts conventional art.

Fig. 2 is the standpipe schematic representation that adopts conventional art.

Fig. 3 is the submerged pipeline schematic representation that adopts the utility model technology.

Fig. 4 is the standpipe schematic representation that adopts the utility model technology.

Fig. 5 is the cross-sectional view of submerged pipeline.

Fig. 6 is the cross-sectional view of standpipe.

Fig. 7 is the structural representation of sacrificial anode.

Fig. 8 is the structural representation of rotary flange.

Embodiment

Please refer to shown in Fig. 3, Fig. 4, wherein parts 5 are the platform first, and 6 is platform second.Standpipe 3 is fixed on the platform leg 8 by clamp 7, and the pipeline section of standpipe 3 connects by hanging flange 4, is to manage 16 in the steel with reference to the core of Fig. 6 standpipe 3, is one deck polyurethane insulation coating 17 between pipe 16 and the steel outer tube 18 in the steel.Standpipe 3 is interconnected with the flat pipe submerged pipeline 2 in seabed, core with reference to Fig. 5 submerged pipeline 2 is to manage 11 in the steel, pipe 11 outer wrapping one deck fusion bonded epoxy corrosion-inhibiting coatings 12 in the steel, its outer one deck polyurethane insulation coating 13 that wraps up again, be surrounded by one deck high density polyethylene pipe 14 outside the thermal insulation layer 13, outermost is one deck concrete weighted coating 15.The pipeline section of submerged pipeline 2 adopts rotary flange 9 to connect.The utility model only is set with sacrificial anode 1 on the steel outer tube 18 of standpipe 3, consult Fig. 1, shown in Figure 2, compared with prior art cancelled the sacrificial anode 1 that on submerged pipeline 2, is provided with, thus, avoided the discontinuity of construction concrete weighted coating, eliminate concrete weighted coating easy hidden danger of coming off of slippage and anode electric connection line in pipelaying work, improved the working efficiency of submerged pipeline pipe laying.Be made up of two anode bodies 41 with reference to Fig. 7 sacrificial anode 1, two anode bodies 41 are provided with some anode cores 42,43rd, conjunction cable.With reference to shown in Figure 8, the utility model rotary flange 9 usefulness bolt assemblies 31 are fastening, also are provided with the

connection steel disc

32,33 of welding sacrificial anode on the rotary flange 9.

Claims

1. an individual layer that has cathode protection device that uses in ocean engineering is incubated the counterweight pipe, and being connected by standpipe and submerged pipeline forms; The core of standpipe is a pipe in the steel, pipe outer wrapping one deck polyurethane insulation coating in the steel, and outermost is one deck steel outer tube; The core of submerged pipeline is the interior pipe of steel, is one deck fusion bonded epoxy corrosion-inhibiting coating outside the pipe in the steel, wraps up one deck polyurethane insulation coating again outside it, and thermal insulation layer is surrounded by one deck high density polyethylene pipe outward, and outermost is one deck concrete weighted coating; The joint of submerged pipeline adopts rotary flange to connect; It is characterized in that suit sacrificial anode on the steel outer tube of described standpipe is installed the electrical connection steel disc that welds sacrificial anode on the rotary flange of described submerged pipeline.