sgxhappy
发表于 03-21-2008 - 15:45
精准.石油.论坛 forum.petro-china.com
What is claimed is:
1. A method for installing an offshore pipeline, comprising:
structurally connecting an inner pipe and an outer at a terminal end of a pipe-in-pipe flowline having an annulus between the inner and outer pipes;
placing centralizers in the annulus to prevent buckling of the inner pipe which takes lateral support from the outer pipe;
suspending the working end of the pipeline under construction in a substantially vertical position within slips at the weld floor of a J-lay installation barge;
adding a section of inner pipe, comprising:
grasping a section of inner pipe, orienting the section of inner pipe to a vertical position;
bringing the section of inner pipe into abutting position with the inner pipe at the working end of the pipeline under construction;
welding the section of inner pipe to the inner pipe of the working end of the pipeline under construction; and
coating the inner pipe with an arc resistant material;
adding a section of outer pipe, comprising:
grasping a section of outer pipe, orienting the section of outer pipe to a vertical orientation;
sliding a section of the outer pipe down over the section of inner pipe just welded to the working end of the pipeline under construction;
bringing the section of outer pipe into abutting position with the working end of the pipeline under construction; and
welding the section of outer pipe to the outer pipe of the working end of the pipeline under construction presented through the slips at the weld floor of the installation barge;
advancing the end of the working end of the pipeline through the slips to bring the end of the section of outer pipe added adjacent the weld floor; and
repeating the foregoing steps to add additional sections of inner and outer pipe as necessary to complete the pipeline.
2. A method for installing an offshore pipeline in accordance with claim 1 wherein grasping a section of inner pipe comprises connecting an internal plug within an end of the section of inner pipe.
3. A method for installing an offshore pipeline in accordance with claim 2 wherein grasping a section of outer pipe comprises engaging a collar / elevator about a shoulder presented on an end of the section of outer pipe.
4. A method for installing an offshore pipeline in accordance with claim 3 wherein the sections of inner and outer pipe are grasped concentrically and brought into position over the working end of the pipeline under construction.
5. A method for installing an offshore pipeline in accordance with claim 4 further, comprising taking steps to prevent water and debris from entering the annulus between the inner and outer pipes during construction.
6. A method for installing an offshore pipeline in accordance with claim 5 wherein coating the weld at the inner pipe with an arc resistant material comprises sealing the weld with a shrink sleeve.
7. A method for installing an offshore pipeline in accordance with claim 6, further comprising installing insulated panels over the shrink sleeve.
8. A method for installing an offshore pipeline in accordance with claim 7, wherein the insulated panels between the two welds comprise a high temperature thermal insulation material.
9. A method for installing an offshore pipeline in accordance with claim 1, further comprising providing a corrosion coating over the outside of the weld joining the section of outer pipe to the outer pipe of the working end of the pipeline.
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