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Chapter 10 381 Marine Installations Step 10 Completing the Construction of the Land-to-Water Transition After the pipeline has been submerged, the portion of the pipeline that has been lowered into a land-to-water transition trench should be backfilled with specified material and to the required depth of cover. Post-Installation Survey Upon completion of the installation of a submerged pipeline, it is advisable to have the complete line surveyed by a competent diver to ensure that: • The pipeline is located within the prescribed right-of-way • The ballasts holding the pipeline are all properly sitting on the bottom contour and that the line is not forced to bridge any changes in elevation • The pipe is not resting on any rocks, debris or material that could cause damage • Any auxiliary lines, such as hoses, ropes, buoyancy blocks or any other equipment used during the installation has been removed • Where required, the pipe has been backfilled and the backfilling was done properly • All other installation requirements established by the designer for the subject application have been complied with. Other Kinds of Marine Installations Because of its flexibility, light-weight and toughness PE piping has also emerged as a choice material for other types of marine applications. The basic design and installation principles described above for the “float-and-sink” method are, with some modifications, also valid for other types of marine applications. A brief description of some other kinds of marine applications is presented in the paragraphs that follow. Winter Installations Where ice conditions permit, PE pipe may be submerged from the surface of a frozen lake or river. After a long pipe length is assembled by means of heat fusion it can be easily pulled alongside the right-of-way. The heat fusion process needs to be performed in an adequately heated tent, or other shelter, to ensure fusion joint quality. Once the heat fusion has been completed, the ballast weights can be mounted. An ice trench is then cut with a saw, the ice blocks are moved out of the way and the pipeline is pushed into the trench. The submersion is carried out in accordance with the procedure previously described.PDF Image | Marine Installations PE
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