el fayoum Gas Pipeline - European Investment Bank

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El Sadat – El Faium Gas Pipeline Environmental Impact Assessment 3 : project Description OHSAS 18 0 0 1 Backfilling Welding & welding inspection Tie in including valves Piping pneumatic test Piping cleaning Installation of permanent facilitates (heaters, fractions towers, gas turbines…...) Brief descriptions of the key activities contained in each phase are outlined below 3.7.1 Pipe, installations, storage & stringing The project management selected the needed sites for storing the pipes and other installations in an area selected carefully for such purpose. The Contractor will pay great attention in adapting appropriate procedures (approved by GASCO) during transporting, handling, and stacking pipes and installations to ensure that no damage whatsoever results to the pipe or coating. Storage Piping material must be stored by type, size and material specification. Materials will be supplied colour marked, to differentiate types/services of materials. Care must be taken to select and utilize special material such as that manufactured to NACE Std., ASME code and alloys for their required services only. Materials must be checked for their colour-coding Note: for Protection of All piping materials, they will be stored outdoors shall be supported off the ground. 3.7.2 Foundations structural work or civil work At this stage, the site is ready for the commencement of starting the construction of the plant structure. Through the construction of the various components of the plant structure a lot but similar activities take place which follow the pattern for the preparation for pouring concrete. The pattern is as follow: Concrete shuttering: which involves the use of shuttering materials mainly plywood for forming the required shape and size of the component being constructed. Reinforced steel preparation: which involves the sizing , cutting, and shaping of the reinforced steel bars to the required shapes and sizes, as well as the laying of these bars in the shuttering a specified in the structural design. Concrete pouring inside the formed shuttering (form work) so a to form the required skeleton of the structure. This is done through the use of a concrete batch plant which mix November 2009 33 Egyptian Natural Gas Co. (GASCO)
El Sadat – El Faium Gas Pipeline Environmental Impact Assessment 3 : project Description OHSAS 18 0 0 1 the concrete components (cement, gravel , sand, and water) internally in batch amounts which is then transported to pouring site through the aid of concrete trans-mixers and poured through the use of concrete pumps and cranes. The installations of the concrete works subject to exposure with the surrounding ground water table. Aggregates with different sizes and with an estimated sum total of 10,000 cubic meters for the use with different types of a concrete mixes to yield different required concrete strengths. 3.7.3 Trenching lowering and laying A trench will be dug from the running track to allow the pipeline to be buried. The width of the trench will be the width of the pipe plus 0.4 m. Sub-soil from the trench will be stored in loose piles on the opposite side of the working width to prevent mixing with top soil. The minimum cover on top of the pipeline will be 1.5 metres. The bottom of the trench will be uniformly graded and covered with sieved sand to prevent any damage to the pipe coating. The pipeline trench will be a minimum of 2 m from any existing pipeline. The trench will be left open for as short a time as possible before the pipeline is lowered into the trench. 3.7.4 Backfilling The pipeline will be lowered into the trench using wide, non-abrasive belts, and care will be exercised to avoid causing damage to the pipeline coating. In marshy areas, negative buoyancy will be created using a concrete coating. Warning tapes will be installed 30 cm below ground level. The trench will then be backfilled with layers of the original stored sub-soil. Once in the trench is filled the reinstatement of the whole working width begins. This involves ripping the sub-soil to rectify any compaction that may have occurred during construction and grading to the original contours. Topsoil will then be replaced across the working width to its original depth, will be graded carefully, and clean up operations will need to be completed within one week of backfilling. 3.7.5 Welding and Weld Inspection Welding Processes The following welding processes are acceptable: Shielded Metal Arc Welding (SMAW) November 2009 34 Egyptian Natural Gas Co. (GASCO)
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el fayoum Gas Pipeline - European Investment Bank

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