| 2 | 20 | HDD INSTALLATION Design, detailed engineering, installation of pipeline at specified minimum depth by Horizontal Directional Drilling (HDD) method; Complete work for the crossing (between the limits, as per the approved drawing, procedure & design) including mobilisation & de-mobilisation of all equipment & accessories at site(s), supply of all materials as per the `Scope of Supply' and all consumables, equipment, manpower & other resources and arranging the required land for site preparations and execution of, but not limited to the following works in accordance with the specifications, drawings, as per the provisions of the contract document and instructions of the Engineer-in-Charge - Interpretation of data of hydrological / geo-technical surveys furnished by the Owner, carrying out fresh topographic survey of the river bed & developing new bed profile drawing for the crossing location, carrying out additional surveys required for collecting data relevant to design and construction of the crossing, performing all engineering & design calculations, preparation of all necessary construction drawings for approval of the Owner as per the provisions of contract document, preparation of detailed construction method statement and design analysis. - Taking delivery and transportation of Owner-supplied 3LPE coated pipes to the work site from designated stockpile location, inspection of the coated pipes visually and/or with holiday detector for defects, including arranging all necessary intermediate storage area required thereof till the pipes are installed in permanent position. - Complete site preparation including arranging of required land, setting up of fabrication yard, preparation of temporary arrangement for pipeline stringing, launching etc. - Carrying out repair of pipe defects, replacement in the case of non-repairable defects and repairing damages to pipe coating including defects/ damages occurring during transportation and handling. - Pre-construction surveys and collection of all necessary data. - String preparation including repair of pipe and pipe coating defects, welding, non-destructive testing of welds including 100% radiography (by X-ray), supply of films & all equipment and providing all facilities to Owner's representative(s) for examining radiographs, repair of defects in the welds and re-testing etc. - Coating of the field joints of the pipe string to be installed by HDD method with DIRAX heat shrink sleeves of M/s Raychem's make, DDX(TM) Directional Drilling Kit of M/s Canusa or of any other approved make used for HDD crossings. - Repair of all coating damages in the pipe section to be laid by HDD method by full encirclement sleeves using suitable cut sections of approved quality of heat shrink sleeves of M/s Raychem make, DDX(TM) Directional Drilling Kit of M/s Canusa or of any other approved make. - Fabrication of 89mm OD steel conduit with an inner duct of 40mm OD HDPE pipe for OFC (wherever OFC has to be laid along with the carrier pipeline). - Supply & fixing of easy to install heat shrinkable duct end caps for HDPE conduit for OFC (wherever OFC has to be laid along with the carrier pipeline). - Carrying out air cleaning, gauge pigging and pre-installation hydrostatic testing of the complete pipeline string, as per the specifications, including repair of defects and retesting etc. - Installation of the pipeline / pipeline and OFC conduit as a bundle crossing below the river bed by single horizontal directional drilling operation to the correct profile as per the approved drawings. - Carrying out post-installation hydrostatic testing of HDD pipe string (along with transition pipe section). - Carrying out post-installation coating survey as per approved procedure. - Restoration, clean-up and disposal of drilling fluid, waste and all other surplus materials etc. - Transportation of surplus Owner-supplied pipes to the designated stockpile location of the Owner. - Preparation of as-built drawings and other records etc. - All other works not specifically listed herein, but required as per specifications, drawings, provisions of the contract document, calculations and construction method statement, leading to successful completion of the works. Note: Payment shall be released in stages as stipulated in the Special Conditions of Contract. \" | | | |
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