LAYING OF 6 INCH NB U/G STEEL PIPELINE TRIPURA

INSTALLATION OF CARRIER PIPE BY OPEN TRENCH METHOD (ALL KINDS OF SOIL)

(a) Receiving and taking-over as defined in the specifications, handling, loading, transportation and unloading of Owner supplied 3 - Layer PE coated carbon steel line pipes and Valves of size 2 inch and above from Owner designated stock-yard to Contractor's own stockyards/workshops/work-sites including preliminary activities, preparation of drawings, wherever required for crossings etc. including handling, stacking, stringing on the pipeline, Right-of-use / pipeline route alignment, carrying out inspection of company supplied materials including line pipes at the time of taking over, laying / installation of coated line pipe, associated fittings and accessories, including executing all works, "taking over", handling, including loading and unloading, transportation of Owner supplied materials other than line pipe from Owner's designated place(s) of issue to work site, arrangement of all additional lands required for Contractor's storage, fabrication, access for construction, procurement and supply of all materials (except Owner supplied materials), consumables, equipment, labor and other inputs, carrying out all temporary, ancillary, auxiliary works, ready for commissioning of pipeline as per drawings, Specifications, other provisions of Contract document and instruction of NEGDCL/VCS, including but not limited to carrying out the following works: (b) Surveying of Routes & detours required at the time of construction including marking the same in topographical sheet, preparation of AFC drawings showing survey details and submit the same to NEGDCL/VCS for review. (c) Staking and installation of construction markers, clearing, fencing, grubbing, cutting of trees, fulfilling all the requirements of various statutory / environment authorities to the entire satisfaction of concerned authorities, grading of work area, Shifting of all obstruction within the ROU/ pipeline route alignment viz electrical lines/poles, telephone lines/poles, co-ordination with concerned authorities and obtain permissions from these authorities. (d) Trenching to all depths by excavation in all types of soils including soft/hard rock, chiseling or otherwise cutting different types of pavement, footpath, roads etc. As required and storing excavated soil, reusable materials at designated area as directed by NEGDCL/VCS and to a width to accommodate the pipeline as per relevant standard/ specifications etc. (The minimum depth of the top of pipeline shall be 1.2 m or more from the finish of the stabilized grade level). Dewater of trenches if required as per site condition. Making trial pits as per instructions of EIC. (e) Carrying out repairs of pipe defects/replacement in case of irreparable defects and repairs of defects of pipe coating not attributable to Owner including defects / damages occurring during transportation/handling.

(f) Checking, cleaning, aligning, bending, cutting and beveling (as required) of pipes for welding and field adjustments including pipe fittings, welding, carrying out non-destructive testing of welds as required including 100% radiography and providing all requisite equipment, labor, supervision, materials, films, consumables, all facilities and personnel to process, develop, examine and interpret radiographs and other tests as required, carrying out repairs of welds joints found defective by NEGDCL/VCS, carrying out re-radiography and other tests as required on repaired joints. Providing PE warning mat over the pipeline etc. (g) Carrying out installation of carrier pipe at all crossings like roads/nallas/marshy area (Laying of Concrete Coated Pipes) etc. at designated depths by open cut (except at cased crossings or crossings carried out by HDD method). (h) Coating of field weld joints, long radius bends, buried fittings & valves etc. including supply of coating materials duly approved by Owner etc as per specification. (i) Counting the number and type of trees cut in presence of DFO/concerned authorities and keeping record thereof; stacking and handing over of all cut trees. (j) Installation/ lowering the pipeline in trench to required depth, supply & installation of 1.0 mm thickness HDPE yellow color warning mat over the pipeline along the complete route, padding around pipeline with suitable approved soil including supply of padding material, backfilling with available/ borrowed earth, approved excavated material and/ or other suitable soil by crowning. Compaction with jumping jack compactor and water at subsequent layers of 150mm or as directed by NEGDCL/VCS. All tiles / slabs/ curb stones etc. removed during excavation shall be placed properly. Roads, pavements, footpaths, etc. to be made motorable wherever pipeline is laid. (k) Supply and Installation of slope breakers, bank protection wherever required and as directed by Owner / Owner's Representative. (l) Taking of DGPS coordinate of all field joints , Reference Points with Landmarks & inform to Owner in the approved format. Coordinate shall be taken as per instrument approved by Owner . (m) Carrying out air cleaning, pigging, flushing, cleaning and hydrostatic testing of complete pipeline with quantity of corrosion inhibitor including pre-testing of designated sections complete as per specification and approved by NEGDCL/VCS to specified pressures indicated elsewhere and duration after stabilization as per specification, providing all equipment, pumps, fittings, instruments, dead weight tester, pressure recorder, thermocouples etc., and services, supervision, labor, consumables, water including supply of corrosion inhibitor, air, etc. as required, locating of leaks and rectification of defects, re-testing after rectification, dewatering after successful completion of hydrotesting of entire section and as approved by NEGDCL/VCS.

(n) All tie-in, including the tie-ins with adjacent section of the pipeline. (o) Protective coating of 450 micron thick two component epoxy / polyurethane (applied with the help of minimum three coats) including supply of materials duly approved by owner for all piping, Valves, fittings, structural steels etc. for buried installation and inside the valve pit. (p) Final clean - up and restoration of right -of -use and disposal of debris and surplus material to designated disposal areas and re-instating the area to its earlier state and as directed by NEGDCL/VCS. (q) Precommissioning activities like swabbing, drying of the complete pipeline network and the associated facilities being installed to the specified acceptance criteria as per Owner/Owner's Representative. (r) Maintaining the completed pipelines/ installation for any defect, failures during defect liability period (i.e. 12 months from date of commissioning of Pipeline). (s) Ensuring proper safety as per codes & standard practices during construction, cordoning off the work area, providing warning signs, barricading and proper tools & tackles, Equipping the workers with safety boots, helmets and florescent aprons & barricading as per enclosed drawings. The barricading is to be done throughout along the trench/ welding string. (t) Any other activities not mentioned/ covered explicitly above, but otherwise required for satisfactory completion/ operation/ safety/ statutory/ maintenance of the works shall also be covered under the scope of work and has to be completed by the Contractor within specified time schedule at no extra cost to Owner. The pipeline laying shall be done as per specification, code & standard & guideline by NEGDCL/VCS. (u) Preparation of as-built drawings, pipe-books (1 set of tracing on polyester film and 3 sets of as - built drawings and 1 soft copy and 6 copies of pipe book.) All the works shall be executed in accordance with the provision of contract including carrying out all temporary/ancillary/ auxiliary works required of the performance of the works and all other acts, deeds, matters and things necessary to make the pipeline ready for pipe commissioning activities.

Specified NB (inch) x Wall thickness in mm - Material of Construction

6" x 6.4 mm thick, API 5L Gr. X52, ERW / HFW / SMLS, with 3LPE Coated Line Pipe

4" x 6.4 mm thick, API 5L Gr. X52, ERW / HFW / SMLS, with 3LPE Coated Line Pipe

EXCAVATION - HARD ROCK

Excavation of hard rock, wherever hard rock of single piece exceeding 1.5m in any direction and removable only by pneumatic chisel / drill / rock-breaker. The rates are payable over and above the laying rates considered under SOR item specified as INSTALLATION OF CARRIER PIPE BY OPEN TRENCH METHOD (ALL KINDS OF SOIL)

SOFT SOIL / SAND FILLING (Preferably) - ROCK AREA/RCC DUCT