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| 1 | SUPPLY, INSTALLATION, TESTING AND COMMISSIONINGOF TEMPORARY CATHODIC PROTECTION SYSTEM forLocation :- DULIAJAN TO RUPKALIYA 12” PIPELINE PROJECT( PCPwork,12\" dia. 4 KM.). |
| 2 | Survey, Design, detail engineering, Manufacturing, Inspection/FAT (Factory acceptance test), supply, Packing, transportation to site, storage, installation, testing & commissioning of the temporary Cathodic protection system using Mg(Min 5.0 Kg Each) for CP system / Zn galvanic anodes for earthgrounding to protect the external surface 3LPE Coated pipelineagainst corrosion for a design life of minimum 2 year or till commissioning of PCP system as per standard specificationenclosed with the tender for temporary cathodic protection system, approved design document, data sheets & drawings.Scope shall also include but not limited to the following for completion of jobs: |
| 3 | Measurement of soil resistivity along the right of way of the main pipeline (At every 500mtr Interval and 1.5, 2.5 & 3.5 mtr depth) & collection of soil & water samples along ROW at depth of 1M, 2M & 3M at every 5 km interval (Min 03 sample at each location) for its chemical & microbial analysis along the pipeline route as per specification for corrosion survey . |
| 4 | Collection of additional data related to cathodic protection along the right of way of pipeline as per standard specifications. |
| 5 | Design, Detailed Engineering, Preparation of Design Document, Preparation of Test station schedule & Bill of Material as per the corrosion survey & Chemical analysis of Soil / Water samples for Temporary Cathodic Protection system. |
| 6 | Supply, installation, testing & commissioning ofMg(Min 5.0 Kg Each) for CP system / Zn galvanic anodes for earthgroundingas per the standard specification-The weight of the Mg Anode & the total nos. of anodes shall be calculated as per the corrosion survey, soil chemical analysis, total weight and current requirement of the pipeline section. However, Min one anode is to be installed at every one KM with test station. |
| 7 | Supply, Installation, Testing & commissioning of Test stations (Big Size & Normal Size) weather proof (IP-55) as per specification & enclosed drawings. |
| 8 | Supply, installation, testing & commissioning of one set of spark gap arrestor 100 kA (Solid State) across each insulating joint provided at terminals as per scope of work / specification. The un-protected/above ground pipeline shall be earthed through GI earth electrodes with separate earth pit. The resistanceof grounding shall be limited to 2 ohms max. |
| 9 | Supply, installation, testing & commissioning one set of polarization cell (Solid state) with zinc anode at all high tension electrical power transmission line/equipments /railway tractions (all 66 KV & above) crossing or running parallel to the pipeline for grounding purpose as per specification for existing & proposed HT lines. The rating of the cell shall depend upon anticipated fault current & ground bed resistance at the location of installation and the calculation of the same shall be furnished to Clint for review & selection of rating of the Polarisation Cell. However, the rating of polarisation cell shall not be less than 3.7 KA @ 30 Cycle & number of 20 kg net weight zinc anode shall not be less than two. If required Zn Ribbon anode (Dia min. 12x14 mm with back fill in trench)/ pre-packed AC mitigator wire of MATCOR or equvalent make aslo be used for the grounding purpose to get lower grounding resistance (for soil resistivity higher than 25 Ohm-Cm). The resistanceof grounding shall be limited to 2 ohms max. |
| 10 | Earthing of above ground catholically unprotected pipeline at stations/Metering skids etc, the earth electrode shall be 65 mm dia, 4.5 mm thickness & 3000mm long. |
| 11 | Supply, installation, testing & commissioning of external electrical resistance Probe (02 no. ER probe with 1 no. ER probe reading instrument) probes utilizing the electrical resistance technique shall be provided along the pipeline at marshy / vulnerable locations to monitor the external corrosion activity on the pipeline. Location of external ER probe shall be decided during detail engineering. |
| 12 | Supply, installation, testing & commissioning of Polarisation coupons each of total area of 100mm x 100mm having one side exposed area of 25 mm x 25 mm without permanent reference cell shall be provided along the pipeline at marshy areas and at vulnerable locations to monitor the external corrosion activity on the pipeline as per enclosed standard specification. Location of external Polarisation coupons & Number of magnetic devices for operation of magnetic switch shall be decided during detail engineering in consultation with client. The works related to collection of approximately 2-5 m of pipeline material (In pieces of 300 to 1000mm length) for fabrication of Polarisation coupons is in the scope of the Contractor. |
| 13 | Supply, laying of HDPE sheets (1200mm wide, 6mm thick) between the pipeline and the other CP protected foreign pipelines at the crossing locations for providing electrical isolation. |
| 14 | Bonding of pipeline with foreign pipeline crossing or parallel run as per the scope of work. |
| 15 | Supplying, laying, termination, Glanding, ferruling & testing of all the cables of TCP system, Cu-Conductor, XLPE insulated, PVC sheathed, Armd/Unrmd (1Cx6 mm2, 1Cx10 mm2, 1Cx25 mm2) as required. |
| 16 | Cable to pipe connection by thermit welding/Pin brazing (for charged pipeline) for 35, 25,10 ,6 sq.mm copper cable including excavation and exposing piping , recoating with epoxy, testing etc. |
| 17 | PSP Monitoring on monthly basis of the TCP system till commissioning of the permanent cathodic protection system or closure of contract, whichever is earlier. |
| 18 | All civil/ structural works related to TCP system including supply of bricks, cement & steel etc. required for completion of the system with other miscellaneous works specified in scope of work. |
| 19 | Engineering TBE/PO/VDR |
