Pipelaying Tender-VOL IV - WorleyParsons.com

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EPMC SERVICES FOR REWARI – KANPUR PIPELINE SPECIFICATION FOR MAJOR WATER CROSSING BY TRENCHING 8. BACK-FILLING AND BANK PROTECTION 8.1 BACK FILLING Back-filling of the water-crossing section shall be performed as described in the following clauses: 8.1.1 The bottom of the waterway shall be reinstalled to its original level by back-filling the trench in a manner and with suitable material and as prescribed and approved by the authorities and HPCL / Worley Parsons. In case material other than the original spoil is required. this shall be supplied and applied by CONTRACTOR. Wherever boulders, rock, gavel and other hard objects are encountered, they shall not be placed directly on the pipe. Sufficient earth, sand or selected and approved backfill material shall be used as padding at trench bottom of 500mm thick and 500mm thick around and over the pipeline. Remaining portion of the trench will be filled with excavated or other material Wherever required by OWNER/CONSULTANT, CONTRACTOR shall cover the (nearly) back-filled trench with a layer of rock boulders as approved by OWNER/CONSULTANT over a width equal to the width of the excavated trench with an extra of 5m on either side at no extra cost to OWNER/CONSULTANT. 8.1.2 Back-filling progress of the trench shall be checked continuously, and a daily progress report shall be made and submitted to OWNER/CONSULTANT. 8.1.3 All embankments and/or dikes, bed and banks shall be reinstated to their original state and levels, unless otherwise prescribed in the drawings by the CONTRACTOR. 8.1.4 All remaining spoil deposits shall be cleaned by CONTRACTOR to the satisfaction of OWNER/CONSULTANT. 8.2 BANK PROTECTION CONTRACTOR shall back-fill the trenches in banks of major water crossings with soil/ crushed stone approved by OWNER/CONSULTANT. The fill at the banks shall be tamped firmly and reinforced as directed by OWNER/CONSULTANT to the satisfaction of authorities having jurisdiction thereof Quality of soil and size of crushed stones shall be as approved by OWNER/CONSULTANT. After the trench has been back-filled and during the clean-up works, the water crossing shall be cleaned across the whole width of ROW. Unless stipulated otherwise by the authorities or by OWNER/CONSULTANT, CONTRACTOR shall protect the banks of the major water crossing by using gravel and boulders filled embankment mattresses of galvanized iron wire to be laid over the back- filled, <strong>com</strong>pacted and graded banks. In case slope of the banks is 1:1 or more, bank protection shall be carried out using gabion baskets. Bank protection works shall be carried out by CONTRACTOR in accordance with the approved drawings. All n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for major water crossing by trenching\mh2145-c000-pl-spc-0017.doc MH2145-C000-PL-SPC-0017 RevA Page 15 of 20
EPMC SERVICES FOR REWARI – KANPUR PIPELINE SPECIFICATION FOR MAJOR WATER CROSSING BY TRENCHING materials required for such works shall be supplied by CONTRACTOR and all works carried out in accordance with approved specifications, approved drawings, instructions of OWNER/CONSULTANT and to the <strong>com</strong>plete satisfaction of authorities having jurisdiction. The width of the above protection shall be equal to the bank excavation and damage and further extending 10m on either side. The depth of the restoration on the slope shall be determined by the following levels: i. Base of trench ii. 5m shore of top of bank. 8.3 GAUGING Before final hydrostatic testing, CONTRACTOR shall gauge the diameter of the pipeline by passing a gauging (caliper) pig through the pipeline. The gauging plate shall have a diameter equal to 95% of the internal diameter of the pipe. n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for major water crossing by trenching\mh2145-c000-pl-spc-0017.doc MH2145-C000-PL-SPC-0017 RevA Page 16 of 20
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Pipelaying Tender-VOL IV - WorleyParsons.com

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