Pipe Installed in Trenches Sample Clauses

Pipe Installed in Trenches. Where pipelines are to be constructed in trench the contractor shall leave open no more than a 200 meter run of pipe trench ahead of the pipe laying operation, at any time, unless otherwise approved by the Employer’s Representative. Pipelines shall be constructed in lengths with a separate full-time gang working on each length. The work on lengths may proceed concurrently. Excavation for the pipeline in any one length shall not at any time proceed more than 1 km beyond the end of a hydraulically tested, completed and backfilled length of pipeline, unless otherwise approved by the Employer’s Representative. The exposed joints between tested sections shall be disregarded in the above definition. MS pipelines shall be laid in accordance with IS 5822 unless otherwise specified herein. Each trench shall be excavated to the minimum width necessary to ensure an adequate working space. Considering this requirement, trench width for various pipe sizes shall not be more than that specified below: Pipe Diameter (mm) Allowable Trench Width (m) 100 to 200 0.80 250 to 400 0.90 500 to 700 1.20 800 to 1,000 1.50 Over-excavation outside the allowable trench widths on account of any reason shall not be allowed for payment. Where bends are made by deflecting pipes at joints the trenches shall be deflected also to permit this operation. The sides of the trenches shall be cut vertical, and shall be protected against caving by timbering, sheeting or shoring, as required without any extra cost. The formation of trenches of pipelines shall be even and free from rock and other protrusions. Pipes shall be laid in a dry trench. If the formation of the trench lies below the water table the contractor shall install a dewatering system with the approval of the Employer’s Representative. Dewatering shall continue until all work below the water table has been completed or as otherwise directed by the Employer’s Representative. The quoted rates for pipe laying shall cover the dewatering charges wherever required. No metal tools or heavy objects shall be permitted to come into contact with the pipes or fittings. External coated pipe shall be handled at all times with wide non-abrasive canvas, rubber or leather straps or other equipment to prevent damage to the coating. The use of chains, wire slings, or any other handling equipment found to be injurious to the coating shall not be permitted. The timber or skids used to support the coated pipe prior to lowering into the trench shall be prop...
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