Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT33615 – Hot Water Pipe Distribution SystemIssue Date:September 25, 2012Page #:13 of 181. Excavated material that is not removed from the immediate site of the workshall be kept trimmed up so as to cause little inconvenience to the owners ofneighboring property and to the public as possible. Gutters, driveways, andstreet crossings must be kept clear except when the latter is unavoidablyobstructed by an open trench.2. Excavated materials, including, but not limited to, pipe, pavement, concreteand concrete rubble, and masonry units, which is unsuitable for backfill, andall excavated material that has not been used for backfill shall, uponcompletion of the project, be removed from the site of the work by theCONTRACTOR at his own cost and expense.C. The CONTRACTOR’S attention is directed to Section 02200 – Earthwork forspecific requirements as they pertain to bedding and backfill materials.D. Carefully inspect each pipe unit. Remove all foreign matter and dirt from insidethe pipe. Damaged units will be rejected or repaired to the satisfaction of theOWNER’S Project Representative.E. Install the piping to the alignment and grades indicated on the Plans or as requiredby the OWNER’S Project Representative. Support each pipe on bedding materialas indicated on the Plans and have firm bearing along its entire length.Temporary supports may be used to raise the piping or to allow rotating the pipeto facilitate welding joints. Bedding material may be excavated at pipe joints toprovide clearance for welding.F. Steel pipe ends shall have flat ends or be properly beveled and aligned and spacedfor welding. All welding on pipes, fittings, and valves to be done by personnelwho have passed an approved competence test and have been certified. Gaswelding or electric arc welding may be used and the type of rods and filler usedshall be selected to match the base metal alloy analysis.G. Removal of a portion of pipe to facilitate welding of the joint and then replacingthe cut out section, sometimes referred to as “fish mouth” or “window” welding,will not be permitted.H. The ends of the pipe in the trench not being fitted or welded shall be securelycapped at all times to prevent the entrance of foreign matter.I. Pipe shall not, under any circumstances, be placed in water or allowed to becomesubmerged in a flooded trench.3.4 FIELD QUALITY CONTROL (WELD TESTING PROCEDURES)HOT WATER PIPE DISTRIBUTION SYSTEM3361513