Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT33615 – Hot Water Pipe Distribution SystemIssue Date:September 25, 2012Page #:15 of 18B. Leak Detection System wiring is preinstalled in the piping system. Wirestandoffs (chairs) and specified electrical equipment to be provided by theCONTRACTOR.C. The CONTRACTOR shall electrically test the leakdetection wiring in each pipelength and fitting that has been installed by the piping manufacturer for thepresence of moisture, and continuity. The test shall be conducted with a devicecapable of applying a voltage of 1000 volts for a period of 1 minute, andproviding a reading of up to a minimum of 500 MX. The test parameters for eachpiece of preinsulated hot water pipe and hot water fittings shall be as follows:• Voltage Value. .................1000 V applied for minimum of 1 minute• Resistance. .......................Minimum of 500 MXThe results of the electrical test shall be marked on each pipe length or fitting withthe date of the test, test results and the individual performing the test and reportedto the OWNER’S Project Representative on the Alarm Wire Test Form –Resistance (see Appendix B) prior to the installation of each pipe section.D. Wire connections at pipe joints shall be mechanically crimped and soldered usingnoninsulated butt connectors, and flux core solder. The wires shall be evenlyspaced in the foam or plastic chairs and securely taped to the steel pipe insufficient quantity to prevent the wires from contacting the steel pipesE. Electrical equipment and connections required for the operation of the systemshall be installed as shown in the Plans.F. The CONTRACTOR shall take required special precautions to prevent moisturefrom entering the piping foam at the pipe joints. At no additional cost to theOWNER, the CONTRACTOR shall correct wiring joints that indicate thepresence of moisture.G. The CONTRACTOR shall electrically test all wiring, equipment, and theoperation of the newly constructed portion of the leakdetection system. Theresults of the electrical tests shall be documented and reported to the OWNER’SProject Representative prior to the foaming and closing of the pipe joints. Contactthe OWNER’S Project Representative to verify all alarm loop wiring isacceptable.H. Upon completion of the insulation joints by the CONTRACTOR, the “PipelineAlarm Loop Test” will be conducted by the OWNER’S personnel and witnessedby the CONTRACTOR. The Pipeline Alarm Loop Test shall consist of thefollowing requirements:1. Upon completion of the wire connections and insulation joints by theCONTRACTOR, a final test will be conducted by the Owner’s representativeHOT WATER PIPE DISTRIBUTION SYSTEM3361515