Specifications - City of Montpelier, Vermont

Montpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Title:APPENDIX A – Welding and Testing RequirementsPage #:21 of 222.6.1.2 The CONTRACTOR shall be responsible for all costs incurredfor the installation of any permanent attachment as defined inParagraph 2.6.1.2.7 The water shall be allowed to stand under pressure a sufficient time to allow theescape of air from any air pockets.2.8 The pressure should then be increased to 375 psi for primary piping and 225 psifor secondary piping per ANSI B31.1, Para. 137.3.4.2.9 The test pressure shall be maintained for at least one hour without any pressuredrop or leakage.2.10 After successful completion of the pipeline hydrostatic test, the pressure shall bereduced to 225 psi and maintained at that pressure for the valve acceptance test.This test involves the temporary removal of the blind flanges and any screw-oncaps/plugs to verify a bubble tight seal (per manufacturer's specifications) of allservice entry valves including but not limited to: Main service entry valves, shuntvalves, air/drain valves, DP sensor/control valves or chamber/isolation valves.The valve acceptance test shall be performed by the CONTRACTOR andwitnessed by the ENGINEER.3.0 ACCEPTANCE STANDARDS3.1 If, in the judgment of the ENGINEER, it is impractical to follow the foregoingprocedure exactly for any reason, required modifications in procedure shall bemade.3.2 There shall be no leakage allowed in the piping system.3.3 The CONTRACTOR shall be responsible for the ultimate leak tightness of thepiping system.3.4 After successful completion of hydrostatic testing, absolutely no welding will beallowed on the completed section of the piping system without additionalhydrostatic testing being performed on those welds.4.0 RE8EXAMINATION OF REPAIRS4.1 If a section should fail to pass the leakage test, the section must be vented anddrained of all water and all repairs made in accordance with approved repairprocedures. No repairs will be made with water in the piping system unlesspreviously authorized by the OWNER in writing.4.2 The section shall then be retested by the above procedure, except that weldedjoints previously accepted need not be re-examined.5.0 RECORDS AND SUBMITTALS5.1 Paragraph 1.3 Hydrostatic testing procedure5.2 Leak Test Examination results shall be reported on a Hydrostatic Test Reportform (see Appendix B) containing the following data:5.2.1 Client Name5.2.2 Contractor Name5.2.3 Date of ExaminationAPPENDIX APage A21