GAIL (India) Limited

5e. After the refrigerant piping installation has been completed the refrigerant piping systemshall be pressure tested using, Freon mixed with nitrogen/carbondioxide at a pressure of20 Kg per Sq. cm (High side) and 10 Kg per Sq. cm (Low side) pressure shall bemaintained on the system for a minimum of 12 hours. The system shall then beevacuated to a minimum vacuum of 70 cm. of mercury and held for 24 hours, duringwhich time, change in vacuum shall not exceed 12 cm of mercury. Vacuum shall bechecked with vacuum gaugef. All refrigerant piping shall be installed strictly as per the instructions andrecommendations of air conditioning equipment manufacturers.9.0 TESTING & BALANCING:a. All piping shall be tested at field, test pressure of atleast two and half timesthe maximum operating pressure, but not less than 24 hours. All leaks and defectsin joints revealed during the testing shall be rectified and gotten approved at site.b. Piping repaired subsequent to the above pressure test shall be retested in the samemanner.c. System may be tested in sections and such sections shall be securely capped, thenretested for entire system.d. The contractor shall give sufficient notice to all other agencies at site, of hisintention to test a section or sections of piping and all testing shall be witnessedand recorded by Owner's site representative.e. The contractor shall make sure that proper noiseless circulation of fluid isachieved through all coils and other heat exchange equipment in the systemconcerned. If proper circulation is not achieved the contractor shall rectify thedefective connection. He shall bear all expenses for carrying out the aboverectifications, including the tearing up and refinishing of floors and walls asrequired.f. The contractor shall provide all materials, tools, equipment, instruments, servicesand labour required to perform the test.g. Complete certified report shall be submitted for evaluation and approval toEngineer in charge. Upon approval, four copies of the balancing report shall besubmitted with complete drawings and documents.