GAIL (India) Limited
GAIL (India) Limited 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.
6B) AIR DISTRIBUTION SYSTEM:1.0 GENERAL:Supply, fabrication, installation and testing of all sheet metal/aluminium ducts & supply,installation, testing and balancing of all grilles, registers and diffusers, in accordancewith these specifications and the general arrangement shown on the drawingsDuctwork shall mean all ducts, casings, dampers, access doors, joints, vanes, stiffeners,hangers and supports etc.All ducts shall be fabricated from galvanised steel sheets of the following thickness asindicated in schedule of quantities & as described in the IS:655 with latest edition.2.0 RECTANGULAR DUCT:Dimensions Gauge Gauge Type of Type of Angles/of Ducts G.I. Aluminium Joints Bracings (Epoxy coated)Upto 600 24 22 G.I. Flange at 2.5 Cross Bracings0.63mm 0.8 mm Centre601 to 750 24 22 25 x 25 x 3 mm angle ir25 x 25x 3mm MS angles0.63mm 0.8 mm with 6mm dia nuts & bracing at 1500 mm fromboltsjoints751 to 1000 22 20 25x25.\3mm angle iron 25 x25 x3mm MS0.8mm 1.00 mm with 6mm dia nuts angle bracing at 1500mm1001 to 1500 220.8mm1501 to 2250 201.00 mm2250 and abo 181.20 mm201.00 mm161.4 mm141.60 mmand bolts.40x40x5 mm angle ironwith 8mm dia nuts andbolts.from joints.40 x 40 x 3mm MSangle bracing at1500mm from joints.50x50x3 mm angle iron 40 x 40 x 3mm MS anglecross braced diagonally bracing at 1200mm fromwith 10 mm dia nuts & joints or 40x40x3 mm MSbolts at 125 centre. angle diagonal bracing.50x50x6 mm angle iron 50 x 50 x 3mm MS anglemm nuts & bolts at 125 bracing at 1200mm fromcentre.joints or 50x 50x 3mmMSangle diagonal bracing.Sheet metal ducts shall be fabricated out of galvanized steel sheets conforming to BIS 655,BIS 277, BIS 737 & SMACNA Sheets used shall be produced by Hot dip process andgalvanizing shall be Class VIII- Minimum Average Coating 120 gm/sq.m as per BIS 277: 1992.3.0 HANGERS FOR DUCT (HITECH SUPPORTS PATTERNS SHALL BE USED):Duct Size(mm)Spacing(M)Size of MS angle(mm x mm)(Epoxy coated)Upto 750 2.5 40 x 3 10751 to 1500 2.0 40 x 3 121501 to 2250 2.0 50 x 3 152251 to above 2.0 50 x 3 15Size of GI roddia (mm)
- Page 75 and 76: 743.6 As far as possible no GI pipe
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- Page 85 and 86: 844.5.1 LEADING IN C.I. PIPESThe le
- Page 87 and 88: 865.2.4 TRENCH FILLING OF G.I. PIPE
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- Page 97 and 98: 6Ceiling rose: a) A ceiling rose or
- Page 99 and 100: 8The consuming device circuit shall
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- Page 103 and 104: 12Mechanical operation indicators s
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- Page 107 and 108: 16CHAPTER 31. Scope:LAYING OF CABLE
- Page 109 and 110: 183.5.4 Provision shall be made to
- Page 111 and 112: 20such that it shall be able to rea
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- Page 115 and 116: 245.3.2 Installation: The transform
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- Page 123 and 124: 2TECHNICAL SPECIFICATIONSA) AIR COO
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- Page 137 and 138: 162.0 INSULATIONManufacturer Materi
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- Page 147 and 148: 7All joinery to be varnished/spirit
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6B) AIR DISTRIBUTION SYSTEM:1.0 GENERAL:Supply, fabrication, installation and testing of all sheet metal/aluminium ducts & supply,installation, testing and balancing of all grilles, registers and diffusers, in accordancewith these specifications and the general arrangement shown on the drawingsDuctwork shall mean all ducts, casings, dampers, access doors, joints, vanes, stiffeners,hangers and supports etc.All ducts shall be fabricated from galvanised steel sheets of the following thickness asindicated in schedule of quantities & as described in the IS:655 with latest edition.2.0 RECTANGULAR DUCT:Dimensions Gauge Gauge Type of Type of Angles/of Ducts G.I. Aluminium Joints Bracings (Epoxy coated)Upto 600 24 22 G.I. Flange at 2.5 Cross Bracings0.63mm 0.8 mm Centre601 to 750 24 22 25 x 25 x 3 mm angle ir25 x 25x 3mm MS angles0.63mm 0.8 mm with 6mm dia nuts & bracing at 1500 mm fromboltsjoints751 to 1000 22 20 25x25.\3mm angle iron 25 x25 x3mm MS0.8mm 1.00 mm with 6mm dia nuts angle bracing at 1500mm1001 to 1500 220.8mm1501 to 2250 201.00 mm2250 and abo 181.20 mm201.00 mm161.4 mm141.60 mmand bolts.40x40x5 mm angle ironwith 8mm dia nuts andbolts.from joints.40 x 40 x 3mm MSangle bracing at1500mm from joints.50x50x3 mm angle iron 40 x 40 x 3mm MS anglecross braced diagonally bracing at 1200mm fromwith 10 mm dia nuts & joints or 40x40x3 mm MSbolts at 125 centre. angle diagonal bracing.50x50x6 mm angle iron 50 x 50 x 3mm MS anglemm nuts & bolts at 125 bracing at 1200mm fromcentre.joints or 50x 50x 3mmMSangle diagonal bracing.Sheet metal ducts shall be fabricated out of galvanized steel sheets conforming to BIS 655,BIS 277, BIS 737 & SMACNA Sheets used shall be produced by Hot dip process andgalvanizing shall be Class VIII- Minimum Average Coating 120 gm/sq.m as per BIS 277: 1992.3.0 HANGERS FOR DUCT (HITECH SUPPORTS PATTERNS SHALL BE USED):Duct Size(mm)Spacing(M)Size of MS angle(mm x mm)(Epoxy coated)Upto 750 2.5 40 x 3 10751 to 1500 2.0 40 x 3 121501 to 2250 2.0 50 x 3 152251 to above 2.0 50 x 3 15Size of GI roddia (mm)
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