GAIL (India) Limited
GAIL (India) Limited GAIL (India) Limited
1111.0 LINEAR DIFFUSER ;Liner diffuser shall be extruded aluminium construction multislot type with air patterncontrolled provided in each slot. Supply air diffusion shall be provided with volumedamper in each slot of the supply air diffuser. Plenum shall be provided for each supply airdiffuser.The Material of Grilles shall be as follows:i. Al1 grilles shall be selected in consultation with the Architect/Consultant.Different spaces shall require horizontal or vertical face bars, and different width of marginframes.ii.iii.iv.All grilles shall have a soft, continuous rubber gasket between the periphery of theregisters and the surface on which it has to be mounted. The effective area of the registersshall not be less than 75 percent.Grilles shall be adjustable pattern as each grille bar shall be pivotable to providepattern with 0 to 100 deg horizontal arc and upto 30 deg C deflection up or down Barsshall hold deflection settings under all conditions of velocity and pressure. Extrudedaluminium grilles shall have fixed bars.Bars longer than 45cm shall be reinforced by set-back vertical members of approvedthickness.The material thickness of grills, diffuser, damper shall be as follows :Diffuser MS Aluminiuma) Frame 20 gauge 18 gaugeb) Louvers 20 gauge 18 gaugeGrills:a) Frame Louv 20 gauge 26 gau 18 gauge 24 gb)V.C. Damper :a) Frame 20 gauge 1 8 gaugeb) Louver 26 gauge 24 gaugev. Fresh air intake and Extract louvers:All the louvers shall be rain protection type and shall be fabricated from extrudedaluminium section. The louvers shall additionally be provided with heavy duty expandedmetal (aluminium - alloy) bird screen.12.0 TESTING & BALANCING:After the installation of the entire air distribution system is completed in all respects, allducts shall be tested for air leaks before painting the interiors of conditioned spaces airdistribution system shall be allowed to run continuously for 48 hours for driving awayany dust or forein material logged within ducts during installation.
12D) THERMAL/ACOUSTIC INSULATION. GENERAL:Scope of this specification comprises of supplying, installing, testing and commissioningof insulation on duct, pumps, chilled water piping, chillers, expansion tank, AHU roomand duct lining.1.0 DUCT INSULATION:Resin bonded, glass wool, prelaminated with aluminium foil. The thermal conductivityof glass wool shall not exceed 0.024 Kcal/hr sqm deg C (0.19 BTU in/Hr Sq ft deg F at10 deg C - mean temperature and density shall not be less than 48 kg/m3.1.1 Thickness of Insulation:a. For Duct passing through return air areas = 25mmb. For Duct passing through non air conditioned space = 50mmc. Treated fresh air duct = 50mmd. For exposed duct = 50mm1 2 Application: (For unexposed duct)- Clean the surface of duct and apply coal of Black Japan paint of approvedmake applied @ 7 Sq mt./Kg.- Fix the insulation material of required thickness before adhesive dries up. Alllongitudinal joint will have an over lap of minimum 50 mm followed bycovering firmly by 75 mm width aluminium sticking tape to seal all transverse& longitudinal joints.Where the duct is exposed to atmosphere material shall be same as for ducts not exposed toatmosphere but without aluminium foilApplication: (For exposed duct)a. Cleaning the surface of ducts with wire brush to remove dirt, rust etc.b. Applying a coat of adhesive.c. Fixing the glass wool insulation and tied with PVC strap of 25mm widthd. Cover the insulation with fire retardant quality polythene lined hessian of 500gand seal the joint with black Japane. Fixing 24 x 3/4" Hexagonal wire netting tied with G.I. wire.f Finally applying sand cement plaster in ratio 1:3 in two layers each 10mmthick.g. Paint it to required colour with brush.
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1111.0 LINEAR DIFFUSER ;Liner diffuser shall be extruded aluminium construction multislot type with air patterncontrolled provided in each slot. Supply air diffusion shall be provided with volumedamper in each slot of the supply air diffuser. Plenum shall be provided for each supply airdiffuser.The Material of Grilles shall be as follows:i. Al1 grilles shall be selected in consultation with the Architect/Consultant.Different spaces shall require horizontal or vertical face bars, and different width of marginframes.ii.iii.iv.All grilles shall have a soft, continuous rubber gasket between the periphery of theregisters and the surface on which it has to be mounted. The effective area of the registersshall not be less than 75 percent.Grilles shall be adjustable pattern as each grille bar shall be pivotable to providepattern with 0 to 100 deg horizontal arc and upto 30 deg C deflection up or down Barsshall hold deflection settings under all conditions of velocity and pressure. Extrudedaluminium grilles shall have fixed bars.Bars longer than 45cm shall be reinforced by set-back vertical members of approvedthickness.The material thickness of grills, diffuser, damper shall be as follows :Diffuser MS Aluminiuma) Frame 20 gauge 18 gaugeb) Louvers 20 gauge 18 gaugeGrills:a) Frame Louv 20 gauge 26 gau 18 gauge 24 gb)V.C. Damper :a) Frame 20 gauge 1 8 gaugeb) Louver 26 gauge 24 gaugev. Fresh air intake and Extract louvers:All the louvers shall be rain protection type and shall be fabricated from extrudedaluminium section. The louvers shall additionally be provided with heavy duty expandedmetal (aluminium - alloy) bird screen.12.0 TESTING & BALANCING:After the installation of the entire air distribution system is completed in all respects, allducts shall be tested for air leaks before painting the interiors of conditioned spaces airdistribution system shall be allowed to run continuously for 48 hours for driving awayany dust or forein material logged within ducts during installation.
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