GAIL (India) Limited

132.0 ACOUSTIC LINING OF PACKAGE UNIT ROOM AND LINING OF DUCTS:For acoustic lining of AHU room/plant room and duct lining material shall be resin bondedglass wool of density not less than 32 kg/m3. All duct upto a distance of 5m from AHU outlet oras shown in the drawing shall be acoustically lined from inside2 1 Application: 2.1.1 Duct Lining:- Clean the inner surface of duct which is to be lined with wire brush to remove thedirt.- Fixing GI frame Z section of 24 g of 25 mm x 25 mm x 25 mm size at 600mmdistance screwed with the duct and making size as per requirement- Apply a Black Japan paint over the frame/duct.- The adhesive shall be non flammable, odorless and having vapour barrier property- Fixing insulation material of specified thickness and covered with K. P Tissue paperand then covering the material with 28 g perforated aluminium sheet having 2 mmdia perforation at 3 mm center to center distance with the help of self tapping screwsand shall be neatly finished to give true surface finish.Specification for acoustic lining of Package Unit Room Walls/ceiling :For acoustic lining of Package Unit Room insulating material shall be resin bonded glass wool ofdensity 32kg/m3 and thickness 25 mm/50mmClean wall/ceiling surface which is to be acoustically linedFixing GI frame Z section of size 25 x 45 x 25 x mm, or of equal insulation thickness as specified, tothe wall/ceiling with screw/bolts.Apply a 2 coats of Black Japan Paint on wall/ceilingResin bonded glass wool of 25mm/50mm thickness shall be fixed in GI frame of 600mm x 600mmdimension, covered with R.P TissueCovering the material with 24 gauge perforated aluminium sheet should have 3mm dia perforation at 4to 6mm center to center with self tapping screws.- All joints of perforated aluminium sheet should be covered with 20 mm aluminiumcurved beading