GAIL (India) Limited
GAIL (India) Limited GAIL (India) Limited
96.0 SPLITTERS AND DAMPERS:All dampers shall be opposed blade type dampers of robust construction and tight fitting.They shall be made of G.S. sheet minimum 16 g thick and shall have brass bushes. Thedesign, method of handling, and control shall be suitable for the location and servicerequired.Dampers shall be provided with suitable links, levers and quadrants as required for theirproper operation control or setting devices shall be made robust, easily operatable andaccessible through suitable access doors in the ducts. Every damper shall have anindicating device clearly showing the damper position at all times Handles will beprovided with extended arms to account for insulation thickness.Dampers shall be placed in ducts and at every branch supply or return air ductconnection, whether or not indicated on the drawings, for the proper volume control andbalancing of the system.7.1 FIRE DAMPER:All Supply/Return air duct or path at AHU room wall or slab crossing shall be providedwith fusible link type fire damper The fire rating shall be of 90 minutes fire damperblades and outer frame shall be formed of 1.6 mm galvanised sheet steel. The damperblade shall be pivoted spindles in self lubricated bronze bushes, stop seals shall beprovided on top and bottom of the damper housing made of 16g galvanised sheet steel.Side seal shall be provided to preventing fire leakages7.2 FLEXIBLE DUCT CONNECTION :The Flexible Connection should be made of TF quality fire retardant double canvas orimported fabric of fibreglass weave having silicone rubber coating, as mentioned in theschedule of quantities. Flexible connections shall be air tight & water proof andwithstand high temperature application,' non flammable type and does not supportcombustion. There shall be extruded Angle aluminum frame at both ends for connection8.0 MOTOR1SED COMBINATION SMOKE & FIRE DAMPER :All supply/return air duct or path at AHU room wall or slab crossing shall be providedmotorised combined smoke and fire damper The fire rating shall be of 90 minutes firedamper blades and outer frame shall be formed of 1.6mm galvanised sheet steel. Thedamper blade shall be pivoted spindles in self lubricated bronze bushes, stop seals shallbe provided on top and bottom of the damper housing made of 16g galvanised sheetsteel. Side seal shall be provided to preventing fine leakages. Fire damper shall be keptopen during normal mode with the help of 230 V operated electric actuators spring toproviding maximum air passage without creating any noise or actuated either throughelectric actuator or through UL stamped electro-thermal link. The actuator shall beenergized with the help of a single from smoke detector installed in AHU room / RAduct/damper. The fire damper shall also close due to temp rise in SA Ducts through theelectric temp sensor factoy set at 165 deg F, micro switches with bakelite base will beprovided to stop fan motor & give open & close singnal at remote panel in case ofmotorised damper
10ACTUATOR:In case of motorised smoke -cum-fire damper it shall have its own panel which willincorporate necessary circuit required to stop down voltage available from UPS oremergency power supply to show the status of damper (open or closed), to allowremoting testing of damper & indication in event of damper clouser due to signal fromsmoke sensor/temp sensor & reset button Additional terminal will be provided to havesingle (sound beep or visual)in central control room. The fire damper shall be mounted infire rated wall with a duct sleeve 400mm/500mm long depending upon the wallthickness. The sleeve shall be factory filled of fire damper the joints at sleeves end shall beslip on type minimum thickness of GI sheet shall be 18g. The fire damper shall beinstalled in accordance with the installation method recommended by the manufacturer9.0 SUPPLY AND RETURN AIR GRILLES:Supply and return air grilles shall be MS or anodized extruded aluminium constructionwith individually adjustable bars as shown on drawings and indicated in schedule ofquantities. Supply air grilles shall be generally double deflection type, with removablekey operated volume control dampers. Return air grilles shall be generally doubledeflection type similar to supply air grilles but without dampers. All supply and return airgrilles behind wooden grilles shall be single deflection type with one way bars only, thesupply air grilles being provided with removable key operated volume control dampers.Mild steel supply and return air grilles shall be factory coated with rust resistant primerand shall be finished with two coats of paint as per client's choice. Aluminium supplyand return grilles shall be powder coated and to have colour of client's choice or extrudedaluminium as per bill of quantities.10.0 SUPPLY AND RETURN AIR DIFFUSERS:\Supply and return air diffusers shall be shown on the drawings and indicated in scheduleof quantities. The supply air diffuser shall be provided with removable key operativevolume control dampers. Mild steel diffusers/dampers shall be factory coated with rustresistant primer. These shall be finished with two coats of paint as per client's choiceAluminium supply and return air diffusers shall be powder coaled and to have colour ofclient's choice or shall be extruded aluminiumi. Round or Rectangular Diffusers:Supply/return air linear diffuser shall be MS or Extruded aluminiumconstruction, square, rectangular, or round diffusers with flush fixed pattern oradjustable flow pattern. Diffusers for different spaces shall be selected inconsultation with the Architect/Consultants Supply air diffusers may beequipped with fixed air-distribution grids, removable key-operated volumecontrol dampers, and antismudge rings as per requirements of schedule ofquantities.ii.Linear Supply air/ Return Air Grilles:This shall be extruded aluminium construction with fixed horizontal bars at 15dig inclination and flange on both side. The thickness of fixed bar louvers shall beat least 5.5mm & angle shall be 20mm/30mm inside The grilles shall be suitablefor concealed fixing volume control damper of extruded. Aluminium constructionwith black anodised finished shall be provided in SA duct collars
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96.0 SPLITTERS AND DAMPERS:All dampers shall be opposed blade type dampers of robust construction and tight fitting.They shall be made of G.S. sheet minimum 16 g thick and shall have brass bushes. Thedesign, method of handling, and control shall be suitable for the location and servicerequired.Dampers shall be provided with suitable links, levers and quadrants as required for theirproper operation control or setting devices shall be made robust, easily operatable andaccessible through suitable access doors in the ducts. Every damper shall have anindicating device clearly showing the damper position at all times Handles will beprovided with extended arms to account for insulation thickness.Dampers shall be placed in ducts and at every branch supply or return air ductconnection, whether or not indicated on the drawings, for the proper volume control andbalancing of the system.7.1 FIRE DAMPER:All Supply/Return air duct or path at AHU room wall or slab crossing shall be providedwith fusible link type fire damper The fire rating shall be of 90 minutes fire damperblades and outer frame shall be formed of 1.6 mm galvanised sheet steel. The damperblade shall be pivoted spindles in self lubricated bronze bushes, stop seals shall beprovided on top and bottom of the damper housing made of 16g galvanised sheet steel.Side seal shall be provided to preventing fire leakages7.2 FLEXIBLE DUCT CONNECTION :The Flexible Connection should be made of TF quality fire retardant double canvas orimported fabric of fibreglass weave having silicone rubber coating, as mentioned in theschedule of quantities. Flexible connections shall be air tight & water proof andwithstand high temperature application,' non flammable type and does not supportcombustion. There shall be extruded Angle aluminum frame at both ends for connection8.0 MOTOR1SED COMBINATION SMOKE & FIRE DAMPER :All supply/return air duct or path at AHU room wall or slab crossing shall be providedmotorised combined smoke and fire damper The fire rating shall be of 90 minutes firedamper blades and outer frame shall be formed of 1.6mm galvanised sheet steel. Thedamper blade shall be pivoted spindles in self lubricated bronze bushes, stop seals shallbe provided on top and bottom of the damper housing made of 16g galvanised sheetsteel. Side seal shall be provided to preventing fine leakages. Fire damper shall be keptopen during normal mode with the help of 230 V operated electric actuators spring toproviding maximum air passage without creating any noise or actuated either throughelectric actuator or through UL stamped electro-thermal link. The actuator shall beenergized with the help of a single from smoke detector installed in AHU room / RAduct/damper. The fire damper shall also close due to temp rise in SA Ducts through theelectric temp sensor factoy set at 165 deg F, micro switches with bakelite base will beprovided to stop fan motor & give open & close singnal at remote panel in case ofmotorised damper
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