GAIL (India) Limited

49For glazing of very large areas, rust proof steel beading with mitres corners shall be provided with screws@ 10 cm. from each corner and @ 20 cm, apart from each other. Putty shall be provided to the face of thebead in contact with glass, in addition to back putty.Side hung shutters shall be connected to the frame by means of friction hinges. The handle for side hungshutters shall be of pressed brass mounted on a steel handle plate welded to the opening shutter frame andshall not be removable easily after glazing. The handle shall have a two point nose which shall engagewith a brass striking plate on the fixed frame in a slightly open as well as in a fixed position.Top hung shutters shall be provided with steel butt hinges welded to the fixed frame after cutting a slot init. Top hung casements shall be provided with peg stay of 3 holes of pressed brass, 300 mm long whichwhen closed shall be held tightly by the locking bracket fitted to the fixed frame or to the window.Before fixing the frames, the size of the opening shall first be checked and cleaned of all obstructions. Thepositions of the unit in the reveal shall be taken off the drawings and shall be marked on the reveal at thejambs using a plumb line. In case of fixing with masonry, holes for fixing the lugs / hold fasts shall be cutat required locations. In case of concrete or stone, the frames shall be fixed by means of dash fastners. Incase of masonry, the lugs shall grouted in the holed with cement concrete, M-15 Grade when fixing tosteel work, mastic shall be applied to the sill of the opening and the unit shall be placed on it with the jamsand head buttered with mastic and the unit shall be fixed with special fixing clips or with nuts and bolts.The windows / ventilators shall be checked to ensure smooth operation, perfect level and plumb.All the steel surfaces shall be thoroughly cleaned free of rust, mill scale, dirt, oil etc., by sand and shortblasting and then finished with painting by priming with red oxide zinc chromate primer confirming to IS2074 and painting conforming to IS 1477 (Part II) or by hot dipped galvanizing conforming to IS 1477Part (I). Putty shall also be provided with painting in a manner so as to seal the putty glass junction.Surface not meant for painting shall be cleaned of any strains of paint.7.5 Aluminium Glazed Doors / Windows / Ventilators7.5.1 GeneralAluminium glazed doors / windows / ventilators shall be of specified sectional size, dimension and profileas per drawings.7.5.2 MaterialsAll Aluminium sections shall be extruded sections of INDAL aluminium alloy as per IS:733 and IS:1285.Aluminium sections shall be anodized as per IS: 7088 to min, 25 microns.Glass used for glazing shall be of following type in accordance with item description.i. 5.5 mm thick wired glass conforming to IS 5437.ii. 6.3 mm thick laminated safety glass conforming to IS 2553.iii. 5.5 mm thick transparent sheet glass conforming to IS: 2853 (Wt. 7.2 kg/sq.m).7.5.3 WorkmanshipFrames shall be square and flat, the corner of the frame being fabricated to true right angles. Details ofconstruction of frames, shutters etc., shall be as per drawings.Side hung window shutters shall either be fixed to the frame with pivots, or aluminium alloy hinges. Forfixing the hinges, slots shall be cut in the fixed frames and the hinges inserted inside may be riveted to theframe. The hinges shall normally be of the projecting type conforming to IS designation A-5-M of IS –617, IS 733. In which case peg stay of 300 mm long complete with locking bracket and conforming to IScodes same as for hinges shall be provided. Friction hinges may also be provided in which case peg staysare not required.The handles for side hung shutters shall be of cast aluminium conforming to IS designation A-5-M of IS617 and shall be mounted on a handle plate riveted to the opening frames. The handle shall have anodized