NATIONAL ALUMINIUM COMPANY LIMITED - Rites

2.4.5 Condenser: Air cooled type
2.4.6 Fan: Forward curved centrifugal fan
2.4.7 Filter: High efficiency filter
2.4.8 Cooling Coil
(a) Type: Direct Expansion
(b) Material: Copper
(c) Fins: Aluminum mechanically bonded.
2.4.9 Refrigerant: Piping Copper
2.4.10 Insulation for PAC parts: Expanded polyethylene of density at least 15 kg/cub.m.
2.5.0 Filters
2.5.1. Metallic Filters
(1) Max. air velocity: 2m/sec.
2.5.2 HDPE filters
(1) Efficiency: 90% down to 5 microns
(2) Max. velocity: 2.5 m/sec.
(3) Testing: As per BS 2831 / Sqv.
2.5.3 High Efficiency Filter
(1) Efficiency: 99.9% down to 5 microns.
(2) Pr. drop across: 10 mm W.C.
(3) Testing: As per BS 2831 / Sqv.
2.6.0 Insulation for A/C Ducting Resin Bonded Mineral wool as per IS:8183
2.6.1 Density: 24 kg/cub.m
2.6.2 Thermal conductivity: 0.49 mw/cm deg.C
18.0 DESIGN OF CONVEYOR GALLERIES AND JUNCTION HOUSES
18.1 Design Considerations
a) The general parameters for conveyor galleries shall conform to the provision of IS : 11592 11592-
1985 unless specified otherwise in Technical Specifications. The structures shall be designed
so as to meet functional requirem requirements ents and shall provide space for operation, maintenance
and removal of machinery and give the workers good and safe environment.
b) Gallery floors shall be of chequered plates supported on steel beams.
c) Steps shall be provided with (rise not exceeding 130 mmm
m along the walkways if the gallery
slope exceeds 12°. . In case the slope of gallery is between 66°
to 12°, , suitable ribs (without any
sharp edges) shall be provided on floor at 250 to 300 mm intervals.
d) Roof and side walls of conveyor galleries shall be covered with Aluminium industrial
troughed sheets. . with a provision of gap of 300 mm below roof and 150 mm from top of
floor level on the side wall for ventilation.
e) Adequate provision for natural light in inside side conveyor gallery shall be made through side walls
by providing translucent sheets (FRP sheets as per IS: 12866 12866-1989). 1989). Every sixth sheet on side
wall shall be FRP sheet and shall be staggered on opposite wall.
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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