NATIONAL ALUMINIUM COMPANY LIMITED - Rites

17.3 SCOPE
gain into the room, adequate no. of air changes etc. to maintain a uniform temperature and
relative humidity within the air conditioned areas.
17.3.1 Mechanical Ventilation System
The ventilation system generally consisting of adequate number of supply and exhaust air
fans, air filters, ducting along with 3 phase AC motor drives, electricals, supporting
structures, approach/maintenance platforms, civil and structural works and necessary
accessories shall be furnished for ventilating the WT hopper, underground portion of
transfer points, underground conveyor tunnel tunnels s and pent houses. Exhaust fans shall be
provided for Toilets & Battery rooms.
17.3.2 Pressurised Mechanical Ventilation System
The ventilation system generally consisting of adequate number of supply and exhaust fans,
metallic pre filters, HDPE fine fi filters, lters, ducting along with 3 phase AC motor drives, electricals,
supporting structures, approach / maintenance platforms, necessary shed, civil & structural
works and necessary accessories shall be furnished for all MCC/switchgear rooms.
17.3.3 Air Conditioning ioning System
17.3.4 2x100% capacity air conditioning units shall be provided for Wagon Tippler Control Room.
17.3.5 Supply and return air distribution ducting complete with insulation, of resin bonded mineral
wool equivalent of density at least 24 Kg/m Kg/m³ ³ and thermal conductivity of max. 0.49
mw/cm°C conforming to IS:8183 including supporting structures, approach/ maintenance
platforms, civil and structural works and necessary accessories shall be provided.
17.3.6 Air cooled PAC shall be provided provided.
17.3.7 Area around centrifugal fans, filters, motor foundation shall be paved to have a clear
surrounding.
17.4 Codes & Standards
The design, manufacture, inspection and testing of Ventilation & A/C System shall comply
with all the currently applicable statutes, regulations and safety codes in the locality where
the equipment is to be installed. The Ventilation & A/C System shall conform to the latest
edition of the following standards and codes. Other internationally acceptable
standards/codes, which eensure
nsure equal or higher performance than those specified, shall also
be accepted. Nothing in this specification shall be construed to relieve the contractor of the
required statutory responsibility. In case of any conflict in the standard and this
specification, ion, the decision of the Owner Owner/RITES shall be final and binding.
• IS:3588 : Specification for electrical axial flow fans.
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
Page 47 of 64