NATIONAL ALUMINIUM COMPANY LIMITED - Rites

Carriage Frame
Travel Carriage drive
: Single fabrication assembly.
Motor : Hydraulic
Travel brake : Integral part of hydraulic motor
Bearings for sheaves : Anti friction bearings.
10.0 APRON FEEDER
10.1 GENERAL
Apron feeders complete with all accessories shall be furnished for wagon tippler hoppers as
specified.
10.2 CODES & STANDARDS
The design, manufacture, inspection and testing of apron feeders shall comply with all the
currently applicable statutes, regulations and safety codes in the locality where the
equipment is to be installed. The apron feeders shall conform to the latest edition of the
standards and codes. Other internationally acceptable standards/codes, which ensure equal
or higher performance e than those specified, shall also be accepted. Nothing in this
specification shall be constructed to relieve the contractor of the required statutory
responsibility. In case of any conflict in the standard and this specification, the decision of
the Engineer eer shall be final and binding.
10.3 DESIGN REQUIRMENTS
Apron feeders shall be of robust construction & designed for handling ROM coal as specified
and without any choking particularly during rainy season when coal is sticking. A drible
conveyor shall be provided for proper clean up. The pan and chain shall be of proven design
and shall be with adequate factor of safety.
10.4 CONSTRUCTION REQUIREMENT
The frame shall be manufactured from rolled steel section welded and bolted together to
form a rigid structure. cture. The roller shall be life time lubricated and shall be manufactured from
alloy steel.
The chain Link shall be forged steel. Pins and rollers shall be of hardened steel. The chain link
shall be bolted to the pans. Apron/pan shall be of suitable thickn thickness which shall be
constructed out of fabricated MS with wear resistant liner plate or special alloy steel without
any liner plate for the duty requirement. The pan would be fitted directly to the chain
attachment. The head and tail end shall be of sturdy steel construction suitably stiffened.
The sprocket shall be made of cast alloy steel with case hardened teeth or forged steel. The
traction wheel shall be made of cast steel with case hardened surface. Tensioning
arrangement with sufficient travel shall bbe
e provided for the tensioning of the chain chain.
Complete dribble belt system consisting of head pulley, tail pulley, drive, motor, stringers,
deck plates etc. shall be provided.
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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