NATIONAL ALUMINIUM COMPANY LIMITED - Rites

18.6.2.11 All tapered washer shall be as per IS: 55372
372 for channels, and IS: 5374 for Joists. Spring
washers shall conform to IS: 3063.
18.6.2.12 All HSFG bolts shall conform to IS: 3757. Assembly of joints using HSFG bolts shall
conform to IS: 4000. Nuts and washers for HSFG bolts shall be as per IS: 66 6623 & IS:6649
respectively.
18.6.2.13 Covered electrodes for arc welding shall conform to IS:814 IS:814–2004. 2004. Electrode to be used
for submerged arc welding shall conform specification IS: 7280 7280-1974.
Alternatively
Covered electrodes for arc welding shall confirm to AWS Specifications and shall be as
follows.
- E 6013 for all fillet welds of IS 2062 steel dr E250 , quality A & B
- E 7018 for all fillet welds of SAIL SAIL-MA 350 HYA steel
- E 7018 for all but welds including site welds irrespective of the quality of ste steel.Viz. IS
2062 gr E250 , quality A , B or SAILMA SAILMA-350 HYA steel.
18.6.2.14 Certified mill test reports of materials used in the work shall be made available for
inspection by the Owner / Consultant upon request.
18.6.3 Fabrication
18.6.3.1 Fabrication of all structural steelwork shall be in accordance with IS:800 or their equivalent
foreign national standard of the country of origin of supply unless otherwise specified, and
in conformity with various clauses of the Technical Specification.
18.6.3.2 Wherever herever practicable and wherever perfect matching of parts is required at site, members
shall be shop assembled before despatch to minimise site work. Parts not completely
assembled in the shop shall be secured, to the extent possible, to prevent damage du during
despatch.
18.6.3.3 ERECTION OF STEEL STRUCTURES
18.6.3.3.1 Scope
The scope of work under erection includes in addition to provision of erection and transport
equipments, tools and tackles, consumables, materials, labour and supervision, the
following:
a) Storing and stacking at site of erection of all fabricated structural components/
units/assemblies till the time of erection.
b) Transportation of structures at site.
c) Receiving at site of structures including site handling /movement, unloading, storing and
stacking at site of erection of technological structures such as bunkers and the related
structures
d) All minor rectification / modification such as :
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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