Shop Factory Fabrication of Structural Steel including painting work as per BOQ approved drawings and Transportation of finished fabricated materi

A23 Supply and Fabrication of high strength structural steel (E350 ) in built up section conforming to IS:2062, in

columns, beams, struts, monorails, stays, safety chains, ladders, gantry girders, roof trusses, portals,

laced purlins, space frames, hangers, wall beams, sheeting runners, brackets, stiffeners, stub columns,

bracings, cleats, base plates, splice plates,gussets, end plates, steel frame grid over false ceiling,

walkway platforms, ladders, stairs,stringers, treads, landings, decking and seal plates, galleries etc

including blast cleaning, providing & applying primer,providing and applying intermediate, final and final finish

coat of paint (blast cleaning,primer and paint shall be paid separately as per item no C23, D23 &

E23),connection design & preparation of fabrication drgs, straightening, cutting, bending, rolling, grinding,

machining, drilling, welding, electrodes and other consumables, alignment, erection bolts & nuts (weight of

erection bolts, nuts and welds not payable), assembly, edge preparation, preheating (However, permanent

bolts are payable separately), assembly, edge preparation, preheating (min preheat and interpass temperature of

120-140o C for welding over 20 mm thickness & use of low hydrogen/ radiogenic electrodes), post

heating, testing of welders, inspection of welds, visual inspection, non destructive and special testing,

rectification and correction of defective welding works, production test plate, inspection and testing,

erection scheme, protection against damage in transit, stability of structures, installation of temporary

structures, setting column bases, surface preparation by means of manual or mechanical power tools as per

IS:1477 part 1, touch-up painting, rectification, dismantling and removal of all temporary structures

(weight of temporary structures not payable), etc all complete. Including appointment of a seperate

agency, approved by NBCC/BHEL, for review and approval of fabrication drgs, in consultation with NBCC/BHEL.

a For shop fabricated of structural steel and fabricated materials transported at NTPC Project, Tandwa Jharkhand

(Supply of raw structural steel in contractor's scope) MT 44 44.0

B23 Supply and Fabrication of structural steel of grade E 250 in rolled/ built up section conforming to IS:2062, mild

steel rounds in columns, beams, struts, monorails, stays, safety chains, ladders, MS gratings, gantry girders,

roof trusses, portals, laced purlins, space frames, hangers, wall beams, sheeting runners, brackets, stiffeners,

stub columns, bracings, cleats, base plates, splice plates,gussets, end plates, steel frame grid over false

ceiling, walkway platforms, ladders, stairs,stringers, treads, landings, decking and seal plates, galleries

etc including blast cleaning, providing & applying primer,providing and applying intermediate, final and final

finish coat of paint (blast cleaning,primer and paint shall be paid separately as per item no C23, D23 & E23),

connection design & preparation of fabrication drgs, straightening, cutting, bending, rolling, grinding, machining,

drilling, welding, electrodes and other consumables, alignment, erection bolts & nuts (weight of erection bolts

and nuts not payable), assembly, edge preparation, preheating / post heating if required, testing of

welders, inspection of welds, visual inspection, non destructive and special testing, rectification and

correction of defective welding works, production test plate, inspection and testing, erection scheme,

protection against damage in transit, stability of structures, installation of temporary structures, setting

column bases, surface preparation by means of manual or mechanical power tools as per IS:1477 part 1,

touch-up painting, rectification, dismantling and removal of all temporary structures (weight of temporary

structures not payable), etc all complete. Including appointment of a seperate agency, approved by NBCC/BHEL,

for review and approval of fabrication drgs, in consultation with NBCC/BHEL. Digitally signed by PRIYA

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Date: 2023.05.30 11:35:03 IST

Vol-III

ITEM SL Quantity (Unit

Description of Item Unit Total Quantity Rate (Rs.) REMARKS

For shop fabricated structural steel(Supply of structural steel in contractor's scope)

C23 Extra over SL NO. A23 & B23 for blast cleaning of steel structures to near white metal surface conforming to Sa

2 ½ finish of ISO 8501-1 with surface profile 40-60 Micron and providing and applying two component

moisture curing zinc (ethyl) silicate primer coat (having minimum 80% of metallic Zinc content in dry

film, solid by volume minimum 60% ±2%) of minimum 70 micron DFT including the cost of all labour,

material, equipments, protection of surface and cleaning, scoffolding, touch-up painting etc., complete

as per drawings, specifications and instructions of the Engineer. Zinc dust composition and properties shall be MT 176 176.0

Type-II as perASTM D520-00. Primer coat shall be applied in Shop immediately after blast cleaning by airless

spray technique.

D23 Extra over SL NO. A23 & B23 for providing and applying (by airless spray technique) intermediate coat

of two component polyamide cured epoxy with MIO Content (containing lamellar MIO minimum

30% on pigment, solid by volume minimum 80% ±2%) of minimum 100 micron DFT after an interval of

minimum 24 hours (from the application of primer coat) and of approved make including the cost of all

labour, material, equipments, protection and cleaning, scoffolding, touch-up painting etc. all complete as per MT 176 176.0

drawing and specifications.

E23 Extra over SL NO. A23 & B23 for providing and applying Finish coat of two-pack aliphatic Isocyanate cured

acrylic finish paint (solid by volume minimum 55% ±2%) with Gloss retention (SSPC Paint Spec No 36,

ASTM D 4587, D 2244, D 523) of Level 2 (after minimum 1000 hours exposure, Gloss loss less than 30 and

colour change less than 2.0 ∆E) and minimum 70 micron DFT over steel sections already having intermediate

coats, including the cost of all labour, material, equipments, protection and cleaning, scoffolding etc. all complete

as per drawing and specifications. This coat shall be applied after an interval of minimum 24 hours (from the

application of sealer coat) and within six (6) months (from the completion of Intermediate coat). Colour and shade

of the coat shall be as approved by the NBCC/BHEL.

Digitally signed by PRIYA

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Date: 2023.05.30 11:35:03 IST