OT 153

Amount

“Reconditioning of Hydraulic loading cylinder assembly with replacing of new cylinder, Piston rod and seals for ZGM133G-II model vertical roller coal mills” work involves, i) Dismantling of all parts like Top end cap, Bottom end cap, Cylinder barrel, Piston, Piston rod, Piston seal set, Piston rod seal set etc… one by one. ii)Inspection of cylinder barrel bore, piston rod, seal kit and special bearing. iii) Renewal of new cylinder barrel and finishing to require bore ze. iv)Renewal of piston rod and applying hard chrome plating over the external surface and finishing to required size by cylindrical grinding / Polishing. v) Replacement of new seals set for piston & piston rod without changing the size & qty of the existing seals set. (Required qty. of new seals are under contractors scope). vi) Assembling of all internal parts one by one. vii)Conducting hydraulic pressure test upto 20 Mpa and produce hydraulic test certificate. viii) To & Fro Transporting charges. ix)The Reconditioned Hydraulic cylinder & seals are to be guaranteed for 12 months from the date of erection. If any intermediate failure occurs it has to be rectified at free of cost. x)Old cylinder barrels & Piston rods are to be returned along with the econditioned cylinders. xi) All the works related to the reconditioning of hydraulic loading cylinder assembly to be done, to the entire satisfaction of the site Engineer in charge. Technical specification of Hydraulic cylinder : Cylinder diameter : 250 mm Piston rod diameter : 160 mm Cylinder stroke : 400 mm Pressure : 20 Mpa Bottom mounting : Clevis end Top mounting : Threaded End

Charges for thread cleaning & re-tapping the 24 Nos. of M30 hole & 12 Nos. of M20 hole of top & bottom flange of Hydraulic cylinder, Painting of reconditioned hydraulic loading cylinder by one coat of red oxide primer & two coats of epoxy yellow paint one over the other after through cleaning of cylinder surface by sand blasting, Renewal of expansion bellow for piston rod & renewal of spherical bearing at bottom clevis end etc… (Required quantities of Rust convertor, Epoxy red oxide primer, Epoxy golden yellow paint, Epoxy thinner etc are under contractors scope) .

Vijay Shri Engineering (BID ID -1108977)