procurement of upper and lower pyrite gate spares for coal mill zgm123n for stg-1 boiler, sgtpp procurement of upper and lower pyrite gate spares for coal mill zgm123n for stg-1 boiler, sgtpp. , procurement of upper & lower pyrite gate spares forcoal mill zgm123n for stg-1 boiler, sgtpp . , valve body 300 mm,material- wcb for upper & lower pyritegate 300 mm,mill zgm123n ( with fasteners ) , valve gate 300 mm,moc-ss304 for upper & lower pyritegate 300 mm,mill zgm123n , edge stellited(stellite-6) , valve packing 300 mm, moc-ceramic fibre for upper & lower pyritegate 300 mm,mill zgm123n , valve gland follower 300 mm,moc-wcb for upper & lower pyritegate 300 mm,mill zgm123n ( with fasteners ) , valve yoke 300 mm,moc-steel grd astm a36 for upper & lower pyritegate 300 mm,mill zgm123n ( with fasteners ) => limited