procurement of spares for air compressors of model no . zr 250 and air drier of model no . md 600 of make atlas copco for unit no . 10 , 11 of ph-iv , spares for air compressors of model no . zr 250 and air drier of model no . md 600 , zr/zt160vsd air/oil filter kit part no . 2906073000 , zr160-315vsd 8000h maint kit part no . 2906080000 , zr160-315vsd 16000h maint kit part no . 2906080200 , md600/800 ( w ) vsd 8000h kit part no . 2906083300 , md600-1000 regener cooler kit part no . 2906032600 , md600-2500 gearbox overhl kit part no . 2906079900 , seal ring md600-1000 part no . 1617538006 , bushing part no . 1623994100 , seal washer part no . 661100027 , coupling set spares for air compressors part no . 1619646706 , roto-z barrel 209 l part no . 2908850000 , zr 250 cooler kit part no . 2906079700 , zr 160-275 lp element exchange kit part no . 2906038600 , zr 250-315 vsd hp element exchange kit part no . 2906079600 , gear pinion part no . 1616622102 , lp element o . f . s . m21 part no . 1616590481 , zr 160-275 gearcasing seal kit part no . 2906038800 , zr/zt110-275 oil pump kit part no . 2906037300 , md600-1000 air valve kit part no . 2906032500 , tubestack copper free 14 fins part no . 1630990131 , zt110-275 disch . silencer kit