procurement of most critical spares for instrument air compressors make kirloskar pneumatics co ltd model t btd pm installed in units 1 and 2 2x210 mw sgtps mppgcl birsinghpur--- 1 stud m12x1.75x35 2 lp valve cover o-ring ( suction ) 3 lp valve cover o-ring ( discharge ) 4 hp stud m10x1.5x25l 5 hp valve cover o-ring ( suction ) 6 hp valve cover o-ring ( discharge ) 7 hp inner cover assembly 8 hp outer cover assembly 9 hp cylinder assembly 10 lp cylinder assembly 11 lp cylinder outer cover 12 lp piston ring & rod assembly 13 lp piston ring 14 lp piston rod 15 cross head guide assembly 16 lp piston guide ring 17 gudgeon pin 18 hp piston ring & rod assembly 19 hp piston ring 20 hp piston guide ring 21 bearing upper half std 22 bearing lower half std 23 sight glass ( crank case ) 24 lp valve spring ( suction ) 25 lp valve spring discharge 26 lp unloader o-ring 27 lock washer for dome nut 28 split pin 3x22 29 hp valve cushion plate ( suction ) 30 hp valve spring ( suc. ) 31 hp valve spring ( discharge ) 32 connecting rod & cap assembly 33 crank shaft 34 one way clutch 35 flexible coupling assy. 36 oil wiper ring 37 air filter element assembly 38 oil filter element complete ( disch. ) 39 3-piece packing 40 6 -piece packing 41 oil distribution pipe 42 o-ring hp unloader 43 cross head 44 gear oil pump 45 cross head guide cover