procurement of spares of ms atlas copco make compressors model zr 355 serial no. pna 601110 pna 601111 and pna 601112 installed at turbine of 1x500 mw sgtps birsinghpur... procurement of spares of ms atlas copco make compressors model zr 355 serial no. pna 601110 pna 601111 and pna 601112 installed at turbine of 1x500 mw sgtps birsinghpur. , roto z oil (209 ltrs. drum) , diaphragm , membrane , membrane , oil pump kit , 4+ check valve kit , b maintenance kit , c maintenance kit , cooler cleaning kit , rubber coupling set , check valve nrv , drain valve , drain valve , inlet valve kit , gear box overhauling kit md dryer , maintenance kit 8000 h md dryer