procurement of compressor spares for ngc installed at nhtccr at iocl barauni refinery. procurement of compressor spares for ngc installed at nhtccr at iocl barauni refinery. , list of item ( s ) / work ( s ) as per tender documents , ring piston 30 p / n:dr2win43021rp31 , ring rider 30 p / n:dr2win43020pp33 , ring piston 23p / n:dr2win43021rp32 , ring rider 23 p / n:dr2win43020pp34 , ring packing purge type, dr2r87096e819t72 , ring packing-rt, p / n:dr2r87096x819t72, , ring oil scrpr-4.5 in p / n:dr2r79480t9bim , spring & insert p / n:dr2pp1388nbim , gasket p / n:dr2drgagc0624x0708 , ring packing, p / n:dr25a11h72im, , vlv / plngr isc8.50 mag p / n dr2mlr88842g38 , vlv / plngr isc10.50mag p / n:dr2mlr88842g39 , bullet, p / n:dr2r83865aim, , o ring p / n:dr220a11em373 , gasket soft steel p / n:dr230a11f1100x16im , gasket soft steel p / n:dr230a11f0858x13im , o ring p / n:dr220a11em451