bids are invited for procurement of calibration gases for ntpc vindhyachal m9438378673_std o2 cal span gas 0.4 percent cylinder , m1070206012_calibration gas 8 percent oxygen balance n2 , m1060250097_hydrogen, l, is1090, 99.999 percent - ultra pure , m1060832255_calibration gas- h2 in n2-95 percent h2 and bal-n2 , m1080831001_co2 calibraton gas cylinder-10 ltr, full , m1060832200_calibration gas - h2 in n2-90 percent hydrogen , m1080851001_zero calbrton gas sox or nox or co2, 10ltr-full , m9438456155_zero gas 100percent n2 in 10 ltrs cylinder , m9438376044_cal test gas, 2percent oxygen balance nitrogen , m9438456026_calibration test gas so2 , m1080821001_so2 calibration gas- cylinder10 ltr- full , m1060901012_gas mix-so21200 plus no1200 plus co2 32percent plus n2-10 , spindle or gland nut , cylinder valve -brass , oil or paint contamination , preconditioning charges , hydraulic testing charges for 10 ltr , cylinder valve -ss bent , valve safety guard procurement of calibration gases for ntpc total quantity : 650