corrigendum - tender for supply , installation , commissioning and warranty services of liquid nitrogen generation system . , main item , supply of liquid nitrogen generation system with 02 year warranty services , installation and commissioning charges , optional item , extended warranty of 03 years soon after the expiry of 2 years warranty . , an amc for three years after completion of stipulated two year warranty period must be quoted separately . , additional amc - vendor also must quote additional amc for 3 years soon after the expiry of 5 years . , ups a suitable ups with 30 mins back-up of power supply to run the plant , re-installation cost at permanent campus ( if required ) .