Heat Exchanger Carbon Steel., Heat Exchanger Low Alloy Steel., Heat Exchanger Ltcs. For Polypropylene Unit Ppu Project At Numaligarh Refinery, Assam Ss/C050-1P39a-Ee-Mr-6009/8 - Heat Exchanger Carbon Steel., Heat Exchanger Low Alloy Steel., Heat Exchanger Ltcs. For Polypropylene Unit Ppu Project At Numaligarh Refinery, Assam