High zaus welded kauv finned tubes feem ntau yog siv rau kev lag luam petrochemical thiab feem ntau ntsia rau ntawm qhov chaw convection ntawm cov cua sov uas raug rho tawm haujlwm, khib nyiab kub boilers, economizers, cua preheaters, thiab tshav kub exchangers nrog rau kev hloov ntawm tshav kub los ntawm ib tug kub kua rau ib tug txias dej los ntawm ib tug. cev phab.