high frequency welded spiral finned tubes hangata e sebelisoa indastering ea petrochemical mme hangata e kenngoa likarolong tsa convection ea heaters tse chesitsoeng, liboiler tsa mocheso oa litšila, li-economizers, li-preheaters tsa moea, le li-exchanger tsa mocheso tse kenyelletsang ho fetisoa ha mocheso ho tloha mokelikeli o chesang ho ea ho mokelikeli o batang ka ho. lerako la tube.