high frequency welded spiral finned chubu nthawi zambiri amagwiritsidwa ntchito pamakampani a petrochemical ndipo nthawi zambiri amayikidwa pazigawo zotenthetsera zotenthetsera, zotenthetsera zinyalala, zopangira chuma, zotenthetsera mpweya, ndi zotenthetsera kutentha zomwe zimaphatikizapo kusamutsa kutentha kuchokera kumadzi otentha kupita kumadzi ozizira kudzera pa khoma la chubu.