I-tube engenamthungo yenziwe ngeebhloko zetsimbi ezomeleleyo ngaphandle kwe-welds.I-Welds inokumela iindawo ezibuthathaka (ezinokutshatyalaliswa, ukubola kunye nomonakalo jikelele).

Xa kuthelekiswa neetyhubhu ezidityanisiweyo, iibhubhu ezingenamthungo zinokuqikelelwa ngakumbi kwaye zichaneke ngakumbi malunga nokujikeleza kunye ne-ovality.

Eyona nto ingalunganga yemibhobho engenamthungo kukuba ixabiso ngetoni nganye liphezulu kunemibhobho ye-ERW yobukhulu kunye nebakala.

Ixesha elikhokelayo linokuba lide kuba kukho abavelisi abambalwa beepayipi ezingenamthungo kunemibhobho edibeneyo (xa kuthelekiswa nemibhobho engenamthungo, umqobo wokungena kwimibhobho edibeneyo iphantsi).

Ubunzima bodonga lombhobho ongenamthungo bunokungahambelani nobude bayo bonke, ngokwenene ukunyamezela okupheleleyo +/- 12.5%.