Oku kufanelekile ke kube yinxalenye yenkqubo yokuthutha ulwelo (ioyile, igesi, isitya, iikhemikhali, ...) ngendlela ekhuselekileyo nefanelekileyo.
Yonke i-ASTM A234 i-Elbow & Elbow A234 WPC yenziwa kwiplate, icinezelwe iihafu ezimbini ezinamagqabi amabini edlelo. Sinikezela nge-100% ye-radiography kuyo yonke i-welds njengomgangatho.