Kwintsimi yoshishino yanamhlanje, iibhobho zetsimbi zisetyenziselwa uluhlu olubanzi lwezicelo kunye neentlobo ezininzi, ezikhazimulayo. Phakathi kwabo, i-ASTM A106 / A53 / API 5L GR.B ibakala B lentsimbi, njengento ebalulekileyo yombhobho wensimbi, ithandwa ziinjineli kunye nabavelisi bexesha eligqwesileyo ...
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