Emkhakheni wezimboni zanamuhla, amapayipi ensimbi asetshenziswa ezinhlobonhlobo zezicelo nasezinhlotsheni eziningi, okuyinto ekhazimulayo. Phakathi kwazo, i-ASTM A106/A53/API 5L GR.B yensimbi ebangeni B, njengento ebalulekile yamapayipi ensimbi, ithandwa onjiniyela nabakhiqizi ngep...
Funda kabanzi