Okwangoku, i-Hunan Great Steel Pipe Co., Ltd iphethe iiseti ezi-3 zomgca wokuvelisa umbhobho wentsimbi ongenamthungo kunye neeseti ezi-2 zomgca wokuvelisa umbhobho wentsimbi ongenamthungo oshushu kunye nomthamo wonyaka wemveliso yeetoni ezingama-200,000, uluhlu lobungakanani ukusuka kwi-73mm ukuya. 630mm. Ikhabhu yayo yeelebhu zomzimba kunye neekhemikhali ziqhuba iimvavanyo ezahlukeneyo zomzimba kunye neekhemikhali kunye neemvavanyo zemibhobho yentsimbi, kwaye zixhotyiswe ngee-eddy zangoku zokujonga isiphene, ukubonwa kwempazamo yokuvuza kunye ne-ultrasonic crack detectors njl. Kwimibhobho yentsimbi engenamthungo ephezulu, ephakathi kunye nephantsi kunye nemibhobho yepetroleum casing. ngoluhlu olupheleleyo lwemilinganiselo yokuhlola, ekwaziyo ukuhlangabezana nemigangatho eyahlukeneyo yovavanyo kunye neemfuno zokuhlola kwimibhobho yentsimbi.