5 adopt a variety of domestic and foreign standards for pipe flanges and flange sealing surface type to meet the needs of various projects and user requirements.
5.Thola izindinganiso ezahlukahlukene zasekhaya nezangaphandle zamapayipi we-flange namazinga wokuvala uphawu lwe-flange ukuhlangabezana nezidingo ezahlukahlukene zobunjiniyela nezidingo zomsebenzisi