1. Kwa mapaipi okhala ndi nsonga zapamwamba zometa, chifukwa cha kusagwirizana kwa gasi ndi ogwiritsa ntchito, kusinthasintha kwapaipi pafupipafupi, ndi kupsinjika kwapaipi komwe kumakhudzidwa ndi mapaipi achitsulo, zolakwika zomwe zilipo m'mipope zidzakula pansi pa kupsyinjika kosiyana. Spiral welded zitsulo mapaipi okhala ndi welds ambiri ndi ...
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