Coated steel pipes with DN>50 mm yog raug rau flattening xeem. Qhov ntev ntawm cov yeeb nkab seem xeem yog (50 ± 10) mm.
Nyob rau hauv qhov kub ntawm (20 ± 5) degree, tso cov khoom xeem ntawm ob daim hlau tiaj tus, thiab maj mam muab tso rau ntawm lub tshuab ntsuas siab kom txog rau thaum qhov kev ncua deb ntawm ob daim hlau tiaj tus yog plaub feem tsib ntawm cov kab uas hla ntawm daim ntawv xeem, thiab siv cov yas thaum flattening. Hluav taws kub welds yog perpendicular rau cov kev taw qhia ntawm daim ntawv thov load. Tom qab qhov kev xeem, xyuas cov txheej txheej sab hauv, thiab cov txiaj ntsig kev xeem yuav tsum ua raws li qhov yuav tsum tau ua ntawm 5.8.
