Bakin karfe rufi ne daya daga cikin sassa na kwantena, bisa ga bambancin geometry, za a iya raba shi a cikin nau'ikan spherical, oval, farantin, ball-type crown, cone shell da rufi, da dai sauransu, wanda spherical, oval, farantin, ball-type rufi da aka sani a matsayin convex-type rufi. Ana amfani da kayan aikin kwantena daban-daban kamar tanks, masu musayar zafi, hasumiyoyi, reactors, boilers da na'urorin rabuwa da sauransu.
Cikakken ka'idodin bakin karfe rufi: matsin lamba kwantena rufi GB / T25198-2010 bututun ka'idodin GB / T12459-2005 GB / T13401-2005 wutar lantarki ka'idodin DL / T695-1999 D-GD87-0607 petrochemical ka'idodin SH3408-1996 SH3409-1996