I-191 ipakishwe kwi-220kg yenethi yobunzima bemigqomo yentsimbi kwaye inexesha lokugcinwa kweenyanga ezintandathu kwi-20°C. Amaqondo obushushu aphezulu ayakulenza libe lifutshane ixesha logcino.Gcina kwindawo epholileyo, engenamoya, ngaphandle kwelanga kwaye kude nemithombo yobushushu. Imveliso inokutsha kwaye kufuneka igcinwe kude namadangatye avulekileyo.