<prompt> Translate the following text to EnglishKiwango hiki kinadhani kuwa asilimia 80 ya chuma cha muundo ni kwa ajili ya mifereji na msaada na asilimia 20 inahitajika kwa ajili ya chuma mbalimbali kama vile vifaa vya usafirishaji wa reagent, majengo, na mifumo ya usafirishaji wa vifaa.  <response>: This range assumes approximately 80 percent of the structural steel is for ductwork and supports and 20 percent is required for miscellaneous steel such as reagent conveying equipment, buildings, and solids handling systems. 