S e c t i o n 1 3 - P a g e 3 May 2013 Steel Rib Supports *Other variations available on r equest. DSI Under gr ound Systems Inc. can bend I,  WF , H sections ranging fr om 4" to 27" in depth (DSI  Under gr ound  Systems Inc. has formed W14x287 lb ft with 2" flanges). Curvatur es range fr om a minimum radius of 10 times the beam depth for 4" and 6" sections to 14 times the depth of section for lar ger beams. While DSI  Under gr ound Systems Inc. has worked with 30' sections, it is r ecommended the sections not exceed 22'. DSI Under gr ound Systems Inc. also r ecommends against the use of lighter -weight sections when the radius of curvatur e is less than 25 times the depth of section. DSI Under gr ound Systems Inc. also fabricates straight beams, for epoling sheets, steel lagging, tie r ods, foot plates and pipe spacers. www .dsiundergr ound.com