Cyrco Inc. showcases FRP bushings for maximizing composite structural integrity

Cyrco Inc. (Greensboro, N.C., U.S.), a company that repairs, rebuilds and newly constructs field erected and metal cooling towers, is highlighting its fiber-reinforced polymer (FRP) bushings technology that maximizes the strength in composite tubed structures. The bushings encase the bolt’s “file-like” threads and prevent FRP tube hole wear.

FRP tubing is a semi-flexible material. When natural elements or induced vibrations are present (wind, motor vibration, foot traffic, etc.), these can jeopardize the integrity of the structural framing over time. For example, flexing causes movement and bolt friction to the drilled hole in the FRP tubing. With a back-and-forth movement, over time the bolt hole size increases, and thus more damage. This is especially true where contact is made with the bolt’s “file-like” threading against the softer, plastic composite tubing. 

Cyrco’s FRP bushings fully encase the bolt, therefore preventing any damage to the FRP tubing. They also mate in the middle to prevent cracked tubing from over-torqued bolts and assist the installer to the correct range of torque. According to the company, loosely installed bolts can cause damaging hole wear relatively quick and if the bolt is loose, the nut will un-thread, allowing the bolt to simply “pop” out. As a solution, Cyrco’s FRP bushings maximize the composite structure’s strength. The FRP bushings lock into place pre-assembled. They also enable workers to guide bolts through entrance and exit holes for reduced build times.

Moreover, through tensile strength testing performed by the Joint School of Nanoscience and Nanoengineering of North Carolina A&T State University, Cyrco’s FRP Bushings created more than a 6.0 shear service factor. This is more than twice the minimum 3.0 Cooling Tower Institute (CTI) standard, according to Cyrco.