The design feature for the standard model from FB-A-004 to FB-A-060 is vertical tubeless. With no tubes or coils to scale up, rust or burn out, this design reduces plant operating costs by eliminating downtime and expensive repairs. The boiler features top mounted, down fired power burner. For over 70 years, this standard model has a reputation for years of trouble-free operation. It is the No. 1 choice for the process industry.
The standard model from FB-A-080 to FB-A-150 is a vertical multi-port boiler. A series of heavy walled large diameter schedule 80 flue pipes are welded to the top and bottom heads in the pressure vessel. These pipes are surrounded by water. This wet back feature design speeds up boiler start up time and creates overall even heating throughout. The other design feature is the "ribboned" turbulators that extend the full length inside each flue pipe. The top mounted down-fired burner is an air pre-heat design, which enhances the boiler efficiency.