Maintenance of insulated booms on aerial devices and digger derricks is critical to preserving the integrity of the insulating qualities of the machines. While insulated equipment is required to be dielectrically tested each year, daily and periodic inspections of fiberglass components should be performed as directed by the manufacturer.
There are two common types of damage and wear that may affect the integrity of a fiberglass boom. The first, structural damage, is classified according to the type of damage – cuts, bruises or overloads. The second type is wear that occurs where there is contact with other components, such as at boom rests or at fiberglass-to-steel joints.
In both cases, the damage must be assessed to see if it is repairable. Each manufacturer provides information specific to the type and shape of its boom designs. For example, Terex Utilities provides two charts for the equipment it manufactures, which break the damage into minor damage and major damage. The severity of the damage will determine the course of action. Major damage must be reported to the manufacturer for analysis to determine if it can be repaired. Examples include overload damage, complete penetration of the wall or major damage within 24 inches of previously repaired major damage.