FRP structures in industrial environments are commonly evaluated as low‑maintenance rather than zero‑maintenance systems. Routine inspection and occasional cleaning may help maintain the long‑term surface condition of FRP components, while the absence of a coating system removes the recoating cycles associated with coated steel structures. This guide identifies the maintenance considerations relevant to FRP structural systems in corrosive operating environments.
Inspection Considerations
FRP structures may be included in a facility's general structural inspection program. Inspection intervals are commonly determined by the facility operating conditions and any relevant regulatory requirements, with additional inspections potentially warranted after significant events such as equipment impact or fire exposure. Inspection activities may include:
- Mechanical damage assessment: Impact events can cause localized surface changes in FRP elements. Visual indications may include surface discoloration or crack lines. The significance of any observed surface change should be evaluated according to the component function and the extent of the affected area. Surface-level scratches that do not extend into the structural laminate are commonly considered cosmetic.
- Fastener condition review: A sample of grating clips, structural connection bolts, and handrail base plates may be checked for signs of loosening or movement. The specific inspection method and acceptance criteria can be determined according to the connection design and the manufacturer installation specifications.
- Surface condition monitoring: FRP surfaces exposed to outdoor conditions may exhibit gradual changes in surface appearance over extended periods. Such changes are commonly limited to the surface veil and may not indicate a change in structural properties. If the surface veil shows significant wear, surface protection measures can be evaluated according to the specific exposure conditions.
Cleaning Considerations
The most common maintenance action on an FRP structure is cleaning to remove accumulated deposits. Pressure washing with water is commonly used, with the specific pressure and nozzle distance selected according to the FRP component type and surface condition. Excessively high pressure or close nozzle proximity may affect the resin-rich surface layer. For oil or grease contamination, mild detergents can be applied before pressure washing. The compatibility of any cleaning agent with the specific FRP resin system should be verified before application.
Coating System Considerations
FRP structures do not require a protective coating system. The color is integral to the resin and is typically added during manufacturing. The absence of a recoating cycle removes the associated activities — including surface preparation, coating application, and associated access requirements — from the maintenance schedule. This may be a relevant factor when evaluating long‑term maintenance resource requirements for structural systems in corrosive industrial environments.
For maintenance products and chemical compatibility information, refer to the individual product pages under FRP Access Components or consult the relevant resin chemical resistance data.