Complete Refurbishment of a 135m³ Sprinkler Tank
SGI Composites was appointed to refurbish a leaking 135m³ sprinkler tank located in historic Aberdeenshire, in the North East of Scotland. The tank featured a metal external frame and a timber internal structure, lined with a butyl membrane that had failed. Previous repair attempts to the liner had been unsuccessful, leaving the system compromised and in need of a long-term solution.
Following a detailed site survey to assess the extent of the issues, SGI Composites recommended a full tank relining using a high-performance fibreglass (FRP) system. This approach provided a robust, watertight, and durable alternative to the failing liner, restoring the tank’s reliability and ensuring long-term performance.
Preparation & Full Tank Refurbishment
The project began with the removal of the failed butyl liner, allowing a full inspection of the internal plywood structure. Due to its deteriorated condition, the timber lining was deemed unsuitable for reuse and was completely replaced to provide a sound base for the new system.
All internal surfaces were then thoroughly cleaned and prepared, with contaminants removed to ensure optimal adhesion. The tank floor was re-levelled, and new floor sheets were carefully installed and bonded to create a stable, uniform surface.
Once preparation was complete, a four-coat hand-applied fibreglass (FRP) lining system was installed, with a final gel coat applied to achieve a seamless, watertight finish. The lining was left to fully cure over a seven-day period before undergoing a detailed inspection to ensure complete coverage and performance prior to handover.
The image shows the tank following removal of the failed butyl liner, with the internal plywood structure replaced and prepared for the application of the FRP lining system.
Surface Preparation & Floor Installation
All contamination was removed and internal surfaces were carefully prepared to ensure optimal adhesion of the FRP lining system. The tank floor was re-levelled, with new floor sheets precisely applied and securely bonded to create a stable, uniform base for the subsequent lining works.
FRP Lining Application
The tank was fully relined using a four-coat, hand-applied fibreglass (FRP) system, creating a seamless and durable internal barrier. This multi-layered approach ensures excellent strength, flexibility, and long-term resistance to leaks, corrosion, and environmental stress.
Final Coating & Cure
A final gel coat was applied to provide a complete, seamless seal across all internal surfaces. The finished FRP lining was then left to fully cure over a seven-day period, ensuring maximum strength, durability, and long-term watertight performance before being returned to service.
Quality Inspection
The new wall and floor lining underwent a thorough inspection to ensure complete coverage and a fully sealed finish. This final quality check confirmed the integrity of the FRP system, guaranteeing a durable, watertight solution ready for long-term service.