Tank Roof Repair
68m Diameter Storage Tank roof with 65 locations of severe external & pitting corrosion leading to numerous through-wall defects.
The aim of PCR composite repair is to restore the integrity to the tank roof upper skin plates using a patch repair process. The defect sizes were varying through-wall penetrations of 10 - 250mm diameter extending up to 3000mm in length in varying locations.
Application during summer months with high ambient air temperature conditions.
Bespoke adhesive required to cope with thermal movement of the tank.
Due to spark risks, the surface preparation is limited to ST-3.
Pre-Cured Patch plates were manufactured using the PCR-GX (Glass Fibre Reinforced Plastic) composite repair system and machine cut to size. Plate thickness: 5mm.
PCT utilised non-spark power tools to obtain an ST-3 surface preparation on the tank roof over the corroded areas.
PCT epoxy adhesive layer applied to provide flexible bonding between steel and FRP plates in order to compensate with tank roof thermal expansion and movement.
The PCR-GX patch plates were applied to the 65 locations and compression applied until the epoxy adhesive fully cured.