Refining NZ‘s jetty loading structures are key to the entire plant’s operation, with zero redundancy for their function. Built in a corrosive marine and industrial environment, the structures – which had durability issues and some structural deficiencies – were in a deteriorated condition and need of repairs and maintenance.
The brief was for a solution that provided 25 years of service before first maintenance. Any solution would need to take account of the limited accessibility and allow the structures to remain available for service at all times.
Initially a condition assessment and seismic fitness for service assessment were completed. This process was aligned with the IPENZ PN19 Guideline to assess level of compliance and risk for ongoing use. Additional wind loading due to temporary works (shrink wrapping entire structures) required for maintenance activities were also considered as part of this process.
Detailed specifications for structural repairs and modifications were created, along with a quality control and tracking system for repairs. Using GRIT’s expert coatings and durability knowledge and working closely with coatings manufacturers and contractors, the most suitable products and systems were identified. Specifications were reviewed and approved by the client, contractors and suppliers to ensure buy-in from all stakeholders.
GRIT continues to work alongside contractors to ensure the specifications are practical and develop improvements where possible, modifying the specifications to improve efficiency.
With the majority of this rehabilitation project now completed, the client can be confident that the structures remain safe for ongoing operation. Once fully maintained, the structures will be compliant in accordance with building code and IPENZ PN19 requirements. Along with repair and maintenance guidance and a maintenance program to maximise the performance of protective coatings, the outcome for the client is an asset that will be durable and reliable for the next 25 years or more.