The inspection formed a vital part of asset management of the jetty. The inspection and subsequent condition report highlighted defects and recommended repairs to the jetty that would help extend its design life.

The jetty site falls under the upper tier COMAH regulations and is used for the import and export of petrochemical bulk liquids. The jetty head was 106m long x 13.5m wide with mooring dolphins upriver and downriver. The deck is formed from in-situ reinforced concrete and bears on to steel tubular piles to form an exposed jetty construction. The fendering system was made up of timber piles on the shoreward, riverward and downriver sides of the jetty head.

In advance of the inspection works the following activities were completed to aid the effectiveness of the time spent on-site:

• A desktop site reconnaissance visits via satellite imagery.
• Preparation of base drawings of the marine assets (based on as-built drawings provided by the client).
• Review of existing data, as built and previous inspection records.

The timings of inspections were targeted to maximise the amount of time spent at periods of low and high tides where required. This provided the best opportunity for our inspection engineers to identify accelerated low water corrosion (ALWC).

The inspection was carried out in October 2022 where a condition report with recommended remedial repairs was issued to the client.

Challenges

The conditions on the River Humber were the biggest challenge. The Humber has a tidal range in excess of 6 m. Inspections were targeted during both low and high tides to ensure that as much the piles were inspected within shifts with our dive team utilised for any below water inspections.

The challenging weather conditions also proved difficult however our team members took safety precautions and came prepared with appropriate clothing to persevere through the conditions.

Client:
Associated Petroleum Terminals

Services:
Civil Engineering
Maritime Engineering