About the asset

The Foinaven is the first FPSO to be in the waters West of Shetland. Our client was Teekay with operating partners BP.

Katoni’s role in supporting Teekay

We supported Teekay on this asset in 2018 and this particular commission was to carry out a permanent repair to a badly corroded 406 Universal Beam which provides a support to the deluge skid.

Collaboration in action

Understanding the Teekay’s needs – We were contacted by the client to advise they had been blasting a 406 UB and parts of its web started to flake off creating penetrations as shown in the photograph. They stopped the blasting and reported the anomaly. Given the congested environment around the beam, a cold work solution would be a more viable.

Delivery – To prevent having to wait for a shutdown, a cold work solution was designed as the permanent repair. The flanges were in suitable condition to remain, however, the web had to be contained, hence installing the fabricated channel sections which will protect the web from further corrosion. The engineering design was delivered within the timeframe allocated.

The Katoni Way – With no as-build drawings available, we carried out an offshore laser scan survey of the deluge skid steelwork. The client was unable to provide data sheets on the existing deluge skid, therefore we contacted the manufacturer to ascertain the specification of the 2 No. deluge skid cabinets. We then structurally analysed the existing steelwork under both normal operating and extreme storm load conditions to identify the current and potential utilisation of the beam. Understanding the utilisation of the steelwork, allowed us to identify and design the best solution. To relieve the 406 UB of some loading, a lateral tie beam was bolted in place between the deluge skid and adjacent PAU17 steelwork. Then 2 No. fabricated channel sections were installed back to back with the web along the 1.2m length and bolted to the top and bottom flanges, thus increasing the member properties of the combined section. Finally, the grating was reinstated with some transverse bars being cut which clashed with the bolt heads protruding the top flange of the beam.

Project delivered on time and on budget