The world’s largest semi-submersible crane vessel Sleipnir has safely put in Dana Petroleum’s new P11-Unity platform, which at 395 metric tons is without doubt one of the world’s smallest platforms. Heerema was contracted for the transportation and set up of P11-Unity by HSM Offshore, who fabricated the platform at their yard in Schiedam, The Netherlands.
On October 22, Sleipnir safely and sustainably lifted the P11-Unity platform from the vessel’s deck to the seabed, with this operation taking round an hour. P11-Unity will help the event of the Witte de With and Van Ghent East fuel accumulations, utilizing a brand new ‘back-to-basics’ design platform to supply two fields.
Heerema’s scope included the lifted load-out of the P11-Unity platform from HSM Offshore’s quayside at Schiedam. The raise was executed by Bonn & Mees on October 15 and the platform was loaded-out on to the 122 m lengthy Heerema owned barge H-406. After that the P11-Unity platform was transferred to Sleipnir’s mooring location on the Port of Rotterdam by Müller, arriving on October 17.
After the completion of the Tolmount set up, Sleipnir arrived within the Port of Rotterdam to raise the P11-Unity platform on to the vessel’s deck on October 19 and secured the tripod for transportation to the offshore set up location. The vessel mobilized on October 22, and after an eight hour sail Sleipnir arrived on location, in Block P11b, round 67 km off the coast of Scheveningen, The Netherlands.
HSM Offshore managed the development and set up of the platform on behalf of Dana Petroleum, together with contracting Heerema’s Sleipnir for the offshore scope. P11 Unity was constructed on the HSM Offshore yard in Schiedam, with the HSM workforce spending round 28000 working hours on the platform.
The P11-Unity platform is a minimal services wellhead platform that was pre-commissioned onshore to reduce the offshore building scope. The platform is designed for marine entry solely, utilizing related ideas to the offshore wind business. It can be remotely operated from the host P11-B-De Ruyter platform, additionally operated by Dana Petroleum. The P11b Unity Development Project expects first fuel within the second half of 2021.
(Source and picture: Heerema)


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