One size fits all, Sleipnir installs one of the world's smallest platforms

In October 2020, Sleipnir safely installed Dana Petroleum’s P11-Unity platform, which at 395 metric tons is one of the world's smallest. Heerema was contracted for the transportation and installation of P11-Unity by HSM Offshore, who fabricated the platform at their yard in Schiedam, the Netherlands.

P11-Unity

The P11-Unity platform is a minimum facilities wellhead platform that was pre-commissioned onshore to minimize the offshore construction scope. The platform is designed for marine access only, using similar principles to the offshore wind industry. It will be remotely operated from the host P11-B-De Ruyter platform, also operated by Dana Petroleum. The P11b Unity Development Project expects first gas in the second half of 2021.

Transportation 

Heerema’s scope included the lifted load-out of the P11-Unity platform from HSM  Offshore’s quayside at Schiedam. The lift was executed by Bonn & Mees on October 15 and the platform was loaded-out onto the 122 m long Heerema owned barge H-406. After that the P11-Unity platform was transferred to Sleipnir’s mooring location at the Port of Rotterdam by Muller, arriving on October 17. 

Sleipnir arrived in the Port of Rotterdam to lift the P11-Unity platform on to the vessel’s deck on October 19 and secured the tripod for transportation to the offshore installation location. The vessel mobilized on October 22, and after an eight hour sail Sleipnir arrived on location, in Block P11b, around 67 km off the coast of Scheveningen, the Netherlands

Installation

On October 22, Sleipnir lifted the P11-Unity platform from the vessel's deck to the seabed, with this operation taking around one hour. 

The P11-Unity platform was delivered by HSM Offshore safely, timely, and with great accuracy. Even the smallest platforms deserve our utmost attention. Heerema's mighty Sleipnir completed the project by safely installing the platform at sea.

Martin Kooijman, HSM Offshore

Throughout the 55,000 working hours that were spent on this project up to installation, there were zero recordable HSE cases, the result of strong cooperation and high regard for safety from all parties.