Pioneering Spirit (ship)

The initial concept, by Allseas technical director W.P. Kaldenbach,[4] was of a vessel capable of lifting entire platforms, and in 1987 Allseas declared its intention to build it.[7] The initial idea featured two rigidly connected, self-propelled supertankers, with a large slot at the bows enabling it to install platform topsides in one piece. Early designs featured a flotation and ballasting system and active motion compensation system to facilitate a controlled transfer of a topsides’ weight from the vessel to a platform substructure. Allseas developed the original idea to include steel jacket installation, jackets and topsides removal and rigid pipelay capabilities.[8]

The emphasis switched from the conversion of two existing tankers to a new-build hull in 2004, though retaining the catamaran concept.[9] The decision was prompted by a lack of suitable vessels to convert, the lower costs associated with a new-build, and the need to house sophisticated equipment – such as a dynamic positioning system – in the hull.[4]

In 2007, twenty years after the idea was first conceived, Allseas announced plans to build the Pieter Schelte, a twin-hulled platform installation / decommissioning and pipelay vessel.[10] Named after the offshore pioneer Pieter Schelte (father of Heerema), the design featured a lifting system at its bows for lifting platform topsides up to 48,000 tonnes (53,000 short tons) and a lifting system at its stern for lifting steel jackets up to 25,000 tonnes (28,000 short tons). The design also included pipelay equipment to handle pipe diameters ranging from 15–175 cm (6–68 inches) at water depths exceeding 4,000 m (13,000 ft).[11]

Naming controversy

Detail at bow, showing new name Pioneering Spirit just below obscured original name Pieter Schelte

The vessel was originally named Pieter Schelte after the engineer Pieter Schelte Heerema, the father of Allseas' owner Edward Heerema. The original name caused controversy due to Pieter Schelte Heerema's service in the Waffen-SS during World War II.[21] After the war, he was arrested and sentenced to jail for three years, because of links to a Dutch company that conscripted slave labourers for the Nazi war effort, according to the Dutch National Institute for War Documentation. The court later released him after one and a half years. Allseas announced on Friday, 6 February 2015 that the vessel's name would be changed in response to the controversy.[22] Her new name, Pioneering Spirit, was announced after the weekend.[23]

Carrying a 5,500 t (6,100-short-ton) test platform in the bow slot (Aug 2016)[24]

Pioneering Spirit is the world's largest vessel, in terms of her gross tonnage (403,342 gt), breadth (123.75 m or 406 ft), and displacement (1,000,000 tonnes or 980,000 long tons).[4][2] The maximum 48,000-tonne (53,000-short-ton) topside lift capacity is achieved by operating as a semi-submersible. For removal of topsides, the vessel straddles the intended payload with the slot formed by the twin bows. The slot measures 122 m × 59 m (400 ft × 194 ft) (L×W). After straddling the payload, Pioneering Spirit takes on ballast to lower, and two sets of eight (one set per bow) retractable motion-compensated horizontal lifting beams are slid under the payload. Once the load is secure, the vessel offloads the ballast, rising in the water and partially transferring the load to the beams. In the final stage a fast lift system is used that lifts the payload up to 2.5 m (8.2 ft) in 15 s.[25]

Two tilting lift beams for the installation or removal of steel jackets, up to 25,000 tonnes (28,000 short tons) in weight, will be located at the vessel's stern.[26] A 5,000 tonnes (5,500 short tons) special purpose crane built by Huisman is scheduled for delivery in the second half of 2018. The tub mounted crane will be available for additional lifts for jacket and topsides installation such as pile handling and bridge installation.[27][28]

Stinger (left) and STF (centre) aboard Bumblebee; Pioneering Spirit in background on right

When equipped with the Stinger, Pioneering Spirit can be used to lay pipe. Pipe segments are welded together on board the vessel, then are placed on the Stinger, where they roll into the water. The Stinger is curved to guide the pipe to the bottom of the ocean. The Stinger itself weighs 4,200 tonnes (4,600 short tons) and measures 150 m (490 ft) long and 65 m (213 ft) wide.[29] It is attached to the Stinger Transition Frame (STF), which provides an interface between the Stinger and the vessel; the STF is installed in the bow slot when attached to the vessel. The Stinger Transition Frame weighs more than 1,600 tonnes (1,800 short tons) by itself.[30]

The vessel is equipped with eight, 20-cylinder (20V32/44CR) MAN 11,200 kW diesel generators providing a total installed power of 95 MW, driving 12 Rolls-Royce azimuth thrusters which provide dynamic positioning (DP3) and for propulsion. The vessel's maximum speed is 14 knots (26 km/h; 16 mph). The accommodation has room for 571 persons in two-berth cabins.[4]

Lift Capacity Upgrade

As per update on July 2019, Allseas is planning to upgrade the lift capacity from 48,000 tonnes to 60,000 tonnes. This reason for the same is to enable the removal of Statfjord A platform in the North Sea.[31] The details of the upgrade are currently unknown.

Pioneering Spirit performed her first commercial lift, removal of Repsol's 13,500-tonne (14,900-short-ton) Yme mobile offshore production unit (MOPU) on 22 August 2016.[32] Located in the Yme field in the Norwegian sector of the North Sea, approximately 100 km (54 nautical miles) west of Stavanger, the MOPU was a jack-up type platform standing on three, 3.5-metre (11 ft) diameter steel legs. The decision to remove the platform was made in 2013, and the contract for the removal of the topsides was subsequently awarded to Allseas. Pioneering Spirit collided with the caisson of the Yme platform during the removal.

On 28 April 2017 Pioneering Spirit performed the single-lift removal of Shell's 24,200-tonne (26,700-short-ton) Brent Delta topsides.[2][33] Located in the Brent field, approximately 186 km (100 nautical miles) off the northeast coast of Shetland, the iconic platform sat on a three-legged gravity-based structure in 140 m (460 ft) of water. The vessel delivered the topsides to Able UK's Seaton Port yard, Teesside, for disposal.[34]

Pioneering Spirit has done the installation of the offshore section of the Turkish Stream pipeline in the Black Sea. The pipeline construction started in May 2017 and it was finished in November 2018.[35][36] Starting from the Russian coast near the town of Anapa, the 930-kilometre (580 mi), 80-centimetre (32 in) diameter twin-pipeline will traverse the Black Sea at depths up to 2,200 m (7,200 ft) and emerge onshore in Turkey's Thrace region.[37]

She has installed three out of four platform topsides for phase one of the Johan Sverdrup development in offshore Norway. The drilling platform (DP) topside was installed in June 2018. The other two topsides named P1 and LQ were installed in March 2019. With P1 topside weighing 26,000 tons, this is one the heaviest single-lift executed offshore till date, after Wheatstone of 36,000 ton and Arkutun Dagi of 42,380 ton, both with the H 851.[38][39][40][41] The vessel is expected to return in 2022 to install P2 topside weighing 27,000 tons for phase two of the Johan Sverdrup development.[42]

It removed Valhall QP topside for Aker BP in June 2019. This structure was an accommodation platform in Valhall field, located in southern part of North Sea about 280km off the Norwegian coast.[43] Weighing 3800 ton, it is the lightest lift operation performed by the vessel.[44]

In June 2019 Pioneering Spirit also removed the Brent Bravo topside weighing 25,000 tonne located 186km off the coast of Scotland on the way to Norway. She is scheduled to remove the remaining two Brent field topsides for Shell, the 15,000 tonne Brent Alpha and 29,500 tonne Brent Charlie.[45]

• The original concept from 1989
• Pioneering Spirit". Allseas
• Pieter Schelte - "The project commences". (PDF). Allseas Group
• Pieter Schelte Cylinders
• Video