Complete environmental waste management

Gryphon Disposal Project, North Sea, UK


Maersk engaged with us in the early stages of project planning which allowed TWMA make adequate onshore preparations to execute the project.  Over 95% of the subsea material recovered from the Gryphon field was successfully reused or recycled, achieving significant landfill avoidance.

Having permanent onshore waste treatment facilities in Shetland, Aberdeen and Peterhead along with experienced and dedicated staff, allows TWMA to deliver a highly efficient waste management service to clients operating in this region.  Our Shetland facility was ideally located to support the Maersk Gryphon project because it simplified the logistics and allowed for quick vessel turnaround times

Amanda Massie

Environmental Services Manager

In 2013, TWMA completed a major project for Gryphon field operator Maersk Oil North Sea UK Ltd (Maersk Oil), to recycle and dispose of materials as part of the Gryphon Area Recovery Project.

Project Scope

In February 2011, severe storm weather in the UK North Sea caused the Gryphon FPSO vessel to move off station, resulting in damage to subsea structures and equipment.  TWMA’s work scope in the project included the onshore handling, transportation, cleaning, re-sizing and recycling of damaged risers, riser bases, flexible risers, umbilicals, mid-water arches and mattresses.

TWMA Solution

The project was completed over six campaigns between 2011 and 2013 at four locations across Shetland and the North-East of Scotland.  The main objective for TWMA was to maximise recycling and reuse options for the recovered materials, thus minimizing the volume of waste sent for landfill.

The results of the project were successful, achieving a total recycling and reuse rate of over 95% and an entirely incident free operation throughout.

Following recovery offshore by specialist vessel, the subsea structures and equipment were landed at quayside in Lerwick, Shetland, for cleaning and re-sizing prior to recycling/disposal.  Part of this operation was undertaken at TWMA’s own waste transfer facility in Vatster, Shetland, while some of the recovered materials were also shipped to Montrose, Angus, for processing with support from TWMA’s waste transfer facility in Tullos, Aberdeen.

Project Results

Materials recovered from the damaged equipment included scrap metal, plastic and concrete, of which 95% was suitable for recycling or reuse.

TWMA project managed the entire onshore disposal operation, which involved working closely with Maersk Oil and onshore authorities in Lerwick, Peterhead, Aberdeen and Montrose.

TWMA has extensive knowledge and several years of experience in managing recovered waste materials, with particular expertise in handling large subsea structures and equipment such as mid water arches, riser bases and flowlines for the decommissioning market. 

Material type

Weight (t)

Overall Recycled

Recovered Metallic (t)

Recovered Plastics (t)

Recovered Concrete (t)

Constructional Steel

435.580

100%

435.580

N/A

N/A

Concrete

388.940

100%

N/A

N/A

388.940

Umbilical

361.838

90.8%

150.523

177.979

N/A

Flexible Risers

1,358.200

96.4%

1,096.354

213.818

N/A

MWA Float

39.100

0%

0

0

N/A

TOTALS

2,583.658

95.3%

1,682.457

391.797

388.940

Table showing total tonnages recovered and recycling/disposal rates for Maersk Oil Gryphon project, 2011 - 2013

 

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