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Successful thruster replacement carried out offshore

A safe and cost-effective operation made possible with a team of experienced engineers


Client: Leading international energy company
Industry: Oil & Gas
Asset: FSU
Location: Norwegian Continental Shelf (NCS)
Year: 2019

Challenge

Thrusters are part of vessels’ positioning systems, which are required to keep vessels in station either by heading control or Dynamic Positioning (DP).

At times, clients may require urgent replacement of thruster(s). In one particular example, a client required an urgent replacement of one of the thrusters on its FSU, due to a leaking shaft bearing. It was urgent as it was necessary to continue operating within safe environmental limits with an intact dynamic positioning system.

However, there was no documentation on the lifting equipment. Moreover, the thruster was not designed for dismantling in accordance with best practices and standards on the NCS. The asset could also not be taken off hire nor disconnected from the turret.

The client thus contracted Axess Group to perform the thruster replacement, as we have experience doing so offshore.

Solution

As the particular FSU did not have a spare thruster, the old thruster had to be sent onshore to be refurbished. Axess acted as a bridge, connecting all the involved parties, and planned the various aspects necessary for project success, including logistics, design and procurement. In addition, using the tailor-made winches from our subsidiary, Alpa, the engineering team performed the lifting operation to replace the thruster offshore, while the asset was still in operation.

The old thruster that was sent onshore to be refurbished

(Photo: The old thruster that was sent onshore to be refurbished)

For this project, Axess utilised an in-house designed tool for handling the thruster. This removed the need for divers, who are typically used in this type of operation. The tool, designed according to NORSOK Standard R-002 Lifting Equipment, was remotely controlled by the engineers.

“We have carried out numerous thruster replacements offshore throughout the past 15 years for various types of vessels worldwide, including Europe and Asia-Pacific. We gain experience from each project to devise new methods and execute future projects more efficiently,” Tone Tomassen, Director of Sales, NCS said.

Axess’ engineer and the client’s team with the new thruster

(Photo: Axess’ engineer and the client’s team with the new thruster)

Results

Axess completed the thruster replacement on time, before the arrival of the winter season, thus avoiding the harsher environment. As the operation was carried out offshore, it helped the client to save time and costs. Furthermore, the removal of divers from the operation helped to enhance safety.

“Out of all the thruster replacement projects we have done so far, this project had one of the greatest number of both technical and planning challenges, which provided many learning points for our engineering team. We are proud to have completed this project successfully within the stipulated time frame and most importantly, safely,” Paal Thorsager, Project Manager said.

Axess’ engineer and the client’s team doing mechanical work on the thruster steering gear

(Photo: Axess’ engineer and the client’s team doing mechanical work on the thruster steering gear)


If you are interested in thruster replacements for your assets, please reach out to us.

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Contact Information

Molde
Axess AS
Oscar Hanssens vei 5
6415 MOLDE
+47 982 43 600
Aberdeen
Axess North Sea Ltd.
Units 6 & 19 Robert Leonard Centre
Howe Moss Drive, Kirkhill Industrial Estate, Dyce AB21 0GG, UK
(duty): +44(0) 7912212854
St. John's
Axess Baffin Inc.
702 Water Street, Suite 201
St. John's, Newfoundland
+1 709 758 7937
Bergen
Axess AS
Kokstadflaten 35
5257 Bergen
(duty): +47 982 43 600
Houston
Axess North America Inc
825 Town & Country Lane Suite 1200
Houston Tx. 77024
+1 (281) 994-0367
Ciudad del Carmen
Axess Operations De Mexico S de RL de CV
Calle Bosque de Ciruelos 180 PP 101
Colonia Bosque De Las Lomas CP 11700 Cuidad De Mexico
+52 938-152-7688
Georgetown
Axess Guyana Inc.
2 Avenue of the Republic, Georgetown, Guyana
Stavanger
Axess AS
Travbaneveien 3,
4031 Stavanger, Norway
(duty): +47 982 43 600
Rio de Janeiro
Axess do Brasil Ltda
Rua Dezenove de Fevereiro
171 - Botafogo
CEP 22280-030 Rio de Janeiro
+55 (21) 4108-0532
Trondheim
Axess AS
Nedre Bakklandet 58C
7014 Trondheim
(duty): +47 982 43 600
Orkanger
Axess AS
Grønøraveien 1
Orkanger
7300 Orkanger
(duty): +47 41 78 06 30
Oslo
Axess AS
Fridtjof Nansens plass 4
0160 Oslo, Norway
(duty): +47 982 43 600
Busan
Axess Offshore Korea LLC
22nd Floor KNN Tower, Centum-ro 30
2203-ho, Haeundae-gu
Busan, South Korea
+82 10 2696 2016
Dubai
Axess Middle East DMCC
807 X2 Tower, X Cluster
Jumeriah Lake Towers Dubai, UAE
+971 4565 7913
Mumbai
Axess AIM India Pvt Ltd
B2-306, 3rd Floor
Kanakia Boomerang,
Chandivali Firm Road
Andheri East, Mumbai- 400072, India
Singapore
Axess Offshore Pte Ltd
Nordic European Centre #05-31 South Wing
3 International Business Park
Singapore 609927
+65 6908 4174
Perth
Axess Offshore Australia Pty Ltd
304 Newcastle St
Perth WA 6000
+61 4 3373 0739
Cape Town
Axess Offshore Africa Ltd.
Office 106, 1st Floor, Block 2
Northgate Park, Brooklyn
Cape Town, South Africa
+27 82 202 5266
Luanda
Axess Offshore Africa Ltd.
Edificio Joia Rara, 3º Andar 3.5/3.6,
Av. Revolução de Outubro No 8, Cassenda, Maianga
Luanda, Angola
+27 (0) 87 148 4700
Accra
Axess Petrorig Ghana Limited
3rd floor, The Pelican
8 Blohum Street, Dzorwulu, Accra, Ghana
+233 (0) 30 397 0548
Perth
Axess Offshore Australia Pty Ltd
140 St Georges Terrace L28,
Perth WA 6000
+61 4 3373 0739
Molde Aberdeen St. John's Bergen Houston Ciudad del Carmen Georgetown Stavanger Rio de Janeiro Trondheim Orkanger Oslo Busan Dubai Mumbai Singapore Perth Cape Town Luanda Accra