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Structural Integrity Management Inspection History as a Tool

Offshore rig - black and white

When operating an aging semi-sub in the harsh conditions experienced in the North Sea this winter, you want to be confident that the structural integrity is acceptable. Axess is the client’s partner to control structural integrity.

 

Many rigs are operating far beyond the initial design fatigue life. But with old age comes long experience. Axess assess the extensive inspection and crack history with a reliability-based integrity program called AIMS (Assessment Integrity Management Structure) to make clients able to extend service intervals for aging units from 2.5 to 5 years. Axess challenge the conservative assumptions from the structural analyses made. The actual fatigue life of a structural member depends very much on the small details.

Axess Structural Integrity Management (SIM) department has trained structural engineers with knowledge and emphasis on the effect fabrication quality, detailed design and small modifications have on actual fatigue life. On some rigs Axess also performs strain gauge measurements at special areas for years to be able to adjust structural analysis models and help achieve longer and more realistic fatigue life values.

SIM also has a highly experienced Marine Structural Analysis team which can do new global and local analyses on both the maximum loads from extreme weather on the hull and the fatigue of repeated loads from operating in harsh conditions year after year. More importantly our team assess the extensive set of analyses performed by others, helps the client verify them and make decisions as a result of them. 

RENEWAL SURVEY

Axess uses the AIMS follow up regime extended with a level of detail more extensive than the standard DNV IIP. It has detailed in-service fatigue analyses, RBI analyses, including inspection history and is further extended with As-is description and improved follow up regime for inspection repair, mod- ifications and weld improvement. AIMS has a probabilistic approach that assesses the findings compared to what theory predicts. Axess uses the inspection results to modify the in-service inspection program.

When planning a renewal survey, the structural integrity engineer goes through the findings since last RS, defines or calculates accept criteria from the structural analyses and regulations and decides which findings need repair or modifications and what measures to take.

Axess_The AIMS Model

The yard stay is also the time to do bigger structural modifications to increase payload or stability. Some clients use Axess as a structural integrity partner to help control these projects. Axess assess which structural analyses the client’s sub supplier must provide and help verify the results. Reading through the reports is not sufficient quality assurance when it comes to structural analysis but one needs to go through the models run.

Verifying the results from the client’s perspective is important to control what actually needs to be done. At a yard stay the suggested modifications are many but taking the correct actions is key. Doing many modifications does not help if the important one is missed. Axess helps the client maintaining the level of safety while also controlling the modification scope.

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
15915 Katy Freeway, Suite 501
77094 Houston, TX
+1 (281) 994-0367
Ciudad del Carmen
+1 832 970 3748
Stavanger
Axess AS
Koppholen 25, 4313 Sandnes
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
Accra
Axess Petrorig Ghana Limited
3rd floor, The Pelican
8 Blohum Street, Dzorwulu, Accra, Ghana
+233 (0) 30 397 0548
Luanda
Rainha Ginga
127 Luanda, Angola
+27 82 202 5266
Cape Town
Axess Africa Ltd.
1 Nares Street
Observatory
7925 Cape Town
+27 82 202 5266
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
Filipstad Brygge 1, 3rd Floor
Oslo, Norway
(duty): +47 982 43 600
Busan
Axess Offshore Korea LLC
#103 (Aju-dong Hyunjin Evervil) B1 Yang 1-gil, Geoji-Si
Gyeongsangnam-do, South Korea
+82 10 8929 2016
Mumbai
Axess Offshore (Mumbai)
Alpha, 2nd Floor Unit No. 201
Hiranandani Gardens Powai, Mumbai
India
Singapore
Axess Offshore Pte Ltd
Nordic European Centre #05-31 South Wing
3 International Business Park
609927 Singapore
+65 6908 4174
Perth
Axess Offshore Australia Pty Ltd
140 St Georges Terrace L28,
Perth WA 6000
+61 4 3373 0739
Perth
Axess Offshore Australia Pty Ltd
140 St Georges Terrace L28,
Perth WA 6000
+61 4 3373 0739
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