scholarly journals Concepts for lifetime efficient supply of power and heat to offshore installations in the North Sea

2017 ◽  
Vol 148 ◽  
pp. 860-875 ◽  
Author(s):  
Luca Riboldi ◽  
Lars O. Nord
Keyword(s):  
North Sea ◽  
The North ◽  
Offshore Installations ◽  
The North Sea

scholarly journals A prospective observational study of why people are medically evacuated from offshore installations in the North Sea

BMJ Open ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. e037558
Author(s):  
Anne Waje-Andreassen ◽  
Øyvind Østerås ◽  
Guttorm Brattebø
Keyword(s):  
Observational Study ◽  
North Sea ◽  
Prospective Observational Study ◽  
Oil And Gas ◽  
Record System ◽  
The North ◽  
Transport Services ◽  
Offshore Installations ◽  
Severity Scores ◽  
The North Sea

ObjectivesFew studies have described evacuations due to medical emergencies from the offshore installations in the North Sea, though efficient medical service is essential for the industrial activities in this area. The major oil- and gas-producing companies’ search and rescue (SAR) service is responsible for medical evacuations. Using a prospective approach, we describe the characteristics of patients evacuated by SAR.Design and settingA prospective observational study of the offshore primary care provided by SAR in the North Sea.MethodsPatients were identified by linking flight information from air transport services in 2015/2016 and the company’s medical record system. Standardised forms filled out by SAR nurses during the evacuation were also analysed. In-hospital information was obtained retrospectively from Haukeland University Hospital’s information system.ResultsA total of 381 persons (88% men) were evacuated during the study period. Twenty-seven per cent of missions were due to chest pain and 18% due to trauma. The mean age was 46.0 years. Severity scores were higher for cases due to medical conditions compared with trauma, but the scores were relatively low compared with onshore emergency missions. The busiest months were May, July and December. Weekends were the busiest days.ConclusionThree times as many evacuations from offshore installations are performed due to acute illness than trauma, and cardiac problems are the most common. Although most patients are not severely physiologically deranged, the study documents a need for competent SAR services 24 hours a day year-round. Training and certification should be tailored for the SAR service, as the offshore health service structure and geography differs from the structure onshore.

Gas Turbine Intake Filter Systems Related to Offshore Platform Installations

1985 ◽  
Author(s):  
M. H. P. Kimm ◽  
D. Langlands
Keyword(s):  
Gas Turbine ◽  
North Sea ◽  
Specific Reference ◽  
Ideal Condition ◽  
Air Filtration ◽  
Contributing Factors ◽  
The North ◽  
Offshore Installations ◽  
Production Platform ◽  
The North Sea

This Paper covers various aspects with respect to the selection and operation of air filtration associated to offshore gas turbine installations. As the Offshore North Sea industry moves into its second decade, Operators are still trying to improve machine availability and reduce maintenance costs. One of the main contributing factors in their failure to achieve the ideal condition has been poor inlet air filtration caused by bad design and incorrect filter selection. The majority of offshore installations are equipped with filter systems which were originally designed for use on ocean-going vessels. The performance of what has become known as the “High Velocity Salt Eliminator System” has, in most cases, been unsatisfactory, thereby creating a necessity for a continuing search into alternative filter systems. The experiences of most Operators in the North Sea have been very similar, and examination of the platform environment explains why this should be the case. To emphasize the affects of poor air filtration and the savings that can be achieved by the Operator in recognising and correcting the problems, specific reference is made to the experience of Mobil North Sea with the Beryl Alpha Production Platform.

Long-term dynamics of fouling communities found on offshore installations in the North Sea

2003 ◽  
Vol 83 (5) ◽  
pp. 897-901 ◽  
Author(s):  
P. Whomersley ◽  
G.B. Picken
Keyword(s):  
North Sea ◽  
Offshore Platforms ◽  
Fouling Communities ◽  
The North ◽  
Offshore Installations ◽  
Oil Export ◽  
The North Sea ◽  
Northern North Sea ◽  
Fouling Organisms

Inspection videos of four offshore platforms in the central and northern North Sea were used to study the development of fouling communities on clamps and guides of oil export risers over an 11-y period (1989–2000). Results from multivariate analyses (multi-dimensional scaling and analysis of similarities) indicated that distinct assemblages developed in different geographical locations. These differences were mainly due to the protracted development of theMetridium senile(Cnidaria: Actinaria) zone on the northern sector platforms. The vertical zonation of fouling organisms was similar on all installations, although the water depth at platform locations varied from 80 to 169 m, indicating that fouling organisms display a wide bathymetric tolerance. This study has highlighted the value of long-term data present in operational inspection videos for the study of fouling communities.

Removal of Topside Units in a Single Lift: The Repsol Yme Field Case Study

2018 ◽  
Author(s):  
Beatriz Alonso Castro ◽  
Terje Birkenes ◽  
Huib Oosterveld
Keyword(s):  
North Sea ◽  
Ballast Water ◽  
Structural Integrity ◽  
Dry Weight ◽  
The North ◽  
Offshore Installations ◽  
Safety And Health ◽  
The North Sea ◽  
The Uk ◽  
Water Tanks

Decommissioning is an emerging sector in the UK and Norway, accounting for 2% of total industry expenditure in 2010 increasing to 8% in 2017. In accordance with existing regulations in the North Sea (OSPAR), dumping, and leaving wholly or partly in place disused offshore installations within the maritime area is prohibited. Over the next eight years, 200 platforms are expected to be removed in the North Sea. There are a number of methods to remove offshore installations: Piece small, Reverse installation and Single lift. In the Single lift approach the jacket or the topside is removed in one piece, minimizing significantly the time offshore and therefore the safety and health incidents. But the Piece Small and Reverse Installation are the most common methods and are established and secure although are time consuming and labor intensive [1]. Several potential candidates for single lift technology at varying levels of technical readiness were considered in the past. The majority of the concepts remained on the drawing board, while some were awaiting project commitment. The only that was matured further than this is the Pioneering Spirit. Yme, its first commercial lift, gave this concept the “proven” status. The Yme MOPU, owned by Repsol, was a jack-up type platform standing on three steel legs of 3.5 m diameter. The dry weight of the MOPU was approximately 13,500 t. The Yme MOPU was a challenging unit to remove mainly for three reasons: The platform motions due to the lack of stiffness in the leg support, its position in contact with the caisson wellhead platform, and the fact that the legs could not be pre-cut before the operation. The method selected to remove the platform was Single lift, using the dynamically positioned platform installation and removal vessel Pioneering Spirit. The lifting arrangement consisted of 12 lift beams combined and connected in pairs to yokes. Five specifically designed yokes were installed. The yokes connect the TLS with the MOPU. The structural integrity of each interface was assessed with FE analysis. The Ballast system was used to provide additional clearance. Pioneering Spirit has a total of eighty-seven ballast water tanks, including four so called ‘Quick Drop Ballast Water Tanks’. The removal of the MOPU was performed successfully the 22nd August 2016, after two days work offshore.

Decommissioning of Offshore Installations — Experience Related to Safety and Environment and the Philosopy: “How Clean is Clean Enough?”

2002 ◽  
Author(s):  
Mina Hynne Bjerkelund
Keyword(s):  
North Sea ◽  
Work Performance ◽  
Environmental Aspects ◽  
The North ◽  
Offshore Installations ◽  
Good Reputation ◽  
The North Sea ◽  
Offshore Industry ◽  
Safety And Environment ◽  
Unknown Period

This paper will give a brief presentation of experience gained over the last 5–10 years of decommissioning of offshore installations in the North Sea. Focus is given to safety and environment issues, as this is the driven factor towards decommissioning and deconstruction of offshore installations. The establishment of cleaning criteria is based on experience from The Ekofisk I Field where a number of installations should be out of production and shut down prior to final disposal. The disposal solution was not yet defined; therefore a “cold phase” was defined. The installations would stay in place for an unknown period of time. Cleaning of large storage tanks, such as Brent Spar, Maureen Alpha and The Doris Tank is a challenge due to the size and layout of the tanks and the content, such as H2S, wax, scale, sediments, etc. Special cleaning techniques and methods are developed for each tank. Reuse of installation or part of the installation is a target. Re use of the installations to what they were originally designed for, has been a main issue, but not yet succeeded. In the North Sea, no installations so far have been re used. Lot of effort is put into risk management and waste management. Risk related to deconstruction work, both onshore and offshore, is a major concern. All statistics demonstrates challenges towards work performance in deconstruction projects. It is important for the offshore industry to maintain a good reputation and to be a reliable and orderly partner for safety and environmental aspects of the industry.

Experience With DLE Turbines at Offshore Installations

2000 ◽  
Author(s):  
Conrad Carstensen ◽  
Roald Skorping
Keyword(s):  
Power Plant ◽  
North Sea ◽  
Case History ◽  
Gas Turbines ◽  
The North ◽  
Air Emission ◽  
Offshore Installations ◽  
The North Sea ◽  
Technical Challenges

In this paper experience with some of the first gas turbines equipped with dry low NOx combustors installed in the North Sea is presented. The case history covers LM2500 and LM6000 gas turbines. The paper outlines further some of the technical challenges for future applications in conformance with recent revisions of power plant air emission guidelines.

A Survey of Traffic Passing Offshore Installations in the North Sea

1984 ◽  
Vol 37 (2) ◽  
pp. 251-263
Author(s):  
M. A. F. Pyman ◽  
P. R. Lyon ◽  
G. Rowe May
Keyword(s):  
North Sea ◽  
Oil And Gas ◽  
Offshore Platforms ◽  
The North ◽  
Offshore Installations ◽  
The North Sea ◽  
The Uk

Since drilling for oil and gas began in the North Sea in the mid 1960s, the possibility of merchant ships colliding with offshore platforms or rigs, has been of concern to both government and operators. There are nearly 100 fixed and floating installations in the UK sector of the North Sea; they vary in size, location and type of construction, but in all cases, collision would pose serious risks to life, pollution and loss of production. Some platforms are near busy shipping lanes and some have several hundred personnel on them at certain times.

Initiative on Structural Integrity Management of Ageing North Sea Installations

2008 ◽  
Author(s):  
A. Stacey ◽  
M. Birkinshaw
Keyword(s):  
North Sea ◽  
Structural Integrity ◽  
Health And Safety ◽  
Current Phase ◽  
Front Line ◽  
The North ◽  
Offshore Installations ◽  
Integrity Management ◽  
The North Sea ◽  
Operational Activity

With an ever-increasing population of ageing offshore installations in the North Sea, the Health and Safety Executive’s (HSE’s) Offshore Safety Division has focused its front-line operational activity in recent years on the structural integrity management process and establishing the extent of any deterioration in structural integrity. The current phase of work, the Structural Integrity Management Inspection Programme (SIMIP), is described and the findings to date are presented in this paper.

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