International Offshore Research Articles

Strain concentrations at intersection regions of a multiplanar tubular DX-joint

A large-scale steel multiplanar tubular Double X-joint (DX-joint) specimen was tested such that its in-plane and out-of-plane braces were subjected to three different load cases of pure axial forces. The strain gradients at the joint intersection regions were measured and consequently the hot spot strain locations, and hence, the strain concentration factors (SNCFs) were determined. The shapes of the SNCF distributions and the peak SNCFs determined in the tests were found to be in good agreement with those obtained by finite element (FE) analyses, except for the load case where all the braces were subjected to axial tensile forces. In addition, the results at the peak hot-spot saddle locations were compared with those predicted using authors FE analyses, Efthymiou's influence function (IF) method (Efthymiou M. Development of SCF formulae and generalized influence functions for use in fatigue analysis. Proceedings of OTJ Conference, Surrey, UK, October 1988) and Romeijn's equations (Romeijn A, Puthli RS, De Koning CHM, Wardenier J. Stress and strain concentration factors of multiplanar joint made of circular hollow sections. Proceedings of the Second International Offshore and Polar Engineering Conference, San Francisco, USA, June 1992:384–93). Due to the multiplanar stiffening effect of the loaded out-of-plane braces, the IF method (Efthymiou M. Development of SCF formulae and generalized influence functions for use in fatigue analysis. Proceedings of OTJ Conference, Surrey, UK, October 1988) grossly overestimated the test results in the case where all the braces were subjected to axial tensile forces.

The effect of flaws on serviceability of oil and gas pipeline welds : Chaburkin, V.F. Proceedings of the 10th International Offshore Mechanics and Arctic Engineering Conference, Stavanger (Norway), 23 – 28 Jun. 1991, Vol. 2, Safety and Reliability, pp. 77–84. The American Society of Mechanical Engineers (1991)

The effect of flaws on serviceability of oil and gas pipeline welds : Chaburkin, V.F. Proceedings of the 10th International Offshore Mechanics and Arctic Engineering Conference, Stavanger (Norway), 23 – 28 Jun. 1991, Vol. 2, Safety and Reliability, pp. 77–84. The American Society of Mechanical Engineers (1991)

Methodologies for the assessment of defects in offshore pipelines and risers : Jones, D.G.; Hopkins, P. Proceedings of the 10th International Offshore Mechanics and Arctic Engineering Conference, Stavanger (Norway), 23 – 28 Jun. 1991, Vol. 5, Safety and Reliability, pp. 113–118. The American Society of Mechanical Engineers (1991)

Methodologies for the assessment of defects in offshore pipelines and risers : Jones, D.G.; Hopkins, P. Proceedings of the 10th International Offshore Mechanics and Arctic Engineering Conference, Stavanger (Norway), 23 – 28 Jun. 1991, Vol. 5, Safety and Reliability, pp. 113–118. The American Society of Mechanical Engineers (1991)

A critical review of contemporary Greek shipping policy 1981–1996

It has been argued that Greek shipping policy, during the whole post-war period, had mainly among its objectives the maximisation of the foreign exchange inflow from shipping. This objective has been achieved in the sense that shipping foreign exchange inflow was increasing up to and including 1981. For reasons explained, on board Greek flagged vessels foreign crews were allowed to work during the post-war period, a fact that has resulted — as shown by our research — in a foreign exchange payment of US$406 million per year. Naturally, foreign crews remit their wages to their countries. Fortunately, however, for Greek shipowners it was only in 1983 — under the pressure of the then acute shipping crisis — that Greek Government legislated that foreign crews should be paid in future not according to Greek crew wages but in accordance with the wages prevailing at their countries. Our research has shown that this policy measure benefited Greek shipping with US$321.4 million per year. Our analysis covers also further policy measures which constitute Greek shipping policy during the last 15 years. The cause of this article was to see a rather small economic nation like Greece taking policy measures for a giant (first world position) international offshore sector like its commercial shipping.

Development of small diameter in-line MFL inspection tools: a technical challenge: Laursen, P.; Atherton, D.L.; Proceedings of the 4th (1994) International Offshore and Polar Engineering Conference, Osaka (Japan), 10–15 Apr. 1994. Vol. IV, pp. 425–430. Edited by Y. Ueda, J.F. Dos Santos, I. Langen, Y. Tomita and K. Waagaard. ISOPE (1994) ISBN 1-880653-14-1

Development of small diameter in-line MFL inspection tools: a technical challenge: Laursen, P.; Atherton, D.L.; Proceedings of the 4th (1994) International Offshore and Polar Engineering Conference, Osaka (Japan), 10–15 Apr. 1994. Vol. IV, pp. 425–430. Edited by Y. Ueda, J.F. Dos Santos, I. Langen, Y. Tomita and K. Waagaard. ISOPE (1994) ISBN 1-880653-14-1

第7回国際海洋極地工学会議に参加して

第7回国際海洋極地工学会議に参加して

Detection of weld defects try computer aided X-ray radiography image processing : Suga, Y.; Kojima, K.; Tominaga, T. Proceedings of the 4th (1994) International Offshore and Polar Engineering Conference, Osaka (Japan), 10–15 Apr. 1994. Vol. IV, pp. 431–440. Edited by Y. Ueda, J.F. Dos Santos, I. Langen, Y. Tomita and K. Waagaard. ISOPE (1994) ISBN 1-880653-14-1

Detection of weld defects try computer aided X-ray radiography image processing : Suga, Y.; Kojima, K.; Tominaga, T. Proceedings of the 4th (1994) International Offshore and Polar Engineering Conference, Osaka (Japan), 10–15 Apr. 1994. Vol. IV, pp. 431–440. Edited by Y. Ueda, J.F. Dos Santos, I. Langen, Y. Tomita and K. Waagaard. ISOPE (1994) ISBN 1-880653-14-1

The effect of flaws on serviceability of oil and gas pipeline welds : Chahurkin, V.F. Proceedings of the 10th International Offshore Mechanics and Arctic Engineering Conference, Stavanger (Norway), 23–28 Jun. 1991, Vol. 2, Safety and Reliability, pp. 77–84. The American Society of Mechanical Engineers (1991)

The effect of flaws on serviceability of oil and gas pipeline welds : Chahurkin, V.F. Proceedings of the 10th International Offshore Mechanics and Arctic Engineering Conference, Stavanger (Norway), 23–28 Jun. 1991, Vol. 2, Safety and Reliability, pp. 77–84. The American Society of Mechanical Engineers (1991)

Malaysia’s International Offshore Financial Centre: An Examination of Labuan’s Development and Operations

In 1990, Malaysia announced its plan for a regional financial centre to be established on the island of Labuan. The government invested substantial funds in providing the appropriate legislation, infrastructure, and other factors required for a financial centre. This article ex amines Labuan's history thus far, and its current operations in offshore banking, offshore insurance, trust and funds management, and tax planning. The article concludes that while Labuan has made considerable progress in improving its competitive position against other centres, significantly more investment is still required.

Labuan IOFC: The Legal Environment and its Challenges

To stimulate the financial sector further, the Malaysian government has established an International Offshore Financial Centre (IOFC) on the island of Labuan. The setting‐up of the IOFC provides new challenges for the enforcement community. Recent financial scandals involving offshore financial centres have highlighted the need to protect the IOFC from crimes and financial abuses and at the same time to ensure confidentiality is adhered to. In the paper, the Malaysian Offshore Banking Act 1990 is examined. The Offshore Banking Act, under certain conditions, allows a public officer to gain access to banking information. Stringent entry requirements are applied to banks and businesses but the bottom line is that bankers are expected to exercise responsible banking and a high standard of prudence.

An intelligent input to inspection planning on offshore platforms taking gross human errors into account : Proceedings of the 10th International Offshore Mechanics and Arctic Engineering Conference, Stavanger (Norway), 23–28 Jun. 1991, Vol. 2, Safety and Reliability, pp. 297–303. The American Society of Mechanical Engineers (1991)

Major defects in a structure are often caused by human errors committed by designers, contractors, and operators. In spite of this, the inspection programmes are currently based on periodic inspections in various points of the structure and on initial defects and the propagation of defects such as cracks. In this paper, a new method of coping with human errors is introduced. The method is based on the following idea. During the design, construction, operation, and maintenance phases, gross human errors may give rise to various types of serious defects in the structures. A correlation matrix may therefore be defined relating human errors to structural defects. Based on an updated matrix including experience in terms of reports, a number of potential defects and their location may be suggested as a response to a detected defect. A prototype stand alone expert system, GERM, has been developed to illustrate and verify the method. Experience with the prototype has so far been promising. The aim of this paper is to present the philosophy behind the method and the experience obtained form the prototype.

The vibration experiment and analysis of platform A in Chengbei oil field : Jin Yangguo; Chang Zhengzhao Proceedings of the 6th International Offshore Mechanics and Artic Engineering Symposium, Texas (United States), 1–6 Mar. 1987. pp. 525–530. The American Society of Mechanical Engineers

The vibration experiment and analysis of platform A in Chengbei oil field : Jin Yangguo; Chang Zhengzhao Proceedings of the 6th International Offshore Mechanics and Artic Engineering Symposium, Texas (United States), 1–6 Mar. 1987. pp. 525–530. The American Society of Mechanical Engineers

Mathematical Modeling and NDT: A State of the Art

Abstract During the past decade or so there have been significant advances in the mathematical modeling of nondestructive testing (NDT) techniques. The current state of modeling is reviewed, with the aim of demonstrating the important role that it can play in improving and validating NDT techniques and procedures. This paper was presented at the 6th International Offshore Mechanics and Arctic Engineering Symposium, (1987). Since that time, a number of advances have been made in mathematical modeling. A more recent review of mathematical modeling techniques, with additional references, is currently in preparation by the authors.

Nature’s Dynamometer: Hull Performance Profiles and Dynamic Resistance for Sailboat Hulls

A new method for predicting full-scale sailboat hull resistance from full-scale coasting tests is presented. A way to minimize the influence of the ship's own wave is based on the creation of a "dynamic resistance" curve from several tests. Experimental results from tests conducted on an International Offshore Rule type sailboat are presented. The results show promise for future practical applications.

Finite element study of the anomalous behavior of remote field eddy currents in tubular products : 38828 Palanisamy, R. Proceedings of the 7th International Offshore Mechanics and Arctic Engineering Symposium, Houston, Texas (United States), 7–12 Feb. 1988. pp 71–76. The American Society of Mechanical Engineers

Finite element study of the anomalous behavior of remote field eddy currents in tubular products : 38828 Palanisamy, R. Proceedings of the 7th International Offshore Mechanics and Arctic Engineering Symposium, Houston, Texas (United States), 7–12 Feb. 1988. pp 71–76. The American Society of Mechanical Engineers

STRATEGIC GROUP DYNAMICS .

A longitudinal study was conducted of strategic group dynamics over periods of economic stability, growth, and decline in international offshore oil-drilling. Some changes in group strategy were ob...

Strategic Group Dynamics

A longitudinal study was conducted of strategic group dynamics over periods of economic stability, growth, and decline in international offshore oil-drilling. Some changes in group strategy were ob...

Finite element modeling of remote-field eddy current problems for the nondestructive testing of metal tube 38827 Palanisamy, R. Proceedings of the 6th International Offshore Mechanics and Arctic Engineering Symposium, Texas (United States), 1–6 Mar. 1987. pp 503–512. The American Society of Mechanical Engineers

Finite element modeling of remote-field eddy current problems for the nondestructive testing of metal tube 38827 Palanisamy, R. Proceedings of the 6th International Offshore Mechanics and Arctic Engineering Symposium, Texas (United States), 1–6 Mar. 1987. pp 503–512. The American Society of Mechanical Engineers

Finite element modeling of remote-field eddy current problems for the nondestructive testing of metal tube : 38827 Palanisamy, R. Proceedings of the 6th International Offshore Mechanics and Arctic Engineering Symposium, Texas (United States), 1–6 Mar. 1987. pp 503–512. The American Society of Mechanical Engineers

Finite element modeling of remote-field eddy current problems for the nondestructive testing of metal tube : 38827 Palanisamy, R. Proceedings of the 6th International Offshore Mechanics and Arctic Engineering Symposium, Texas (United States), 1–6 Mar. 1987. pp 503–512. The American Society of Mechanical Engineers

The magnetic force on a spherical magnetic particle in the leakage field of a surface-breaking slot: 38850 Edwards, C.; Palmer, S.B. Proceedings of the 6th International Offshore Mechanics and Arctic Engineering Symposium, Texas (United States), 1–6 Mar. 1987. pp 547–552. The American Society of Mechanical Engineers.

The magnetic force on a spherical magnetic particle in the leakage field of a surface-breaking slot: 38850 Edwards, C.; Palmer, S.B. Proceedings of the 6th International Offshore Mechanics and Arctic Engineering Symposium, Texas (United States), 1–6 Mar. 1987. pp 547–552. The American Society of Mechanical Engineers.