The Role of the API Committee on Standardization of Offshore Structures

1990 ◽  
Author(s):  
M.Y. Berman ◽  
N.D. Birrell ◽  
J.T. Irick ◽  
G.C. Lee ◽  
M. Rubin ◽  
...  
Keyword(s):  
Offshore Structures

Offshore Hydrodynamics

1993 ◽  
Vol 115 (1) ◽  
pp. 2-5 ◽  
Author(s):  
T. Sarpkaya
Keyword(s):  
Dynamic Response ◽  
Materials Science ◽  
Offshore Structures ◽  
Research Issues ◽  
Offshore Engineering ◽  
Air Water Interface ◽  
Research Problems ◽  
Fundamental Research ◽  
Ocean Environment

In this paper, we present several applied as well as fundamental research problems related to the future needs of the offshore engineering. The paper starts out with a detailed discussion of the current uncertainties and constraints. Then, specific research issues on environmental input conditions, on the role of computational fluid dynamics, and on damping and dynamic response are presented. It is suggested that an appreciation of the input parameters, acquisition of extensive data to properly characterize the ocean environment, development of new methods and tools to acquire relevant data, extensive use of the computational methods, basic/applied research on the dynamic response and damping of structures, use of new materials, science-and-technology transfer from sister disciplines (e.g., aerospace industry, keeping in mind the complexities brought about by the presence of the air-water interface), and other related research will significantly enhance our ability to design and build a variety of safer and economical offshore structures in deeper waters as well as over marginal fields in the next few decades. This herculean effort will require several decades of complementary experimental, numerical and analytical studies of ocean-structure interaction which will serve to elucidate the basic as well as applied fluid mechanics phenomena relevant to the offshore mechanics.

Challenges in Deep Water Experiments: Hybrid Approach

2002 ◽  
Vol 124 (2) ◽  
pp. 90-96 ◽  
Author(s):  
Carl Trygve Stansberg ◽  
Harald Ormberg ◽  
Ola Oritsland
Keyword(s):  
Deep Water ◽  
Experimental Verification ◽  
Hybrid Methods ◽  
Hybrid Approach ◽  
Offshore Structures ◽  
Future Challenges ◽  
On Line ◽  
Set Up

An overview of challenges within hydrodynamic verification of deep-water offshore structures is given first. The role of model testing in the verification, as well as a range of relevant measured responses, are discussed. Various solutions for experimental verification of deep-water structures are considered. In particular, the combination of model tests with truncated set-up and computer simulations—the hybrid approach—is discussed. Two basic groups of hybrid methods are identified: Active (on-line) and passive (off-line). Most published works are on passive systems, of which a particular method is described. Case study examples with this procedure are reviewed and discussed, and future challenges are commented.

Decommissioning of large offshore structures – The role of an Independent Review Group (IRG)

2016 ◽  
Vol 113 ◽  
pp. 11-17 ◽  
Author(s):  
W.B. Wilkinson ◽  
T. Bakke ◽  
G.F. Clauss ◽  
R. Clements ◽  
W.D. Dover ◽  
...  
Keyword(s):  
Offshore Structures ◽  
Review Group ◽  
Independent Review

Effect of Short-Crestedness on Extreme Wave Impact: A Summary of Findings From the Joint Industry Project “ShorTCresT”

2015 ◽  
Author(s):  
Janou Hennig ◽  
Jule Scharnke ◽  
Chris Swan ◽  
Øistein Hagen ◽  
Kevin Ewans ◽  
...  
Keyword(s):  
Wave Breaking ◽  
Good Description ◽  
Spectral Characteristics ◽  
Offshore Structures ◽  
Wave Crest ◽  
Extreme Waves ◽  
Extreme Wave ◽  
Wave Impact ◽  
Directional Model

Long-crested waves are typically used in the design of offshore structures. However, the corresponding statistics, kinematics and loading are significantly different in short-crested waves and up to date, there is no state-of-the-art methodology to apply short-crested models instead. The objective of the “ShortCresT” Joint Industry Project was to take into account short-crestedness in the design of offshore structures against extreme waves based on a good description of their spectral characteristics, statistics, kinematics, breaking and loading and to deliver (empirical) design recommendations and methods. This paper gives an overview of the findings of ShorTCresT regarding wave crest and height distributions, a comparison of basin and field data, the role of wave breaking, the most realistic directional model, hindcast models as well as the related platform loading.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor
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