Advanced Pipeline Riser Pull-In Analysis for a Fixed Offshore Production Platform

2009 ◽  
Author(s):  
Weiyong Qiu ◽  
Mark Chang ◽  
Xujie Liu ◽  
Jim Bob King
Keyword(s):  
Offshore Production ◽  
Production Platform

scholarly journals A Diode-MMC AC/DC Hub for Connecting Offshore Wind Farm and Offshore Production Platform

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3759
Author(s):  
Kai Huang ◽  
Lie Xu ◽  
Guangchen Liu
Keyword(s):  
Wind Power ◽  
Wind Farm ◽  
Offshore Wind ◽  
System Control ◽  
Dc Voltage ◽  
Offshore Wind Power ◽  
Offshore Production ◽  
Production Platform ◽  
In Series ◽  
Dc Voltage Control

A diode rectifier-modular multilevel converter AC/DC hub (DR-MMC Hub) is proposed to integrate offshore wind power to the onshore DC network and offshore production platforms (e.g., oil/gas and hydrogen production plants) with different DC voltage levels. The DR and MMCs are connected in parallel at the offshore AC collection network to integrate offshore wind power, and in series at the DC terminals of the offshore production platform and the onshore DC network. Compared with conventional parallel-connected DR-MMC HVDC systems, the proposed DR-MMC hub reduces the required MMC converter rating, leading to lower investment cost and power loss. System control of the DR-MMC AC/DC hub is designed based on the operation requirements of the offshore production platform, considering different control modes (power control or DC voltage control). System behaviors and requirements during AC and DC faults are investigated, and hybrid MMCs with half-bridge and full-bridge sub-modules (HBSMs and FBSMs) are used for safe operation during DC faults. Simulation results based on PSCAD/EMTDC validate the operation of the DR-MMC hub.

BUSINESS-OPERATIONAL CONTINUITY PLANNING

2001 ◽  
Vol 2001 (2) ◽  
pp. 903-908 ◽  
Author(s):  
Glenn F. Epler
Keyword(s):  
Impact Analysis ◽  
Planning Process ◽  
Management Plan ◽  
Major Incident ◽  
State Regulations ◽  
Continuity Planning ◽  
Offshore Production ◽  
Production Platform ◽  
The Face ◽  
Crisis Management Plan

ABSTRACT U.S. federal and state regulations require industry to develop and maintain detailed crisis and emergency response plans. These plans are, for the most part, well thought out and detailed. As a result, along with extensive training and exercise programs, industry preparedness is better than it has ever been to respond to and manage an emergency. But how well prepared is industry to handle the business or operational continuity aspects of a crisis or emergency? What plans are in place to deal with the requirement for continuing essential business functions in the face of a disaster? If a major incident occurs to a refinery, terminal, or offshore production platform that requires it to be taken off-line, or damages it beyond repair, are there plans in place to minimize the impacts on the rest of the organization and on the downstream customers? How will this be done simultaneously while managing the response? This paper addresses those needs and discusses the requirements that companies in the oil and chemical industry should consider in developing business and operational continuity plans. It explains a multi-step planning process that is being used by many companies around the world to maintain their business edge when a crisis or disaster strikes. This planning process includes such functions as conducting a risk analysis and business impact analysis, developing mitigation and recovery strategies, drafting a continuity plan, developing an awareness program, and building a training and exercising program. The paper also looks at the similarities between business and operational continuity plans and a company's emergency or crisis management plan and address ways in which the plans may be integrated.

On the Design Considerations of New Offloading Hose Applied on a Turret Moored FPSO

2017 ◽  
Author(s):  
Decao Yin ◽  
Ivar Fylling ◽  
Halvor Lie ◽  
Rolf J. Baarholm ◽  
Timothy E. Kendon
Keyword(s):  
Limit State ◽  
Petroleum Products ◽  
Operating Conditions ◽  
Normal Operation ◽  
Ultimate Limit State ◽  
Operation Condition ◽  
Utilization Factor ◽  
Offshore Production ◽  
Axial Forces ◽  
Production Platform

Offloading hoses are used to transfer crude oil or liquid petroleum products from a fixed offshore production platform/floating production, storage and offloading (FPSO) unit to shuttle tankers. The hoses are subjected to environmental loads that are mainly waves, current, and vessel motions from both FPSO and the shuttle tanker. New offloading hoses were planned to be applied in a FPSO in harsh environment, and a design analysis was done in this connection. Numerical simulations were performed on ultimate limit state (ULS), serviceability limit state (SLS) and accidental limit state (ALS) by using the software RIFLEX [2]. Critical responses such as curvature and axial forces are checked. The following conditions are checked: 1. Normal operation condition with oil filled hose 2. Connect operation condition, floating gas filled hose 3. Emergency disconnect condition A SIMA [3] workflow was established to calculate accumulated fatigue damage of all the elements of the offloading hose model. For the new offloading hose, it is important to have a combined bending-tension loading capacity check. A utilization factor is proposed that possibly may be generalized. The results show that the specified hose has ample capacity for the considered operating conditions for the shuttle tanker to stay in any position within the 2nd emergency shut down sector (ESD2).

Metabolic engineering of CHO cells to prepare glycoproteins

2018 ◽  
Vol 2 (3) ◽  
pp. 433-442 ◽  
Author(s):  
Qiong Wang ◽  
Michael J. Betenbaugh
Keyword(s):  
Metabolic Engineering ◽  
Cho Cells ◽  
Genetic Manipulation ◽  
Chinese Hamster ◽  
Post Translational Modification ◽  
Effector Functions ◽  
Recombinant Glycoproteins ◽  
Production Platform ◽  
Chemical Inhibitors ◽  
Amino Acid Mutations

As a complex and common post-translational modification, N-linked glycosylation affects a recombinant glycoprotein's biological activity and efficacy. For example, the α1,6-fucosylation significantly affects antibody-dependent cellular cytotoxicity and α2,6-sialylation is critical for antibody anti-inflammatory activity. Terminal sialylation is important for a glycoprotein's circulatory half-life. Chinese hamster ovary (CHO) cells are currently the predominant recombinant protein production platform, and, in this review, the characteristics of CHO glycosylation are summarized. Moreover, recent and current metabolic engineering strategies for tailoring glycoprotein fucosylation and sialylation in CHO cells, intensely investigated in the past decades, are described. One approach for reducing α1,6-fucosylation is through inhibiting fucosyltransferase (FUT8) expression by knockdown and knockout methods. Another approach to modulate fucosylation is through inhibition of multiple genes in the fucosylation biosynthesis pathway or through chemical inhibitors. To modulate antibody sialylation of the fragment crystallizable region, expressions of sialyltransferase and galactotransferase individually or together with amino acid mutations can affect antibody glycoforms and further influence antibody effector functions. The inhibition of sialidase expression and chemical supplementations are also effective and complementary approaches to improve the sialylation levels on recombinant glycoproteins. The engineering of CHO cells or protein sequence to control glycoforms to produce more homogenous glycans is an emerging topic. For modulating the glycosylation metabolic pathways, the interplay of multiple glyco-gene knockouts and knockins and the combination of multiple approaches, including genetic manipulation, protein engineering and chemical supplementation, are detailed in order to achieve specific glycan profiles on recombinant glycoproteins for superior biological function and effectiveness.

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