Design of Water Hammer Protection for FPSO Domestic Water System Based on AFT-Impulse

2020 ◽  
Author(s):  
Zhang Huan ◽  
Zhang Qipeng ◽  
Wang Chao ◽  
Xu Jiangguo ◽  
Kong Weiwen
Keyword(s):  
Working Conditions ◽  
Transient Analysis ◽  
Water System ◽  
Water Hammer ◽  
Network System ◽  
Pipe Network ◽  
Safe Operation ◽  
Domestic Water ◽  
Pipe Length ◽  
Control Factors

Abstract Due to the limitation of cabin space, FPSO domestic water pipe network system has the characteristics of long water delivery distance, more bending of pipeline and frequent opening and closing of valves, etc. The above characteristics are very likely to cause water hammer in the pipeline, resulting in increased risk of safe operation of pipe network system. In this paper, a FPSO domestic water system was taken as the research object. In view of the water hammer problem in the pipe network system, the model of FPSO domestic water system was established by using dynamic fluid analysis software AFT-Impulse, combined with the factors affecting the water hammer phenomenon (such as pipe diameter, velocity of wave, pipe length, pipeline roughness and valve closing time), the steady state analysis and transient analysis of multi-working conditions and multi-scenarios were realized to determine the main control factors. Based on the influence of main control factors, a comparison scheme of water hammer protection in FPSO domestic water system was proposed. Through the transient analysis of AFT-Impulse software under multi-working conditions, the optimal scheme of water hammer protection for FPSO domestic water system was obtained, which provided guarantee for the safe operation of the system.

Optimization Design of FPSO Central Cooling Water System Based on Pipe Network Fluid Analysis

2019 ◽  
Author(s):  
Huan Zhang ◽  
Hongtao Yuan ◽  
Chao Wang ◽  
Weiwen Kong ◽  
Jiangguo Xu ◽  
...  
Keyword(s):  
Water System ◽  
Cooling Water ◽  
Normal Operation ◽  
Network System ◽  
Pipe Network ◽  
Economic Point ◽  
Power Generator ◽  
System Integrity ◽  
Cooling Water System ◽  
The Impact

Abstract Marine power generator plays important role to guarantee the normal operation of all subsystems of FPSO, in which cooling device are emphasized on its reliability and stability. As the main cooling system of FPSO power generator, the design of central cooling water system is very important. Traditional pipeline network system design is mainly based on the design manual and empirical formula, which single pipeline is designed for circulation of different media. Lacking the concept of system integrity, which results in the weak integrated design without rational consideration. In this paper, a FPSO central cooling water system is taken as the research object. Based on the initial design scheme, it is different from the empirical and singularity of traditional design, and the impact of the pipe network of cooling water system to that of other systems in the whole vessel is put into consideration on the comprehensive way. From the economic point of view, the study on the pipe network of flow balance is carried out, and the optimization scheme of the central cooling water pipe network system is proposed.

Design of Water Hammer Protection for Fpso Domestic Water System Based on Aft-Impulse

2021 ◽  
Author(s):  
Zhang Huan ◽  
Zhang Qipeng ◽  
Wang Chao ◽  
Kong Weiwen ◽  
Xu Jiangguo
Keyword(s):  
Water System ◽  
Water Hammer ◽  
Domestic Water

Design of Water Hammer Protection for Fpso Domestic Water System Based on Aft-Impulse

2021 ◽  
Author(s):  
Zhang Huan ◽  
Zhang Qipeng ◽  
Wang Chao ◽  
Kong Weiwen ◽  
Xu Jiangguo
Keyword(s):  
Water System ◽  
Water Hammer ◽  
Domestic Water

The Stability Analysis of Slope of Shegang Protecting Dyke

2011 ◽  
Vol 261-263 ◽  
pp. 1841-1845
Author(s):  
Hui Qin Yao
Keyword(s):  
Stability Analysis ◽  
Working Conditions ◽  
Saturation Line ◽  
Dam Safety ◽  
Design Code ◽  
Embankment Dam ◽  
Safe Operation ◽  
Calculation Results ◽  
The Stability ◽  
Reinforcement Design

Appraisal of dam slope safety is essential for security and stability of the dyke that has been constructed for many years. According to the requirements of the appraisal of dam safety, the stability analysis of slope of Shegang dyke has been carried out by using Sweden circular-arc method, Bishop method, Engineer Corps method and Lowe method four methods under many kinds of working conditions and some conditions when the saturation line raising. Combined with the design code form embankment dam, the calculation results can be analyzed. The analysis can show that the security indexes of anti-slide under four kinds of working conditions and some conditions when the saturation line raising meet the requirements of the design code. This can provide basis for the reinforcement design of the dam, which also has a certain directive significance for the safe operation and observation of the dam in the future.

scholarly journals Building a Methodology for Assessing Service Quality under Intermittent Domestic Water Supply

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1164 ◽  
Author(s):  
Assia Mokssit ◽  
Bernard de Gouvello ◽  
Aurélie Chazerain ◽  
François Figuères ◽  
Bruno Tassin
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Water Distribution ◽  
Water System ◽  
Evaluation Framework ◽  
Domestic Water ◽  
Water Service ◽  
Quality Of Water ◽  
History Of

This document proposes a methodology for assessing the quality of water distribution service in the context of intermittent supply, based on a comparison of joint results from literature reviews and feedback from drinking water operators who had managed these networks, with standards for defining the quality of drinking water service. The paper begins by reviewing and proposing an analysis of the definition and characterization of intermittent water supply (IWS), highlighting some important findings. The diversity of approaches used to address the issue and the difficulty of defining a precise and detailed history of water supply in the affected systems broadens the spectrum of intermittency characterization and the problems it raises. The underlined results are then used to structure an evaluation framework for the water service and to develop improvement paths defined in the intermittent networks. The resulting framework highlights the means available to water stakeholders to assess their operational and management performance in achieving the improvement objectives defined by the environmental and socio-economic contexts in which the network operates. Practical examples of intermittent system management are collected from water system operators and presented for illustration purposes (Jeddah, Algiers, Port-au-Prince, Amman, Cartagena, Barranquilla, Mexico, Cancun, Saltillo, Mumbai, Delhi, Coimbatore …).

scholarly journals Microbiological water quality in a decentralized Arctic drinking water system

2020 ◽  
Vol 6 (7) ◽  
pp. 1855-1868
Author(s):  
Stephanie L. Gora ◽  
Tim Anaviapik Soucie ◽  
Nicole E. McCormick ◽  
C. Carolina Ontiveros ◽  
Vincent L'Hérault ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water System ◽  
Arctic Region ◽  
Water Source ◽  
Domestic Water ◽  
Point Of Use ◽  
System P ◽  
Drinking Water System ◽  
Microbiological Water Quality ◽  
Drinking Water Samples

Drinking water samples were collected from the water source, water delivery truck, domestic water storage tanks, and at the point of use in a decentralized drinking water system in Pond Inlet, Nunavut, a predominantly Inuit community in Canada's Arctic region.

New Designs in Fuel Dispensing System to Reduce Water Hammer

2013 ◽  
Author(s):  
Y. J. Liu ◽  
Z. Y. Wang ◽  
Z. Y. Huang ◽  
J. Lumkes
Keyword(s):  
Working Conditions ◽  
Rate Control ◽  
Water Hammer ◽  
Service Station ◽  
Start Up ◽  
Flow Rate Control ◽  
The Impact ◽  
Water Hammer Effect ◽  
Rapid Pressure ◽  
Nozzle Structure

Dispensers are used for refueling vehicles at the service station. During the refueling process, the velocity of fluid changes rapidly in several working conditions, which results in a rapid pressure increasing or a water hammer effect occurring. Water hammer, often causes leakage or failure of dispensers, occurs due to pump start-up and shut-down, valves opening or closing during the refueling process. This paper experimentally characterized and theoretically calculated the impact of water hammer on the dispensers at the service station. New designs of nozzle structure and new flow-rate control modes are made to reduce the water hammer in the fuel dispensing system. Eventually, all the water hammers are reduced significantly during the refueling process under the new design modes.

The Cause Analysis and Countermeasures of Waterlogging in Wuhan

2013 ◽  
Vol 357-360 ◽  
pp. 1962-1965 ◽  
Author(s):  
Wei Xia
Keyword(s):  
Natural Water ◽  
Drainage System ◽  
Extreme Weather ◽  
Network System ◽  
Pipe Network ◽  
Construction Sites ◽  
Cause Analysis ◽  
Gis Database ◽  
The City ◽  
Heavy Rains

In recent years, many cities have been severely affected by heavy rains, leaving the cities in bad condition. The cause of waterlogging in Wuhan is analyzed, which includes the influence of the extreme weather, the lagging drainage standard, the imperfection of pipe network system, the high hardening rate of the ground, the excessive construction sites and the reducing of the lakes. Then the countermeasures are proposed, which are improving the drainage standard, controlling and utilizing the rainwater source, upgrading the city drainage system, changing the hard ground trend of the city, preserving the natural water and establishing GIS database of the city drainage.

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