A New Method for Determining the Design Sloshing Loads for LNG FPSOs

2014 ◽  
Author(s):  
Jeom Kee Paik ◽  
Sang Eui Lee ◽  
Bong Ju Kim ◽  
Jung Kwan Seo ◽  
Yeon Chul Ha ◽  
...  
Keyword(s):  
Natural Gas ◽  
Flow Chart ◽  
New Method ◽  
Storage Tanks ◽  
Operational Conditions ◽  
Oceanic Region ◽  
Liquid Natural Gas

The aim of this study was to develop a new method for determining nominal values for sloshing loads in the design of storage tanks in LNG FPSO (liquid natural gas, floating production, storage and offloading units). Details of the procedure are presented in a flow chart showing the key sub-tasks. The applicability of the method is demonstrated using an example of a hypothetical LNG FPSO operating in a natural gas site off a hypothetical oceanic region. It is concluded that the developed method is useful for determining the design sloshing loads of storage tanks in ship-shaped offshore LNG installations in combination with virtual metocean data and operational conditions.

Toward a Probabilistic Approach to Determine Nominal Values of Tank Sloshing Loads in Structural Design of Liquefied Natural Gas FPSOs

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Jeom Kee Paik ◽  
Sang Eui Lee ◽  
Bong Ju Kim ◽  
Jung Kwan Seo ◽  
Yeon Chul Ha ◽  
...  
Keyword(s):  
Natural Gas ◽  
Structural Design ◽  
Probabilistic Approach ◽  
Liquefied Natural Gas ◽  
Flow Chart ◽  
Impact Loads ◽  
Operational Conditions ◽  
Oceanic Region ◽  
Design Loads ◽  
Tank Sloshing

The aim of this study is to develop a new probabilistic approach to determine nominal values for tank sloshing loads in structural design of LNG FPSO (liquefied natural gas, floating production, storage, and offloading units). Details of the proposed procedure are presented in a flow chart showing the key subtasks. The applicability of the method is demonstrated using an example of a hypothetical LNG FPSO operating in a natural gas site off a hypothetical oceanic region. It is noted that the proposed method is still under development for determining reliable estimates of extreme sloshing induced impact loads. It is concluded that the developed method is useful for determining the sloshing design loads in ship-shaped offshore LNG installations in combination with virtual metocean data and operational conditions.

scholarly journals Rollover of Liquid Natural Gas in a Storage Tank: A Numerical Simulation

2021 ◽  
Author(s):  
Yinbin Lu ◽  
Chenwei Liang
Keyword(s):  
Natural Gas ◽  
Storage Tank ◽  
Initial Density ◽  
Critical Density ◽  
Liquefied Natural Gas ◽  
Density Difference ◽  
Storage Tanks ◽  
Exponential Functions ◽  
Double Exponential ◽  
Liquid Natural Gas

In the filling and transportation processes of liquefied natural gas (LNG), the safety of LNG storage tanks is compromised because of rollover phenomenon. As such, the rollover factors of LNG in a storage tank should be identified to prevent or weaken the rollover intensity of LNG. In this study, the rollover behavior of LNG in a storage tank is numerically simulated. The density of the two layers in a LNG storage tank is related to temperature in our numerical model. It is found that the greater the significant initial density difference (range of 1-12 kg·m-3) is, the more obvious the LNG rollover will be. A density difference of 7.5 kg·m-3 is found as the critical density difference in the present work. When the initial density difference exceeds the critical density difference, the LNG rollover coefficients increase dramatically. Moreover, an LNG rollover model with two daughter models is proposed, which are divided by the critical initial density difference, i.e., a cubic relationship between rollover coefficients and the initial density difference when the density difference is less than 7.5 kg·m-3 and secondly, a linear relationship between the rollover coefficient and the double exponential functions when the density difference is larger than 7.5 kg·m-3.

Blast-resistant buildings for Australia's North-West shelf liquid natural gas plant

1990 ◽  
Vol 9 (1-4) ◽  
pp. 175-197
Author(s):  
C. Turnell ◽  
N.W. Murray ◽  
I.D. Bennetts
Keyword(s):  
Natural Gas ◽  
North West ◽  
Liquid Natural Gas

Water Mixing and Renewal in Circular Cross-Section Storage Tanks as Influenced by Configuration and Operational Conditions

2021 ◽  
Vol 147 (12) ◽  
Author(s):  
Alexandre Pinheiro ◽  
Laura Monteiro ◽  
Joana Carneiro ◽  
Maria do Céu Almeida ◽  
Dídia Covas
Keyword(s):  
Cross Section ◽  
Circular Cross Section ◽  
Storage Tanks ◽  
Water Mixing ◽  
Operational Conditions

The Lay-Up and Reactivation of LNG Tankers: Lessons Learned

1994 ◽  
Vol 10 (03) ◽  
pp. 174-183
Author(s):  
John W. Boylston ◽  
Paul J. Riley ◽  
Gary W. Van Tassel
Keyword(s):  
Natural Gas ◽  
Capital Cost ◽  
Lessons Learned ◽  
Inert Gas ◽  
Ballast Tank ◽  
Economic Decisions ◽  
Liquid Natural Gas ◽  
Gas Plants

The Liquid natural gas (LNG) industry went from a projected boom in the 1970's to a contracted industry in the 1980's, when many ships were either permanently or temporarily laid up. In the 1990s, many laid-up LNG carriers are being reactivated after as many as 12 years in lay-up. While the capital cost of an LNG carrier should dictate maximum preservation of the asset, the LNG industry is not immune to having to make hard economic decisions during slack times. In this paper, the authors present specific alternate lay-up procedures, together with the relative costs of these alternatives. LNG carriers are steam vessels, as are many of the vessels in the Ready Reserve Fleet (RRF). However, many of the conclusions reached can also be applied to motor vessels, and as such could be of interest to operators and shipyards in all phases of the RRF program. The subjects of dehumidification, inert gas plants, ballast tank coatings and drydocking, among others, are discussed.

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