Effect of Partially Filled Spherical Cargo Tanks on the Roll Response of a Bargelike Vessel

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Wenhua Zhao ◽  
Finlay McPhail ◽  
Mike Efthymiou
Keyword(s):  
Natural Gas ◽  
Critical Role ◽  
Response Spectra ◽  
Liquefied Natural Gas ◽  
Offshore Structure ◽  
Operational Window ◽  
Response Amplitude Operators ◽  
First Time ◽  
Load Conditions ◽  
Game Changer

Floating liquefied natural gas (FLNG) is an offshore structure which enables liquefaction, storage, and offloading of natural gas. It is a game changer in offshore hydrocarbon development. Side-by-side offloading is a promising way of transferring liquefied natural gas (LNG) from FLNG to an LNG carrier. The roll response of LNG carriers, which plays a critical role, has been observed to be influenced by the liquid cargo motion inside the tanks. Therefore, the operational window for side-by-side offloading may not be estimated robustly using a simplified method which ignores the liquid cargo and considers only the ballast condition. This necessitates a scientific understanding of the roll responses of an LNG carrier at different load conditions. In this study, a series of model tests are conducted on a bargelike vessel with two spherical tanks. The response amplitude operators (RAOs) and response spectra of the vessel in different load conditions and different headings are investigated. The effect of intermediate cargo volumes on global roll response is, for the first time, examined for spherical cargo tanks. It is suggested that intermediate loading conditions with explicit inclusion of the effects of cargo sloshing is utilized in side-by-side operability studies to robustly ascertain offloading availability.

scholarly journals Development of Technical Requirements for On-Board Cryogenic Fuel Systems of Belaz Dump Trucks

2019 ◽  
Vol 297 ◽  
pp. 03002 ◽  
Author(s):  
Georgiy Dubov ◽  
Dmitriy Trukhmanov ◽  
Sergey Nokhrin ◽  
Aleksey Sergel
Keyword(s):  
Natural Gas ◽  
Motor Fuel ◽  
Liquefied Natural Gas ◽  
Open Pit ◽  
Promising Alternative ◽  
Technical Requirements ◽  
Production And Consumption ◽  
Dump Trucks ◽  
First Time ◽  
Further Development

The state-of-the-art of the issue of the efficiency and relevance of the use of liquefied natural gas (LNG) as a motor fuel in the operation of dump trucks is considered. An analysis of the benefits of using LNG as a motor fuel is given. It is noted that, LNG seems to be the most promising alternative to oil types of motor fuel in the segment of open-pit truck haulage. It is affirmed that in Russia, in Kuzbass, the group of companies successfully implemented for the first time an integrated project for the production of LNG and its consumption in relation to BelAZ dump trucks. Data on the relevance and the need to develop technical requirements for on-board cryogenic fuel systems of mine dump trucks are given. Data on the developed groups of technical requirements for on-board cryogenic fuel systems of BelAZ dump trucks are given. It is said that the developed technical requirements made it possible to solve a number of tasks related to the development of circuit and design solutions for equipping BelAZ dump trucks with cryogenic systems. It is argued that the developed technical requirements will contribute to the further development of domestic projects for the production and consumption of liquefied natural gas.

From diversity to inclusion: Woodside Energy's inclusion and diversity journey

2020 ◽  
Vol 60 (2) ◽  
pp. 473
Author(s):  
Ruth Lyall
Keyword(s):  
Natural Gas ◽  
Oil And Gas ◽  
Critical Role ◽  
Liquefied Natural Gas ◽  
Indigenous Australian ◽  
Inclusion And Diversity ◽  
The Way

Woodside is a leading natural gas producer in Australia, operating 6% of the global supply of liquefied natural gas. Woodside has been on an accelerated inclusion and diversity journey since 2015, with female and Indigenous Australian participation growing each year, and recognition through the Australian Workplace Equality Index as the oil and gas sector’s most LGBTI+-inclusive company in 2019.This paper sets out experiences and learnings from Woodside’s journey so far, including: the way Woodside uses measurable objectives to set expectations and increase accountability; why everyday people decisions matter; the critical role of inclusive, employee-driven networks to support under-represented groups, and also engage the broader workforce.

Global FEM Strength and Fatigue Analysis of Large LNG Vessel

2015 ◽  
Author(s):  
Jia Wang ◽  
Yan Jin ◽  
Ren Yang ◽  
Jin Liu
Keyword(s):  
Natural Gas ◽  
Dynamic Loading ◽  
High Reliability ◽  
Wave Spectrum ◽  
Load Condition ◽  
Fatigue Analysis ◽  
Liquefied Natural Gas ◽  
High Price ◽  
Strength Analysis ◽  
Load Conditions

Due to the dangers of liquefied natural gas and the high price of a liquefied natural gas (LNG) vessel, there are high reliability and safety requirements with the structure design of large LNG vessels. Taking a large LNG Vessel designed by Hudong-Zhonghua shipbuilding group as a research object, global finite element model (FEM) strength and fatigue analysis was carried out by DLA/SFA software. Five typical load conditions, including fully loaded, ballast, one tank empty, two adjacent tanks empty and three adjacent tanks empty conditions, were considered in the global strength analysis (Dynamic Loading Approach, simplified as DLA), following the Guide for Safehull-dynamic Loading Approach for Vessels (DLA Guide). For the fatigue analysis spectral-based fatigue analysis, simplified as SFA, two typical operational load conditions, including homogeneous load condition at summer draught departure and ballast load condition arrival, were considered to achieve at least 40 years fatigue life requirement with north Atlantic wave spectrum, following Guidance Notes on Spectral-based Fatigue Analysis for Vessels (SFA Guide). Some special design details were taken to solve the local stress concentration yielding and fatigue problems. Some analysis methods and design experiences are discussed and proposed. The analysis procedure and solutions of global FEM strength and fatigue analysis in this paper for a large LNG ship can be a reference to analysis for other large vessels.

Gas find will test Mauritania president's two-term vow

2017 ◽  
Keyword(s):  
Power Generation ◽  
Natural Gas ◽  
Iron Ore ◽  
Electricity Demand ◽  
Liquefied Natural Gas ◽  
Small Scale ◽  
Content Type ◽  
International Scale ◽  
Fiscal Revenue ◽  
First Time

Significance The 33,000 square kilometres of acreage includes the Tortue field, which is estimated to contain more than 15 trillion cubic feet (tcf) of gas. The deposit offers both countries the chance to become substantial offshore hydrocarbons exporters for the first time. Impacts The project will transform Mauritania from a small-scale hydrocarbons producer into an exporter on international scale. Liquefied natural gas (LNG) will diversify Mauritania's export and fiscal revenue base -- currently reliant on iron ore, gold and fish. Exports will be the priority, but electricity demand is rising in Mauritania and Senegal; some gas may be used to fuel power generation.

Marine Ecological Assessment for LNG Terminal at Port Qasim

2015 ◽  
Vol 1 (2) ◽  
Author(s):  
Dr. Shahid Amjad ◽  
Moinuddin Ali Khan
Keyword(s):  
Natural Gas ◽  
Liquefied Natural Gas ◽  
Dredged Material ◽  
Shore Protection ◽  
Gas Network ◽  
Transmission Pipeline ◽  
Approach Channel ◽  
Indus Delta ◽  
Set Up ◽  
First Time

Multinational companies intend to develop a Liquefied Natural Gas (LNG) terminal with floating storage and regasification arrangement (FSRA) in the jurisdiction of Port Qasim. Approximately 500 MMSCFD or 3.5 million tons per annum of LNG would be transferred through a mooring arrangement, which would require marine works/structures such as a berth for docking and mooring of LNG Carriers and Floating Ship Regasification Arrangement (FSRA) i.e., unloading, storage and vapor recovery and return unit and pipelines to the delivery point for transport to off-takers. The FSRA will deliver the re-gasified liquefied natural gas (RLNG) via jetty and onshore associated facilities to the gas network operated by the in-country transmission pipeline providers SSGCL and SNGPL. The approach channel of Port Qasim is associated with Gharo Phitti Creek System consists of three creeks: Gharo Creek, Kadiro Creek and Phitti Creek has tidal creeks and are with associated mangrove and mudflats ecosystems that are linked with a network of creeks in the Indus Delta. Dredging will be required to create the berthing and the turning basin of diameter 400 to 700 m with a depth of -13.5 m below chart datum (CD). Approximate dredged material would be upto 5.5 Million cubic meters. The dredged material will be utilized for the reclamation and to construct shore protection structure. Land Area of 75-100 acres with water front of 1000 m has been allocated in the PQA for this project. This would be the first time that LNG terminals are being set up in PQA.

Experimental and Numerical of Sloshing Effect on Heave and Pitch Motions of FLNG Vessel

2014 ◽  
Vol 664 ◽  
pp. 153-157 ◽  
Author(s):  
Luhut Tumpal Parulian Sinaga ◽  
I.K.A.P Utama ◽  
A. Sulisetyono
Keyword(s):  
Natural Gas ◽  
General Equation ◽  
Wave Amplitude ◽  
Numerical Models ◽  
Critical Role ◽  
Liquefied Natural Gas ◽  
Ship Motion ◽  
Fluid Level ◽  
Strongly Nonlinear ◽  
Impulsive Response

Recently the demand of sloshing analysis is rising for building FLNG (Floating Liquefied Natural Gas) vessel. This study considers the experimental and numerical observations on strongly nonlinear sloshing flows in ship motion. The FLNG (Floating Liquefied Natural Gas) vessel was considered to be rigid body supported by non-permanent pole with distributed spring damper. Based on the general equation of the ship motion in waves, and various wave amplitude, various heading, wave period and critical fluid level on the cargo tank period governing equation induced by sloshing were derived. Several physical issues are introduced in the analysis of sloshing flows, and the corresponding numerical models are described. To study the sloshing effects on ship motion, a ship motion program based on impulsive response function (IRF) is coupled with the developed numerical models for sloshing analysis. The results show that the nonlinearity of sloshing-induced forces and moments plays a critical role in the coupling effects.

Sign in / Sign up

Export Citation Format

Share Document