DEVELOPMENT OF SLOSHING DAMPING DEVICES FOR OIL STORAGE TANKS USING FLOATING NETS

Floating roofs are widely used to prevent evaporation of content in large cylindrical aboveground oil storage tanks. The 2003 Hokkaido Earthquake caused severe damages to the floating roofs due to sloshing. These accidents became a cause to establish structural integrity of the floating roof tanks in sloshing. However, many designers do not have a solution for the sloshing of floating roof tanks except for three-dimensional FEA computer codes. The three-dimensional FEA requires a long computational time and expenses. The sloshing of floating roof tanks is a coupling vibration problem with fluid and structure. The simplified and convenient method has been desired for this solution. This paper presents a simplified development method of a FEA code in the axisymmetric linear problem. It is performed to modify an existing structural analysis code. The fluid behavior is formulated in terms of displacement as the Lagrangian approach.

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Deep and Very Deep Oil-Storage Tanks

10.4043/1945-ms ◽

1974 ◽

Author(s):

Lucien Pliskin

Keyword(s):

Storage Tanks ◽

Oil Storage

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Lowering uncertainty in crude oil measurement by selecting optimized envelope color of a pipeline

Thermal Science ◽

10.2298/tsci100601079f ◽

2011 ◽

Vol 15 (1) ◽

pp. 91-104 ◽

Cited By ~ 1

Author(s):

Mahmood Farzaneh-Gord ◽

Alireza Rasekh ◽

Morteza Saadat ◽

Amin Nabati

Keyword(s):

Solar Radiation ◽

Crude Oil ◽

Temperature Rise ◽

Volume Measurement ◽

Storage Tanks ◽

Exterior Surface ◽

Oil Storage ◽

Gravity Effects ◽

Oil Export ◽

Measured Volume

Lowering uncertainty in crude oil volume measurement has been widely considered as one of main purposes in an oil export terminal. It is found that crude oil temperature at metering station has big effects on measured volume and may cause big uncertainty at the metering point. As crude oil flows through an aboveground pipeline, pick up the solar radiation and heat up. This causes the oil temperature at the metering point to rise and higher uncertainty to be created. The amount of temperature rise is depended on exterior surface paint color. In the Kharg Island, there is about 3 km distance between the oil storage tanks and the metering point. The oil flows through the pipeline due to gravity effects as storage tanks are located 60m higher than the metering point. In this study, an analytical model has been conducted for predicting oil temperature at the pipeline exit (the metering point) based on climate and geographical conditions of the Kharg Island. The temperature at the metering point has been calculated and the effects of envelope color have been investigated. Further, the uncertainty in the measurement system due to temperature rise has been studied.

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Activated Flooded Jets and Immiscible Layer Technology Help to Remove and Prevent the Formation of Bottom Sediments in the Oil Storage Tanks

10.5772/intechopen.95230 ◽

2021 ◽

Author(s):

Georgii V. Nesyn

Keyword(s):

Crude Oil ◽

Bottom Sediments ◽

External Heat ◽

Storage Tanks ◽

High Molecular Weight Polymer ◽

Molecular Weight Polymer ◽

Oil Storage ◽

Screw Propeller ◽

Fit For Purpose ◽

Tank Bottom

Two flooded jet methods of tank bottom sediments caving based on either screw propeller generation or nozzle jets generated with entering crude head oppose each other. The comparison is not advantageous for the first one. Exceptionally if crude oil contains some concentration of high molecular weight polymer which can perform Drag Reduction. In this case, the jet range increases by many times, thus, upgrading the capability of caving system. Preventing the sedimentation of crude oil heavy components may be put into practice with Immiscible Layer Technology. Before filling the tank with crude oil, some quantity of heavy liquid, that is immiscible with all the components of crude oil, is poured into the tank. The most suitable/fit for purpose and available liquid is glycerin. Neither paraffin and resins, nor asphaltenes can penetrate through the glycerin layer to settle down at the tank bottom because of its density, which is equal to 1.26 g/cm3. Instead, sediments are concentrated at/on the glycerin surface and when it is heated in external heat exchanger all the sediments ought to move upwards with the convection streams. Thus, no deteriorate sediment is formed in the tank bottom.

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