Alternative Storage Conceptions
Comparison of alternative Storage Methods
Storage product: Gasoline (RVP 600 mbar)
Temperature: Ta = Ts = 10 °C, ΔTa = 8 °C
Wind Speed: 3 m/s
Tank diameter: 44 m
Quantity of Emission for 12 filling cycles per year / for 0 filling cycles per year.
Sources of emissions: | |||||||||||||
Case | Tank | Seal | Outline / Subject |
annual emissions [kg/a] | rim space |
guide pole |
roof legs |
other installations | tank wall wetting | efficiency of tank (%) | |||
1 | Fixed roof tank without floating roof P/V-valve only | Comparison tank (bBase case) |
294.583 26.917 |
0,0 | |||||||||
2 | Floating roof tank | double seal, guide pole seal, roof leg seals | Existing Plants |
1266 1196 |
895 | 122 | 122 | 58 | 70 0 |
99,6 95,6 |
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3 | Floating roof tank | threefold-seal, guide pole seal + HELICOAT®, roof leg seals | Existing Plants |
435 365 |
169 | 17 | 122 | 58 | 70 0 |
99,9 98,6 |
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4 | Floating roof tank with alu dome | double-seal, guide pole seal, without roof leg seals | Existing Plants |
388 318 |
116 | 17 | 150 | 35 | 70 0 |
99,9 98,8 |
|||
5 | Fixed roof tank with steel floating roof ventilated freely | double-seal, guide pole seal, roof leg fix | Existing Plants |
238 168 |
116 | 17 | 0 | 35 | 70 0 |
99,9 99,4 |
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6 | Fixed Roof Tank with steel floating roof + P/V-Valve |
double seal, guide pole seal, roof leg fixed | Existing Plants |
≈238 ≈168 |
Emission equivalent Case 5, but concentrations within the gas space in the critical region (at times above UEG) => safety fittings neccessary. The effect of the P / V - valve is compensated by increased heating up of the product in unventilated tanks. |
99,9 99,4 |
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7 | Fixed roof tank + vapor balancing + vapor treatment |
New Plants |
High investment and operating costs / high total emissions (CO2, NOx, methane ...), in consideration of direct emissions and emissions by use of electricity power and other utilities / Risk of failure of vapor treatment plant. |
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8 | Floating roof + vapor suck off from seal spaces + vapor treatment |
threefold seals, guide pole seal + HELICOAT®,roof leg seals | New Plants |
Small compact single-stage adsorption sufficient. Low investment and operating costs |
© Ingenieurbüro Imhof GmbH • Otto-Hahn-Str. 12 • 63165 Mühlheim/Germany • Tel. +49 6108 / 60 999 • info@imhof-tanktechnik.de