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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
Vergleichstank
Comparison tank (bBase case)
294.583
26.917
0,0
2 Floating roof tank double seal, guide pole seal, roof leg seals
Fall 2
Existing Plants
1266
1196
895 122 122 58 70
0
99,6
95,6
3 Floating roof tank threefold-seal, guide pole seal + HELICOAT®, roof leg seals
Fall 3
Existing Plants
435
365
169 17 122 58 70
0
99,9
98,6
4 Floating roof tank with alu dome double-seal, guide pole seal, without roof leg seals
Fall 4
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
Fall 5
Existing Plants
238
168
116 17 0 35 70
0
99,9
99,4
6 Fixed Roof Tank with steel floating roof
+ P/V-Valve
double seal, guide pole seal, roof leg fixed
Fall 6
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
7 Fixed roof tank
+ vapor balancing
+ vapor treatment

Fall 7
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.
8 Floating roof
+ vapor suck off from seal spaces
+ vapor treatment
threefold seals, guide pole seal + HELICOAT®,roof leg seals
Fall 8
New Plants
Small compact single-stage adsorption sufficient.
Low investment and operating costs

 

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