Basic calculation for cathodic protection system for internal tank
Data:
Atmospheric
Storage Tank:
- length : 11 m
- Diameter (D) : 38 m
- high of water level (L) : 9 m
Current
Density (CD) :
55 mA/m2
Consumption
Rate of Aluminum Anode : 3.5 kg/Amp
Year
life time design :
0.2 tahun
Utility
Factor :
0.8
Calculation:
1
Surface
Area (SA)
- SA bottom =
p x D2 =
3.14 x 382 = 1134.1 m2
4 4
- SA wall = p x D x L = 3.14 x 38 x 9 = 1074.4 m2
4 4
- SA wall = p x D x L = 3.14 x 38 x 9 = 1074.4 m2
Total Surface Area = 2208.5 m2
2
Current Requirement
(Ip)
Ip = SA x CD
=
2208.5 m2 x 55 mA/m2
= 121467.5 mA = 121.5 Amp
= 121467.5 mA = 121.5 Amp
3 Weight
of Anode (W)
WAl =
Ip x Y x 3.5 kg/Amp Year
U
= 121.5 Amp x 0.2 years x 3.5 kg/Amp Year
0.8
U
= 121.5 Amp x 0.2 years x 3.5 kg/Amp Year
0.8
=
106.3 kgs
4 Number
of Aluminium Anode (N)
Proposed
Aluminium Anode type 120 ADFB - Net weight = 12 kg/ea
NAl
= WAl : 12 kg
= 106.3 kgs : 12 kg
= 8.86 pcs » 9 pcs
Total = 9 pcs
Aluminium Anode type 120 ADFB
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