5 Jan 91
The current requirements for stub anodes
512 sq ft x 2.5 mA/sq ft = 1280 mA or 1.3 amp
The total current requirement for the bowl
is 19.0 amp (from step 3).
amp - 1.3 amp = 17.7 amp
Select number of stub anodes (NS).
In step 11, five stub anodes were assumed.
the number required from equation 1-2:
1.3 amp (Current requirement from
1 amp/anode current rating per anode
from table 2-4
for 4-ft long by
0.138-in. diameter ceramic rods.
1.3; use 2 - 4 ft anode rods
The five anodes selected to provide proper
coverage over the bottom are more than sufficient
for the desired anode life.
12) Calculate the stub anodes-to-water resistance (RN).
Find the stub anode resistance from equation 1-13:
0.0052 p 1n [D/(2 AR DE)]