Collect data.

Calculate surface area to be protected.\

Select anode type.

Maximum Anode Length From Connection Point

Calculate number of anodes (N) or length of bare anode wire

Calculate the total circuit resistance (RT).

Calculate the total circuit resistance (RT). cont'd - ETL-1110-9-10FR0013

Calculate the total circuit resistance (RT). cont'd - ETL-1110-9-10FR0014

Calculate the total circuit resistance (RT). cont'd - ETL-1110-9-10FR0015

Calculate required rectifier voltage and current. cont'd

References.

References. cont'd - ETL-1110-9-10FR0018

References. cont'd - ETL-1110-9-10FR0019

XAMPLES OF IMPRESSED CURRENT CATHODIC PROTECTION DESIGN

Figure 2-1A Cathodic Protection System for Fuel Oil Line With Anode Extended Perpendicular From Pipeline

Figure 2-1B Cathodic Protection System for Fuel Oil Line With Anode Bed Installed Parallel to Pipeline

Figure 2-2 Vertical Groundbed Layout Using Prepackaged Ceramic Rod Anode

Figure 2-3. Prepackaged Ceramic Rod Anode for Underground Use

Figure 2-4. Ceramic Anode Canister Prepackaged Rod

Computations. - ETL-1110-9-10FR0026

Computations. cont'd - ETL-1110-9-10FR0027

Computations. cont'd - ETL-1110-9-10FR0028

Computations. cont'd - ETL-1110-9-10FR0029

Computations. cont'd - ETL-1110-9-10FR0030

Computations. cont'd - ETL-1110-9-10FR0031

Computations. cont'd - ETL-1110-9-10FR0032

Underground Storage Tanks (USTs).

Underground Storage Tanks (USTs). cont'd

Figure 2-5 Cathodic Protection for Underground Storage Tanks and Piping

Computations. cont'd - ETL-1110-9-10FR0036

Computations. cont'd - ETL-1110-9-10FR0037

Computations. cont'd - ETL-1110-9-10FR0038

Computations. cont'd - ETL-1110-9-10FR0039

Select rectifier - ETL-1110-9-10FR0040

On-Grade Tank Bottoms.

On-Grade Tank Bottoms. cont'd

Figure 2-6 On-Grade Tank Bottoms

Typical Deep Anode Grounded Using Rod Angeles

Figure 2-7A Ceramic Rod Anode for Deep Grounded Use

Figure 2-8. Ceramic Anode Tubular Power Rod Used in Deep Bed

Figure 2-8A. Ductile Ceramic Anode Tubular Power Rod

Computations - ETL-1110-9-10FR0048

Computations cont'd - ETL-1110-9-10FR0049

Figure 2-9A Deep Anode Groundbed Resistance 25 to 50 ft.

Figure 2-9B Deep Anode Resistance 50 to 100 ft.

Figure 2-9C Deep Anode Groundbed Resistance 100 to 150 ft.

Computations cont'd - ETL-1110-9-10FR0053

Computations cont'd - ETL-1110-9-10FR0054

Computations cont'd - ETL-1110-9-10FR0055

Computations cont'd - ETL-1110-9-10FR0056

Computations cont'd - ETL-1110-9-10FR0057

Installation - ETL-1110-9-10FR0058

Figure 2-10 Pole-Mounted Rectifier

Gas Distribution System.

Design data cont'd

Figure 2-11. Deep Anode Cathodic Protection for Gas Distribution System

Computations - ETL-1110-9-10FR0063

Computations cont'd - ETL-1110-9-10FR0064

Computations cont'd - ETL-1110-9-10FR0065

Computations cont'd - ETL-1110-9-10FR0066

Computations cont'd - ETL-1110-9-10FR0067

Computations cont'd - ETL-1110-9-10FR0068

Select rectifier - ETL-1110-9-10FR0069

Figure 2-12. Typical Deep Anode Groundbed Using Tubular Anodes

Figure 2-13. Ceramic Anode Tubular Power Rod Used in Deep Anode Bed

Elevated Water Tank (Ice Is Expected).

Computations. - ETL-1110-9-10FR0073

Computations. cont'd - ETL-1110-9-10FR0074

Computations. cont'd - ETL-1110-9-10FR0075

Computations. cont'd - ETL-1110-9-10FR0076

Installation - ETL-1110-9-10FR0077

Figure 2-14. Elevated Pedestal Tank (Icing Conditions) With Hoop Ceramic Anode

Figure 2-14A A Pressure Entrance Fitting for Underwater Power and Reference call Wire Penetration in Water Stotage Tanks

Elevated Water Tank (No Icing Will Occur).

Computations. - ETL-1110-9-10FR0081

Figure 2-15. Elevated Water Tank Showing Rectifier ad Anode Arrangement

Figure 2-16. Segmented Elevated Tank for Area Calculations

Computations. cont'd - ETL-1110-9-10FR0084

Computations. cont'd - ETL-1110-9-10FR0085

Computations. cont'd - ETL-1110-9-10FR0086

Computations. cont'd - ETL-1110-9-10FR0087

Figure 2-17 Equivalent Diameter Factor for Anode in a Circle in a Water Tank

Figure 2-18 Fringe Factor for Stub Anode

Computations. cont'd - ETL-1110-9-10FR0090

Figure 2-19 Anode Spacing for Elevated Steel Water Tanks

Figure 2-20 Anode Suspencion Arrangement for Elevated Steel Water Tank

Computations cont'd - ETL-1110-9-10FR0093

Computations cont'd - ETL-1110-9-10FR0094

Computations cont'd - ETL-1110-9-10FR0095

Computations cont'd - ETL-1110-9-10FR0096

Computations cont'd - ETL-1110-9-10FR0097

Computations cont'd - ETL-1110-9-10FR0098

Computations cont'd - ETL-1110-9-10FR0099

Computations cont'd - ETL-1110-9-10FR0100

Computations cont'd - ETL-1110-9-10FR0101

Computations cont'd - ETL-1110-9-10FR0102

Select rectifier - ETL-1110-9-10FR0103

Installation details

Figure 2-21 Water Tank Hand Hole Assembly for Roof-Supported Anodes and Support Bracket for Submerged Hoop Anodes

On-Grade Water Storage Reservoir (Ice Is Expected).

Figure 2-22 Submerged Cathodic Protection System for Ground-Level Water Storage Reservoir

Computations - ETL-1110-9-10FR0108

Computations cont'd - ETL-1110-9-10FR0109

Computations cont'd - ETL-1110-9-10FR0110

Computations cont'd - ETL-1110-9-10FR0111

Select rectifier

Loop anode guidances

Figure 2-23 Details of Wire-type Anode System Designed To Withstand Ioning Conditions Withi Tank

Horizontal Anodes. (Underground Applications)

Figure 2-24 Horizontal Prepackaged Ceramic Rod Anode Groundbed

Horizontal Anodes. (Underground Applications) cont'd

Backfilling Packaged Anodes With Coke Breeze.

SECTION 3 TABLES

Table 3--2. Typical Surface Area Per Linear Foot of Common Size Pipe

Table 3-3. Dimensions and ratings of ceramic anodes.

Table 3-3. (Cont*d)

Table 3--3 (Cont*d). Fresh and Seawater Usage

Tubular Anodes (Bare)

Anode Life Versus Maximum Current Density (ampere/sq ft)

Table 3-5. Anode paralleling factors (P) for various numbers of anodes (N) installed in parallel

Table 3--6. Resistance and other parameters for stranded copper conductors

Table 3--7. suggested number of anode rings for various size tanks

Table 3-9. Adjusting factors for parallel anodes.

SECTION 4 IDENTIFICATION OF VARIABLES

SECTION 4 IDENTIFICATION OF VARIABLES cont'd - ETL-1110-9-10FR0131

SECTION 4 IDENTIFICATION OF VARIABLES cont'd - ETL-1110-9-10FR0132

ETL 1110-9-10(FR)