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[ pdf ] Cathodic Protection

Cathodic Protection Download
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Last download on: Mon Apr 09, 2018 07:52:18 PM
Short Desciption:
UFC 3-570-02A. 01 March 2005. UNIFIED FACILITIES CRITERIA (UFC). CATHODIC PROTECTION. APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED

Summary:
i LIST OF FIGURES Figure Page 1-1 Corrosion of a pipeline due to localized anode and cathode sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2. Galvanic and impressed current systems for cathodic protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 2-1. Design sequence for cathodic protection systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 A-1. Wenner four-pin method for measuring resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 A-2. Soil box for soil resistivity measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 B-1. Current requirement test on pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 C-1. Galvanic anode cathodic protection for hydrant refueling system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 C-2. Galvanic anode cathodic protection for underground steel storage tank . . . . . . . . . . . . . . . . . . . . . . . . . C-4 C-5. Layout of gas piping in residential district . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5 D-l. Cathodic protection system for gas main . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-l D-2. Impressed current cathodic protection for heating conduit system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4 D-3. Cathodic protection for black iron hot water storage tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-7 D-4. Fringe factor for stub anodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-9 D-5. Dimensions for an elevated steel water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-10 D-6. Cathodic protection for tanks using rigid-mounted button-type anodes and platinized titanium wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-12 D-7. Segmented elevated tank for area calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-13 D-8. Anode spacing for elevated steel water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-15 D-9. Anode suspension arrangement for elevated steel water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-17 D-10. Equivalent diameter factor for anodes in a circule in water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-18 ____________ This manual supersedes Sections VII, VIII, and IX of TM 5-811-4, 1 August 1962. TM 5-811-7 LIST OF FIGURES (CONTíd) Paragraph Page D-l 1. Elevated steel water tank showing rectifier and anode arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-24 D-12. Hand hole and anode suspension detail for elevated water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-25 D-13. Riser anode suspension detail for elevated water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-25 E-1. Ceramic anode specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-l F-1. Structure-to-soil potential versus distance from foreign structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1 F-2. Cathodic interference testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2 LIST OF TABLES Table Page 2-1. Corrosivity of soils on steel based on soil resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-2. Typical current density requirements for cathodic protection of uncoated steel . . . . . . . . . . . . . . . . . . . 2-2 2-3. Weights and dimensions of selected high-potential magnesium-alloy anodes . . . . . . . . . . . . . . . . . . . . . 2-4 2-4. Weights and dimensions of selected circular high-silicon chromium-bearing cast iron anodes . . . . . . . 2-6 2-5. Shape functions (K) for impressed current cathodic protection anodes where L is the effective anode length and d is the anode/backfill diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 2-6 Anode paralleling factors (P) for various numbers of anodes (N) installed in parallel . . . . . . . . . . . . . . 2-6 C-1 Outside area of liquid fuel pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2 C-2. Requirements for anode spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5 C-3. Dimensions for finding outside area of pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6 C-4. Galvanic anode size factor If) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7 C-5. Structure potential factor (y) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7 C-6. Dimensions for finding anode division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8 D-1. Dimensions for finding steam conduit area: heat distribution system . . . . . . . . . . . . . . . . . . . . . . . . . . . D-5 D-2. Dimensions for finding condensate return conduit area: heat distribution system . . . . . . . . . . . . . . . . . . D-5 D-3. Conduit area: heat distribution system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-6 D-4. Anode division: heat distribution system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-7 D-5. Technical data: commonly used HSCBCI anodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
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