SECTION 02655

CATHODIC PROTECTION - PASSIVE

PART	GENERAL

SECTION INCLUDES

Anodes and attachment to buried metallic components [and buried tanks].

RELATED SECTIONS

Section 02222 - Excavating.

Section 02223 - Backfilling.

Section 02225 - Trenching.

Section [_____-__________]: Metal pipe requiring cathodic protection.

Section [_____-__________]: Metal tanks requiring cathodic protection.

Section [_____-__________]: Buried metal structures requiring cathodic protection.

Section [_____-__________]: Metal conduit requiring cathodic protection.

Section 16111 - Conduit.

UNIT PRICE - MEASUREMENT AND PAYMENT

Anodes:

Basis of Measurement: By the unit.

Basis of Payment: Includes placement of anode, attachment to components, wiring to test station, minor backfilling associated with this work.

Test Stations:

Basis of Measurement: By the unit.

Basis of Payment: Includes placement of test station, attachment of components, wiring to anodes, minor backfilling associated with this work.

REFERENCES

ASTM B418 - Cast and Wrought Galvanic Zinc Anodes for Use in Saline Electrolytes.

NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

NACE RP-01 (National Association of Corrosion Engineers) Mitigation of Alternating Current and Lightning Effects on Metallic Structures and Corrosion Control Systems.

PERFORMANCE REQUIREMENTS

Conform to NACE RP-01 standard.

Iron and Steel Components:

Negative voltage of [0.85] [____] volts measured between component and saturated reference electrode contacting the earth near component.

Negative voltage shift of [300] [____] millivolts measured between component and saturated reference electrode contacting the earth near component.

Polarization voltage shift of [100] [____] millivolts measured between component and saturated reference electrode contacting the earth near component.

Aluminum Components:

Negative voltage of [1.2] [____] volts measured between component and saturated reference electrode contacting the earth near component.

Negative voltage shift of [150] [____] millivolts measured between component and saturated reference electrode contacting the earth near component.

Polarization voltage shift of [100] [____] millivolts measured between component and saturated reference electrode contacting the earth near component.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate wiring diagrams.

Product Data: Provide data for anodes and test panels.

Manufacturer's Installation Instructions: Include procedures applicable to protecting differing metals.

PROJECT RECORD DOCUMENTS

Submit under provisions of Section [01700.] [________.]

Accurately record actual locations of anodes and test panels.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700.] [________.]

Operation Data: Include periodic test procedures.

QUALIFICATIONS

Installer: Company specializing in performing the work of this Section [with minimum [three] [__________] years [documented] experience] [approved by manufacturer].

Design system under direct supervision of Corrosion Engineer experienced in design of this type of work and certified by [National Association of Corrosion Engineers] [________].

[Submit proof of designer certification.]

FIELD MEASUREMENTS

Verify that field measurements are as [indicated [on shop drawings]] [instructed by the manufacturer].

COORDINATION

Coordinate work under provisions of Section [01039.] [________.]

Coordinate the Work with placement of buried site metallic components requiring protection.

PART	PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600.] [________.]

MATERIALS

Magnesium Anode: Core of [galvanized steel] [________], [tape] [rod] [________], bare weight of [9] [17] [32] lbs ([____] gm), coating alloy content conforming to the following:

Aluminum: [0.05] [____] percent, maximum.

Manganese: [0.5 to 1.3] [____] percent, maximum.

Zinc: [0] [____] percent, maximum.

Silicon: [0] [____] percent, maximum.

Copper: [0.02] [____] percent, maximum.

Nickel: [0.001] [____] percent, maximum.

Iron: [0.03] [____] percent, maximum.

Other Impurities: [0.3] [____] percent, maximum.

Zinc Anode: ASTM B418 Type [I] [II], [cast] [wrought] galvanic zinc, [tape] [rod] [________], bare weight of [5] [30] lbs ([____] gm).

Aluminum Anode: [tape] [rod] [________], bare weight of [____] lbs ([____] gm), coating alloy content conforming to the following:

Indium: [0.02] [____] percent, maximum.

Zinc: [4.5] [____] percent, maximum.

Anode Lead Wire: Solid copper conductor, [12] [____] AWG, Type [TW] [THW] [RHH] [____] insulation.

Field Wiring: Stranded copper conductor, [____] AWG Type [TW] [RHE-USE] [____] insulation.

Conduit: Rigid [galvanized steel] [non-metallic]; as specified in Section [16111.] [________.]

ANODE BACKFILL

Backfill: Blended granular mixture, 100 percent passing a 10 (150 micro m) mesh screen; composed of the following:

Hydrated Gypsum: 75 percent.

Bentonite Clay: 20 percent.

Sodium Sulphate: 5 percent.

ACCESSORIES

Concrete Box: Precast concrete [, of sulphate resisting Portland cement concrete]; [dimensions as indicated] [____x____x____] inches ([____x____x____] mm)]; [concrete] [cast iron] cover with identification markings to include "Cathodic Protection Test" in letters not less than [1.5] [____] inches ([38] [____] mm) high.

Enclosure: [NEMA 250 Type [3] [3R] [4] [4X].] [________.]

Terminal Board: One piece with screw terminals rated [15] [____] amperes.

Shunt: [0.01] [0.1] [____] ohm, [6] [____] ampere, accuracy of plus or minus [1] [____] percent.

Current Control Resistor: [________] ohm, [________] watt, adjustable slide wire type.

PART	EXECUTION

EXAMINATION

Verify buried pipe systems are completed and tested under provisions of Section [01039.] [________.]

INSTALLATION

Fasten anode lead wire to anode [tape] [rod] [____] by silver brazing. Provide wire length of [10] [20] [____] feet ([3] [6] [____] m). Insulate connection to [600] [____] volts, overlapping lead wire insulation by [1/2 [____] inch ([12] [____] mm) minimum.

Pack anode and backfill in [cloth] [paper] [________] bag; center anode and firmly pack backfill with mechanical vibrator. Use sufficient backfill material to obtain the following packaged weight:

Anode Weight in lbs	Packaged Weight in lbs

9	23

17	42

32	70

[____]	[____]

Provide bonding to ensure protected components are electrically continuous.

Connect system to [[ferrous] [copper] pipe] [, metal tanks] [and] [________] by [exothermic weld] [mechanical] methods.

Locate test stations as follows:

At each location of protected pipe crossing another metallic pipe.

At each end of casing under [roadway.] [________.]

At each inaccessible insulating pipe joint.

[Where indicated.]

At intervals not to exceed [1,000] [________] feet ([330] [____] m).

Install test stations on pipe stanchion [____] inches ([____] mm) above grade.

Restore corrosion protective coatings and wraps damaged during installation.

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400.] [________.]

Conform to NACE RP-01.

END OF SECTION