PLATTLINETM ZINC RIBBON ANODES

A.C. Mitigation Installation - Empire State PipelineAn ANR Pipeline Company Project

It is common for a pipeline and an existing powerline touse the same right of way area to minimize land use, reducedamage to the environment and to help reduce installed costs.Alternating Current, power arching and stray currents maydevelop due to the proximity of the pipeline to the power line.This, in turn, is hazardous to personnel constructing, operatingand maintaining both systems, as well as possible minor tosevere damage to the pipeline itself.

ANR Pipeline Company, located in Detroit, Michigan, hassuccessfully designed the use of Plattline" Zinc RibbonAnodes for Mitigation of Alternative Currents between a 24"pipeline and two 345kv transmission lines operated by theNew York Power Authority. The above two systems areapproximately 80 feet apart throughout the 154 miles fromNiagara to Syracuse, New York. Studies performed for theEmpire State Pipeline determined that the transmission linescan attain maximum values on the order of 200 to 250 volts inat least three locations if no mitigative measures were present.With the following mitigative designs, the maximum predictedmagnetically induced pipeline potential is reduced to 70 voltsand less than 44 volts along approximately 98% of the rightof way. The touch and step voltages do not exceed 15 voltsat any location during worst case steady state conditions,meeting ANSIIIEEE Standard 80 safety criteria.

According to NACE Standard RP0177-83, RecommendedPractice in Mitigation of Alternating Current & LightningEffects on Metallic Structure and Corrosion ControlSystems, 4.2.1 ... 30 volts ac (RMS) open circuit or a sourcecurrent capacity of 5 mA or more, through 1500 ohms, will beconsidered to constitute an anticipated shock hazard.

Pipeline Application

A pair of Plattline Standard, Type II Zinc Ribbon Anodeswere buried 6' deep and 38" apart; one on either side ofthe pipeline. See Diagram 1. At two specific sites where therewere "hot spot" from soil resistivity testing, vertical rods wereconnected to the ribbon anodes. These 30 foot, 3/4" diametergalvanized steel rods were connected in an alternating pattern.See Diagram 2.

Diagram 13600'

100' 900'

,II 200'==1. I=--.. ~.. ....--1 - ..... ----.-1-..---'L@II.1rlf·1J·ill'I•• '-mill.-r-'~!'Jrr-»:" 200' -:

VerticalGroundRods

MitigatingWire

Diagram 2Earth Surface

72" 24" Pipeline

38"

Connection BetweenPipelineand

Mitigating Wire30" Every 900 Feet

Pair of 1/2" x 9/16Diamond

Cross SectionZinc Anode

Coil ConductorsStaggeredVertical

GraundingRods:

3/4" DiameterGalvinizedSteel Rods

Gradient Control Grid Application

The second phase of safety control was the construction of 3types of gradient control grids which reduces the touch andstep voltages that occur at main line valve stations. Thesestations are the only locations where exposed pipeline metalexists. The main grid conductor is made of cut lengths ofPlattIine Standard Type II Zinc Ribbon Anode and crimpedeither with copper rings or cad welded in place. This grid is thenburied approximately 1.5 feet from the surface with a layer ofcrushed stone (6 inches thick) over the entire grid for maximumdrainage and personnel protection. A fence is then constructedaround each grid. See Diagram 3.

Diagram 3"''<- s'''"'"__ '''..."'" \ '\

Type A Grid

Type B Grid ~\;;" \,(s s~~Type C Grid

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PLATTLINETM ZINC RIBBON ANODES

Product Data Sheet

Plattline" zinc ribbon anodes are used in a variety of applications. They are used for cathodic protectionon buried pipelines, for A.C. mitigation on pipelines, for sacrificial cathodic protection of secondarybottoms on above-ground storage tanks, for A.C. mitigation grounding mats and for other corrosionprotection applications.

Specification 0 0 0 0Chart

Product Size Super Plus Standard Small

Cross Section: 1" x 1-1/4" 5/8" x 7/8" 1/2" x 9/16" 11/32" x 13/32"InchesMillimeters 25.4 x 31.75 15.88 x 22.22 12.7 x 14.28 8.73 x 10.32

1WeightIFoot, Pounds 2.4 1.2 0.6 0.25Weight/Kg., Meters 3.570 1.785 .8925 .372

2 3Diameter of wire core 0.185 0.135 0.130 0.115InchesMillimeters 4.70 3.43 3.30 2.92

4

Standard Coil Length 100 +do 200 ~.J0 500 +~o 1000 +goFeetMeters 30.5 +~ 61 ~;l 152 +t 305 +J5

Standard Coil LD. 36 36 12 12Inches 91.44 91.44 30.5 30.5Centimeters

Steel-banded Steel- bandedPackaging random-wound random-wound Wood Reels Wood Reels

open coils open coils

I. All dimensions and weights are nominal.2. Galvanized Steel3. "Arctic" standard size has nominal core diameter of

.163 inches (4.140 mm.)

4. Longer coil lengths are available on special order.Standard size also available in reels of 1000 ft and 3600 ft.

~~

001

PlattIine I is an alloyed zinc product and is generally used in seawater or brackish water systems.It meets the chemical requirement of MIL-A-JSOOIKand ASTM B41S-95a Type I.

Plattline II is a high purity product and generally used in underground and fresh water systems.It meets the chemical requirements of ASTM B418-95a Type II.

IThe Platt Brothers & Company 2670 South Main St. P.O. Box 1030 'faterbury, CT 06721

T 800-752-8276 or 203-753-4194 Fax 203-753-9709 email plattline@snet.net www.plattbros.com

This document its contents and related information are submitted as suggestions with no warranty or other representation. Any use thereof is at the user's independent discretion. In

connection therewith. Platt Bros. & Co. shall have no liability of any kind, grants no license and assumes no responsibility, for sultability, practicability, freedom of patent or otherinfringement, or conformation to codes, standards or regulations. The foregoing may be waived or modified only in writing by an authorized officer of the Platt Bros. & Co.