ASTM G218-19
(Guide)Standard Guide for External Corrosion Protection of Ductile Iron Pipe Utilizing Polyethylene Encasement Supplemented by Cathodic Protection
Standard Guide for External Corrosion Protection of Ductile Iron Pipe Utilizing Polyethylene Encasement Supplemented by Cathodic Protection
SIGNIFICANCE AND USE
4.1 This guide provides basic information on the application of cathodic protection to polyethylene encased ductile iron pipe for engineers, owners, water companies, corrosion consultants, ductile iron (DI) pipe manufacturers and others who have an interest in providing underground corrosion protection to ductile iron pipe.
4.2 There are many publications, standards, recommended practices, and specifications for the application of coatings and cathodic protection to steel pipe. However, the metallurgy, chemistry, physical properties, surface composition and texture, coating requirements and electrical continuity of standard production ductile iron pipe are significantly different than those of steel pipe, and coating and cathodic protection specifications written specifically for steel pipe may not be directly applicable to ductile iron pipe. The latest revision of a commonly accepted cathodic protection specification (NACE SP0169) states the following in the forward: “This standard does not include corrosion control methods based on injection of chemicals into the environment, on the use of electrically conductive coatings, or on the use of non-adhered polyethylene encasement (refer to NACE Publication 10A292).” It is the purpose of this guide to summarize publications, case histories, and studies which are available regarding cathodic protection installations of polyethylene encased ductile iron pipe to give the reader guidance on this unique method of protection.
4.3 This guide may be utilized with galvanic or impressed current cathodic protection.
4.4 This guide is written specifically for ductile iron pipe and does not apply to any other type of piping material. It may also be used for ductile iron fittings, valves, and appurtenances specific to ductile iron piping systems.
4.5 This guide references requirements for vendor provided information which should be requested and reviewed by the user.
SCOPE
1.1 This guide will discuss standard practices which have been successfully utilized in the field for over 35 years to provide external corrosion protection of polyethylene encased ductile iron pipe supplemented with cathodic protection (CP). This guide may also be used for ductile iron fittings, valves, and other appurtenances specific to ductile iron pipe systems. Case histories and publications reporting on the use of cathodic protection to supplement polyethylene encasement are included as an Appendix in this guide.
1.2 Other external corrosion control methods which have been used for ductile iron pipe include, but are not limited to: cathodic protection, metallic zinc coatings, bonded dielectric coatings, dielectric coatings with cathodic protection, and trench improvement. Detailed information on these methods of protection are available from other sources and are beyond the scope of this guide.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G218 − 19
Standard Guide for
External Corrosion Protection of Ductile Iron Pipe Utilizing
Polyethylene Encasement Supplemented by Cathodic
1
Protection
This standard is issued under the fixed designation G218; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2.1 The most recent version of the following documents
1.1 This guide will discuss standard practices which have
should be consulted as references by those using this guide:
been successfully utilized in the field for over 35 years to
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provide external corrosion protection of polyethylene encased 2.2 ASTM Standards:
ductile iron pipe supplemented with cathodic protection (CP).
A674 Practice for Polyethylene Encasement for Ductile Iron
This guide may also be used for ductile iron fittings, valves, Pipe for Water or Other Liquids
and other appurtenances specific to ductile iron pipe systems. A746 Specification for Ductile Iron Gravity Sewer Pipe
D149 Test Method for Dielectric Breakdown Voltage and
Casehistoriesandpublicationsreportingontheuseofcathodic
DielectricStrengthofSolidElectricalInsulatingMaterials
protection to supplement polyethylene encasement are in-
at Commercial Power Frequencies
cluded as an Appendix in this guide.
D882 Test Method for Tensile Properties of Thin Plastic
1.2 Other external corrosion control methods which have
Sheeting
been used for ductile iron pipe include, but are not limited to:
D1709 Test Methods for Impact Resistance of Plastic Film
cathodic protection, metallic zinc coatings, bonded dielectric
by the Free-Falling Dart Method
coatings, dielectric coatings with cathodic protection, and
D1922 Test Method for Propagation Tear Resistance of
trench improvement. Detailed information on these methods of
Plastic Film and Thin Sheeting by Pendulum Method
protection are available from other sources and are beyond the
D4976 Specification for Polyethylene Plastics Molding and
scope of this guide.
Extrusion Materials
G51 Test Method for Measuring pH of Soil for Use in
1.3 The values stated in inch-pound units are to be regarded
Corrosion Testing
as standard. The values given in parentheses are mathematical
G57 Test Method for Field Measurement of Soil Resistivity
conversions to SI units that are provided for information only
Using the Wenner Four-Electrode Method
and are not considered standard.
G97 Test Method for Laboratory Evaluation of Magnesium
1.4 This standard does not purport to address all of the
SacrificialAnode Test Specimens for UndergroundAppli-
safety concerns, if any, associated with its use. It is the
cations
responsibility of the user of this standard to establish appro-
G187 Test Method for Measurement of Soil Resistivity
priate safety, health, and environmental practices and deter- Using the Two-Electrode Soil Box Method
mine the applicability of regulatory limitations prior to use. G193 Terminology and Acronyms Relating to Corrosion
G200 TestMethodforMeasurementofOxidation-Reduction
1.5 This international standard was developed in accor-
Potential (ORP) of Soil
dance with internationally recognized principles on standard-
G215 Guide for Electrode Potential Measurement
ization established in the Decision on Principles for the
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2.3 ANSI/AWWA Standards:
Development of International Standards, Guides and Recom-
ANSI/AWWA C105/A21.5 Polyethylene Encasement for
mendations issued by the World Trade Organization Technical
Ductile-Iron Pipe Systems
Barriers to Trade (TBT) Committee.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This guide is under the jurisdiction ofASTM Committee G01 on Corrosion of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Metals and is the direct responsibility of Subcommittee G01.10 on Corrosion in Standards volume information, refer to the standard’s Document Summary page on
Soils. the ASTM website.
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Current edition approved Oct. 1, 2019. Published October 2019. DOI: 10.1520/ Available fromAmerican Water WorksAssociation (AWWA), 6666 W. Quincy
G0218-19. Ave., Denver, CO 80235, http://www.awwa.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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G218 − 19
ANSI/AWWAC110/A21.10 Ductile-Iron and Gray-Iron Fit- polyethylene raw material with additives designed to control
tings generalized corrosion and microbiolo
...
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