ASTM G218 is a technical guide for external corrosion protection of ductile iron pipe using polyethylene encasement supplemented by cathodic protection. It addresses a combined protection approach for buried pipe systems where long-term durability and corrosion control are important. This standard helps users understand a recognized method for protecting ductile iron pipe in service, supporting more consistent engineering decisions, procurement, and field application of corrosion mitigation measures.

Overview of ASTM G218

ASTM G218 provides guidance for protecting ductile iron pipe from external corrosion by combining polyethylene encasement with cathodic protection. The official standard title indicates a focused technical document intended for corrosion control planning and evaluation rather than general pipe specification. It is useful where buried ductile iron pipe may need layered protection to improve reliability and reduce the risk of external deterioration. For engineers, inspectors, and purchasers, ASTM G218 offers a defined reference for selecting and applying this protection strategy.

Common use cases of ASTM G218

This standard is commonly used when ductile iron pipe is installed in environments where external corrosion protection is needed and polyethylene encasement alone may be supplemented by cathodic protection. It is relevant to buried piping projects, utility infrastructure work, and corrosion control programs that require coordinated design and installation practices. ASTM G218 may also support project specifications, submittals, and acceptance reviews when a documented protection method is needed for ductile iron pipe systems.

Benefits of using ASTM G218

Using ASTM G218 can help bring consistency to corrosion protection decisions for ductile iron pipe and support clearer communication between specifiers, suppliers, and contractors. It is valuable for compliance-oriented purchasing and for reducing uncertainty in protection planning, especially when a combined encasement and cathodic protection approach is being considered. The standard can also aid quality control by providing a recognized technical reference for evaluating whether the chosen protection method aligns with accepted guidance.

• External corrosion protection guidance
• Polyethylene encasement with cathodic protection
• Ductile iron pipe applications
• Buried pipeline corrosion control
• Specification and procurement reference