ANSI AWWA D106-20 PDF

Full title and description

ANSI/AWWA D106-20 — Sacrificial Anode Cathodic Protection Systems for the Interior Submerged Surfaces of Steel Water Storage Tanks. This AWWA standard provides minimum requirements for design, components, installation, operation, and maintenance of sacrificial (galvanic) anode cathodic protection systems used to minimize corrosion of interior submerged steel tank surfaces; it does not cover impressed-current systems.

Abstract

This document defines design criteria, materials, installation practices, testing, inspection, and recordkeeping for sacrificial-anode cathodic protection applied to the interior submerged surfaces of steel potable-water storage tanks. It is intended for use in specifications, procurement, and construction to extend the service life of submerged tank surfaces while addressing compatibility with interior coatings and potable-water requirements. The standard excludes automatically or manually controlled impressed-current systems.

General information

• Status: Published as AWWA D106-20 (2020); subsequently revised by AWWA D106-2024 (see revision history).
• Publication date: 2020 (commonly listed with an effective/publication date of August 1, 2020).
• Publisher: American Water Works Association (AWWA); ANSI-designated AWWA standard.
• ICS / categories: Listed by some providers under ICS 75.200 (related equipment for handling fluids) and broadly categorized under water storage and corrosion-protection standards.
• Edition / version: 2020 edition (designated D106-20).
• Number of pages: Approximately 36 pages (publisher and standards resellers list the document at ~36 pages).

Scope

Specifies minimum requirements when sacrificial-anode cathodic protection is used on interior submerged steel surfaces of water-storage tanks. Topics include system design, anode selection and placement, materials, installation procedures, inspection and testing, operation and maintenance, and documentation. The standard clarifies applications covered (potable, reclaimed, and wastewater storage contexts as applicable) and explicitly excludes impressed-current CP systems; disinfection and interior cleaning procedures are addressed by other AWWA standards (for example, see AWWA C652).

Key topics and requirements

• Definitions and scope limits for sacrificial-anode (galvanic) cathodic protection versus impressed-current systems.
• Design principles: anode type and material selection, expected life calculations, placement spacing relative to submerged surface area, and considerations for dissimilar metals and coatings.
• Materials and potable-water compatibility requirements (references to NSF/ANSI/CAN standards and material acceptance where applicable).
• Installation and workmanship requirements, including coordination with tank coating systems, welding/repair practices, and safe access/egress during interior work.
• Testing, verification, and inspection criteria (pre- and post-installation electrical measurements, continuity checks, and periodic monitoring).
• Operation, maintenance, replacement planning, and recordkeeping to assure continued protection and documented anode performance.
• References and normative/informative annex material providing related standards and background guidance for design considerations in water and wastewater applications.

Typical use and users

Used by water-utility engineers, structural and corrosion-control consultants, tank manufacturers, construction contractors, inspection firms, and owners specifying or maintaining cathodic protection for steel water-storage tanks. It is applied during new tank design, retrofit projects, interior rehabilitation, and long‑term asset‑management planning where submerged corrosion protection is required.

Related standards

Commonly referenced alongside other AWWA and industry documents such as AWWA D100 (welded carbon steel tanks), AWWA D102/D103 (related tank construction/repair/inspection), AWWA D107 (composite elevated tanks), AWWA C652 (disinfection of water storage facilities), NACE/AMPP practices for internal galvanic anodes, and relevant ASTM and ISO coating and surface-preparation standards. These normative and informative references support coating compatibility, workmanship, and testing protocols.

Keywords

sacrificial anode; cathodic protection; galvanized anode; galvanic anode; water storage tank; interior submerged surfaces; steel tank corrosion; AWWA D106-20; tank rehabilitation; potable water compatibility; anode installation; CP monitoring.

FAQ

Q: What is this standard?

A: ANSI/AWWA D106-20 is an American Water Works Association standard that sets minimum requirements for sacrificial-anode cathodic protection systems applied to interior submerged surfaces of steel water-storage tanks.

Q: What does it cover?

A: It covers design, material selection, installation, testing, inspection, operation, maintenance, and documentation specific to sacrificial (galvanic) anode systems for interior submerged tank surfaces. It does not cover impressed-current CP systems or interior disinfection procedures (see AWWA C652 for disinfection).

Q: Who typically uses it?

A: Water utilities, tank designers and fabricators, corrosion-control and coatings consultants, contractors performing interior tank work, inspection agencies, and specifiers developing procurement documents for CP systems.

Q: Is it current or superseded?

A: D106-20 is the 2020 edition; AWWA has issued a subsequent revision (AWWA D106-2024). Users should consult the AWWA/ANSI listings and obtain the latest edition (D106-2024 where applicable) for current requirements.

Q: Is it part of a series?

A: Yes — D106 is part of AWWA's family of standards addressing steel water-storage tanks, coatings, disinfection, and related construction/inspection practices (see AWWA D100, D102, D103, D107, C652, and M42 for related guidance).

Q: What are the key keywords?

A: Sacrificial anode, cathodic protection, galvanic anode, water storage tank, interior submerged surfaces, corrosion protection, AWWA D106-20.