ANSI AWWA D108-19 PDF

Full title and description

ANSI/AWWA D108-19 — Aluminum Dome Roofs for Water Storage Facilities. This AWWA standard establishes minimum criteria for the design, fabrication, and erection of structurally supported aluminum dome roofs used on water-storage tanks; when specified it governs in the event of conflict with other standards.

Abstract

Provides requirements and recommended practices for aluminum dome roofs that are spherical in form and intended to be supported by tanks designed in accordance with AWWA standards. Topics include materials, structural design references, fabrication details, fasteners and connections, coatings/finishes, and erection practices to ensure safe, durable roof performance on potable-water storage facilities.

General information

• Status: Active (current AWWA publication as of 2019).
• Publication date: Approved June 7, 2019; published/effective 2019 (D108-19 edition).
• Publisher: American Water Works Association (AWWA); American National Standards Institute (ANSI) approval noted.
• ICS / categories: 77.150 (Products of non-ferrous metals); 91.060 (Elements of buildings); 91.100 (Construction materials).
• Edition / version: D108-19 (revision of ANSI/AWWA D108-10; second edition published 2019).
• Number of pages: 32 pages (standard document length).

Scope

This standard covers minimum criteria for the design, fabrication, and erection of aluminum dome roofs that are structurally supported by water-storage tanks. It applies to dome geometry, material selection, panel fabrication, connections, fasteners, coatings/finishes, and erection procedures; the tank structure itself must be designed to carry roof loads. The standard is intended for aluminum dome roofs on tanks erected in accordance with AWWA standards and takes precedence if conflicts with other referenced standards occur.

Key topics and requirements

• Design requirements for dome geometry and structural support, including load considerations and compatibility with the supporting tank structure.
• Materials: recommended aluminum alloys (AA3000 or AA5000 series noted), minimum panel thickness requirements (for example a typical minimum nominal thickness of 0.050 in / 1.27 mm is specified for certain panels).
• Fasteners and attachments: allowable materials include aluminum or austenitic stainless steel; stainless fasteners used to attach aluminum to carbon steel require electrical isolation to prevent galvanic corrosion.
• Welding and fabrication: references to applicable welding codes (for example AWS D1.2 for aluminum structural welding) and fabrication tolerances are included.
• Coatings and finishes: requirements and options for exterior and interior coatings, including guidance for long-term weathering and nonglare finishes.
• Erection and installation practices: sequencing, temporary supports, fastener torquing/lock methods, and inspection criteria to ensure safe installation.
• Referenced test methods and consensus standards (selected ASTM, AWS, and other AWWA standards cited for materials and testing).

Typical use and users

Used by municipal water system owners, consulting engineers, tank fabricators, erection contractors, inspection and testing firms, and regulatory reviewers involved in the specification, manufacture, installation, and acceptance of aluminum dome roofs for potable-water storage tanks.

Related standards

Frequently referenced AWWA storage and tank standards (for coordination with tank design and coatings) include AWWA D100 (Welded Carbon Steel Tanks), D103 (Factory-Coated Bolted Carbon Steel Tanks), and other D-series tank standards. The document also references AWS welding codes and relevant ASTM material and coating specifications as normative or informative references.

Keywords

Aluminum dome roof, water storage tank roof, AWWA D108-19, dome fabrication, aluminum alloys, roof fasteners, coatings, tank roof erection, welding (AWS D1.2), potable-water storage.

FAQ

Q: What is this standard?

A: ANSI/AWWA D108-19 is the AWWA standard that specifies minimum criteria for the design, fabrication, and erection of structurally supported aluminum dome roofs for water-storage facilities.

Q: What does it cover?

A: It covers material selection, panel and fastener requirements, fabrication and welding guidance, coatings and finishes, erection procedures, and references to related codes and test methods needed to produce and install aluminum dome roofs.

Q: Who typically uses it?

A: Municipal water utilities, consulting and structural engineers, tank manufacturers and fabricators, erection contractors, inspectors, and procurement/specification authors use this standard when specifying or evaluating aluminum dome roofs.

Q: Is it current or superseded?

A: D108-19 is the 2019 revision (second edition) that supersedes ANSI/AWWA D108-10; it is the current AWWA D108 edition published in 2019.

Q: Is it part of a series?

A: Yes — D108 is part of AWWA’s D-series storage standards that cover tanks, roofs, coatings, and related components; it is intended to be used in conjunction with other AWWA tank and storage standards (for example D100, D103 and related D-series documents).

Q: What are the key keywords?

A: Aluminum dome roof, water storage, AWWA D108, aluminum alloy, dome fabrication, roofing fasteners, coatings, tank roof erection, welding standards.