2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...

Chapter 5 Water Infrastructure
5.3 GENERAL REQUIREMENTS
The design engineer must be familiar with water industry standards and code requirements.
If industry standards and City of Seattle requirements or regulations conflict, the design
engineer must discuss the discrepancy with the line-of-business (LOB) owner, Facilities
Maintenance and Operations manager, specifier and the owner of this DSG chapter through the
formal resolution process.
5.3.1 Industry Standards
Water facilities must be designed to American Water Works Association (AWWA) standards. In
addition, water facilities must meet Seattle-King County and Washington State Department of
Health (DOH) standards.
Water storage facility design standards for SPU must also meet standards set forth in the Water
Research Foundation’s Maintaining Water Quality in Finished Water Reservoir.
5.3.1.1 American Water Works Association
AWWA standards and specifications must be followed, except when superseded by more strict
requirements set forth in this DSG and City of Seattle Standard Plans and Specifications.
Table 5-1 lists relevant AWWA standards and specifications, organized by subject and intended
as minimum requirements. Most of the specifications listed below may be found in the SMT
45th floor library. It is the design engineer's responsibility to use the latest version of these
standards.
Table 5-1
AWWA Standards and Specifications for SPU Water Facilities
Designation
Title
Ductile-Iron Pipe:
C104/A21.4 Cement Mortar Lining for Ductile Iron (DI) Pipe and Fittings for Water
C116/A21.16 Protective Fusion-Bonded Epoxy Coatings Interior or Exterior Surface DI
C105/A21.5 Polyethylene Encasement for DI Pipe Systems
C111/A21.11 Rubber-Gasket Joints for DI Pressure Pipe and Fittings
C115/A21.5 Flanged DI Pipe with Ductile Iron or Gray Iron Threaded Flanges
C150/A21.50 Thickness Design of Ductile Iron Pipe
C151/A21.51 DI Pipe; Centrifugally Cast, for Water or Other Liquids
C153/A21.53 DI Pipe; Compact Fittings for Water Service
Steel Pipe
C200
Steel Water Pipe 6” and larger
C207 Steel Pipe Flanges for Waterworks Service Sizes 4”-144”
C216
Heat-Shrinkable Cross-Linked Polyolefin Coatings for the Exterior of Special Sections,
Connections and Fittings for Steel Water Pipes
C206
Field Welding of Steel Water Pipe
C215
Extruded Polyolefin Coatings for the Exterior of Steel Water Pipelines
C217
Petrolatum and Petroleum Wax Tape Coatings for the Exterior of Connections and
Fittings for Steel Water Pipelines
C210
Liquid-Epoxy Coating Systems for the Interior and Exterior of Steel Water Pipelines
C225
Fused Polyolefin Coating Systems for the Exterior of Steel Water Pipelines
C223
Fabricated Steel and Stainless Steel Tapping Sleeves
SPU Design Standards and Guidelines
5-9