PIPELINE DESIGN MANUAL 2017 - WSSC Water

嚜燕IPELINE DESIGN MANUAL

2017

WASHINGTON

SUBURBAN

SANITARY

COMMISSION

REGULATION

APRIL 19, 2017

SUMMARY OF MAJOR CHANGES

2017 PIPELINE DESIGN MANUAL

All revisions/changes to this 2017 Pipeline Design Manual is shown with red text.

GENERAL SECTION

? Add Variance (Waivers) Requirements.

PART ONE 每 WATER DESIGN GUIDELINES

Section 2 每 Pipe Materials and Fittings.

? Change standard exterior coating of Ductile Iron Pipe to Zinc Coating.

? Change all Ductile Iron to be Fusion Bond Epoxy Coating.

Section 4 每 Selection of Pipe Material.

? Revised maximum operating pressure for PVC AWWA C-900 to 130 psi.

? Add requirements for PVC AWWA C-900 fittings to have anode protection.

? Added continuity test stations for PVC AWWA C-900 pipe.

? Added Chart on Determining Type of Pipe Material

Section 8 每 Horizontal Alignment.

? Revised location of water pipelines in streets.

? Add looping water systems requirements

Section 11 每 Vertical Alignment (Profiles).

? Revised requirements for crossing ditches and streams.

Section 17 每 Tunnel or Casing Pipes.

? Added requirements for installing casing pipe around existing water pipelines.

Section 22 每 Specialty Valves.

? Added requirements for Flow Control Valves.

? Revised requirements when Pressure Relief Valves.

Section 24 每 Fire Hydrants.

? Added High Traffic Fire Hydrants requirements.

Section 25 每 Water Services Connections.

? Added operating pressures for water services connections.

? Revised new residential services to be 1-1/2 inches.

? Added Ultrasonic Meter requirements.

? Added requirements for replacing existing detector check meters

? Added requirements for connecting to existing PCCP water pipelines.

PART TWO 每 SEWER DESIGN GUIDELINES

Section 5 每 General Horizontal Alignment.

? Revised location of water pipelines in streets.

Section 8 - Vertical Alignment (Profiles).

? Revised requirements for crossing ditches and streams.

Section 10 每 Tunnel or Casing Pipes.

? Added requirements for installing casing pipe around existing sewer or force main pipelines..

Section 24 每 Force Main Design.

? Added High-Density Polyethylene Pipe requirements.

Section 27 每 Sewer Service Connection.

? Added requirements for 8-inch and larger service connections.

2017

1

PART THREE 每 COMMON DESIGN GUIDELINES

Section 2 每 Easements and Construction Strips.

? Changed Right of Way to Easements.

Section 3 每 Pipeline Crossings and Clearances.

? Revised MTA Light Rail Zone of Influence requirements.

Section 11 每 Loading Analysis of Existing Pipelines.

? Added requirements for PVC AWWA C-900 water and sewer pipelines

Section 16 每 Design of Pipeline Structures.

? Added additional requirements.

Section 22 每 Slope Stability.

? Added additional requirements.

Section 27 每 Thrust Restraint Design for Buried Pipelines.

? Revised restrain joint requirements.

Section 28 每 Corrosion Control.

? Revised requirements for Corrosion Protection.

APPENDIX A 每 DESIGN CHECKLIST

? Updated Checklist.

APPENDIX D 每 WSSC SURVEY AND EASEMENT CRITERIA

? Change Right of Way to Easements.

? Update surveys and easement requirements.

APPENDIX D 每 SUBSURFACE INVESTIGATION REQUIREMENTS FOR WATER AND SEWER

DESIGN AND CONSTRUCTION.

? Updated requirements for subsurface investigations.

APPENDIX E 每 SOIL INVESTIGATION FOR SOFT GROUND TUNNEL PROJECTS.

? Updated requirements for subsurface investigations.

2017

2

PROPOSED REVISIONS

to the

WSSC Pipeline Design Manual

Manual Part

Manual Users Name

Section Number

Page Number

Phone (

)

Email Address

Company

Address

Proposed Revision: In the space below, please provide a detailed description of your suggested change

or revision to the Pipeline Design Manual. All comments or recommendations for revisions are encouraged

to point out discrepancies, suggested modifications or recommendations for additional information,

examples, etc. to be added. Please include a descriptive reason for the change or addition, attach any

necessary pages and supporting documentation and mail it to the address below.

Mail to:

Washington Suburban Sanitary Commission ? Technical Services Group ? 14501 Sweitzer Lane ? Laurel, MD 20707

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