Streamline - Fall 2017 - 26

When and How to Use Piping Restraints
Piping restraints play an essential role in ensuring safe water and wastewater
system operations. However, it's important to evaluate criteria such as local
soil conditions, materials, existing infrastructure, deflection, seismic activity,
and cost to determine the most appropriate restraint to use.
BY DOUG RISEDEN
RESTRAINING TECHNIQUES ENSURE

piping stays connected and help prevent
costly repairs that can shut down a water
or wastewater system. Mechanical-joint
piping connections such as 45s, 90s, end
caps and hydrant connections are common points of restraint, as well as connections within wells, wastewater lift
stations and treatment plants.
Restraining inline piping has become
so common that the practice is often a
matter of standard procedure among city
or project engineers. Instead of using
restraints for specific applications,
some engineers use restraints throughout entire systems. Adding restraints

26 S T R E A M L I N E * F a l l 2 0 1 7

in this manner can be expensive and
increase project costs significantly. It's
worth examining what criteria should
be followed for restraining pipe connections and which techniques to use within
particular conditions and environments.
Criteria for restraining pipe

Although engineers typically decide
when and how to restrain pipes, utility managers can and should be part
of the process. Once a piping system is
completed, it's in their hands to ensure
the system works properly and to make
repairs, so it's essential to include their
input. The first things to examine are

the factors that may affect the chances
of pipe movement and separation.
Important criteria to consider include
the nature of the piping system, ground
movement and other ground stresses.
The nature of the piping system.
The first consideration is the design of
the piping system itself. In a pressurized
buried pipeline, such as a water main
or wastewater force main, axial thrust
forces act on the pipe based on changes
in fluid velocity, pipe size or pipeline
direction. This generally happens at fittings such as plugs, caps, valves, tees,
bends or reducers. Such hot spots definitely need to be restrained.



Table of Contents for the Digital Edition of Streamline - Fall 2017

From the President: Accomplishment
From the Executive Director: Time Flies…
VRWA Said “Goodbye” to Board Member and Friend Roy Markham
Basic Management Skills
Lessons from Louisiana
Planning for the Future
The 2017 Virginia Water Resources Progress Report
The Benefits of Pipe Marking for Water and Wastewater Facilities
Water and Environmental Programs
Recipe for Sustainably Managing Utilities
When and How to Use Piping Restraints
NRWA Recap
Throwing My Loop: Cowboy Up…
VRWA Member Corner
eLearning Benefits
Membership Application
Benefits for VRWA Members
Board of Directors
VRWA Committees
Index to Advertisers/Ad.com
Streamline - Fall 2017 - Intro
Streamline - Fall 2017 - cover1
Streamline - Fall 2017 - cover2
Streamline - Fall 2017 - 3
Streamline - Fall 2017 - 4
Streamline - Fall 2017 - 5
Streamline - Fall 2017 - 6
Streamline - Fall 2017 - From the President: Accomplishment
Streamline - Fall 2017 - 8
Streamline - Fall 2017 - From the Executive Director: Time Flies…
Streamline - Fall 2017 - 10
Streamline - Fall 2017 - VRWA Said “Goodbye” to Board Member and Friend Roy Markham
Streamline - Fall 2017 - 12
Streamline - Fall 2017 - Basic Management Skills
Streamline - Fall 2017 - 14
Streamline - Fall 2017 - Lessons from Louisiana
Streamline - Fall 2017 - 16
Streamline - Fall 2017 - 17
Streamline - Fall 2017 - 18
Streamline - Fall 2017 - Planning for the Future
Streamline - Fall 2017 - The 2017 Virginia Water Resources Progress Report
Streamline - Fall 2017 - The Benefits of Pipe Marking for Water and Wastewater Facilities
Streamline - Fall 2017 - 22
Streamline - Fall 2017 - 23
Streamline - Fall 2017 - Water and Environmental Programs
Streamline - Fall 2017 - Recipe for Sustainably Managing Utilities
Streamline - Fall 2017 - When and How to Use Piping Restraints
Streamline - Fall 2017 - 27
Streamline - Fall 2017 - 28
Streamline - Fall 2017 - 29
Streamline - Fall 2017 - 30
Streamline - Fall 2017 - NRWA Recap
Streamline - Fall 2017 - 32
Streamline - Fall 2017 - Throwing My Loop: Cowboy Up…
Streamline - Fall 2017 - 34
Streamline - Fall 2017 - VRWA Member Corner
Streamline - Fall 2017 - 36
Streamline - Fall 2017 - eLearning Benefits
Streamline - Fall 2017 - Membership Application
Streamline - Fall 2017 - Benefits for VRWA Members
Streamline - Fall 2017 - 40
Streamline - Fall 2017 - VRWA Committees
Streamline - Fall 2017 - Index to Advertisers/Ad.com
Streamline - Fall 2017 - cover3
Streamline - Fall 2017 - cover4
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