Streamline - Fall 2017 - 29

The biggest drawback to mechanical restraint and sleeves is their high
cost-mostly due to labor. The material cost of the lugs is also substantial.
In addition, when using a product with
lugs, the gripping mechanism creates
stress points on the pipe. It can also take
crews a long time to connect the lugs
to the sleeves and ensure the lugs are
tightened properly.
Coupling restraints. Couplingrestraint products, such as Krausz's
HYMAX GRIP family of products, are
relatively new to the market. These couplings use a mechanism to grip the pipes
to restrain them. The products have been
shown to be effective with relatively low
cost compared to the above techniques,
as the restraining technology is within
the coupling itself.
Offered in a wide range of diameters,
coupling restraints can be used on all
metal and plastic pipes in situations
where utility lines either cross or run
parallel to water and wastewater pipes.
Such close pipe-to-pipe proximity makes
it difficult-if not impossible-to install
thrust blocks and rodding. As with all
new techniques, restraint-grip products
have faced some skepticism from installers who are more familiar with techniques such as rodding or thrust blocks.
The HYMAX GRIP also offers continuous dynamic deflection, meaning

the pipe can flex within the coupling
to maintain a strong connection while
preventing pipe pullout. This feature can
substantially help reduce future breaks,
considering ground movement is a key
cause for pipes pulling out. The coupling
restraint's chain of gripping teeth applies
counter-pressure that actually prevents
the pipe's axial motion, thus restraining the pipe. In addition, its patented
progressive hydraulically assisted gasket
that self-inflates using existing water
pressure-as water pressure rises in the
pipe, water enters the gasket that selfinflates and allows for dynamic deflection of the pipes while maintaining a
perfect seal.
To restrain or not to restrain?

Some circumstances definitely require
pipes to be restrained. These include
wastewater lift stations, wells, piping in
water and wastewater treatment plants
and industrial applications that involve
hydrants and valves. In all of these situations, water flow can fluctuate and
involve stresses associated with daily use.
The question of whether to restrain
doesn't always have an obvious answer.
Restraining pipes makes your system
stronger, but if the risk is relatively
small, it might not be worth restraining
the pipe. Cost is always a consideration
whenever making restraint decisions for

By looking at all factors,
including cost, engineers
and system operators
can determine the needs
and benefits of each
solution before deciding
what kind of restraint
is optimal for any
given situation.
your system. It's worth trying to evaluate
the areas of your system that need to be
restrained and which restraint technique
will be most appropriate.
Thus, the question of whether to
restrain piping should be considered
carefully, according to the needs of each
circumstance. By looking at all factors,
including cost, engineers and system
operators can determine the needs and
benefits of each solution before deciding
what kind of restraint is optimal for any
given situation.
Doug Riseden is technical support manager for Krausz USA (www.krauszusa.
com), Ocala, Fla., a coupling and repair
clamp provider for water and wastewater applications.

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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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