Underground Construction - December 2022 - 44
REHAB Technology
of head, if the pressure comes from
liquid such as water or sewage.
* What is the access opening the plug
needs to fit through to be installed?
Most commonly, this would be the
diameter of the manhole the plug
must be passed through before it
is installed. Many Muni Balls have
flexible hose bypasses that allow the
plug to be bent up to 45 degrees to
aid in installation.
* What is the temperature of the
media being blocked? Natural
rubber should not be exposed to
temperatures exceeding 125 degrees
Fahrenheit, as it will begin to melt.
* Will there be any oils, hydrocarbons,
or petrochemicals in the media that
needs to be blocked? These may
harm natural rubber and cause it
to degrade. Please consult with the
factory if your application involves
blocking such substances.
Special care needs to be taken before
and after a Muni Ball, or any pneumatic
plug, is placed into service:
* Inspect the rubber body of the
plug for punctures, bulges, cracks,
corrosion, and leaks.
* Inspect the end plates of the plug for
cracks, loose fit, missing or damaged
eyebolts, rusty end plates and fittings,
and damaged inflation fittings.
If any of these appear, we recommend
consulting the Cherne, or other manufacturer,
factory.
Plug installation
While installing a bypass plug:
* Make sure an extension hose with
an accurate pressure gauge is used to
safely inflate the plug, monitor its air
pressure while in use, and deflate the
plug from a safe distance.
* Always ensure the pipe the plug is
being installed in is inspected and
debris, such as gravel or broken
glass, is removed.
* Avoid installing the plug over
any exposed rebar.
* Ensure the plug is inflated to the
exact inflation pressure prescribed by
the manufacturer.
After the work is completed, eliminate
any back pressure in the pipe before
deflating the plug. Do not attempt to remove
the plug from the pipeline until it
has been completely deflated.
Most damage occurs to plugs when
they are either being installed or removed
from the pipe. A safety instruction manual
is provided with each Muni Ball when
it leaves the factory. Make sure you review
it and understand all precautions.
A safe pipe plug usage video is available
online at Cherne Product Safety
Video-YouTube UC
ABOUT THE AUTHOR: Pete Rogers is an
inside sales specialist at Cherne Industries (part
of the Oatey family of companies). He has been
with Oatey Co. for more than 50 years. He can
be reached at chernesupport@oatey.com.
FOR MORE INFORMATION
Cherne, (800)-843-7584, oatey.com
The #1 source for underground
infrastructure professionals
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44 DECEMBER 2022 | UCONonline.com
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Underground Construction - December 2022
Table of Contents for the Digital Edition of Underground Construction - December 2022
Underground Construction - December 2022 - 1
Underground Construction - December 2022 - 2
Underground Construction - December 2022 - 3
Underground Construction - December 2022 - 4
Underground Construction - December 2022 - 5
Underground Construction - December 2022 - 6
Underground Construction - December 2022 - 7
Underground Construction - December 2022 - 8
Underground Construction - December 2022 - 9
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Underground Construction - December 2022 - 11
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