13
DANGER NEVER ENTER INTO THE FORESEEABLE DANGER
ZONE WHEN A PNEUMATIC PLUG IS INFLATED EVEN IF NO BACK
PRESSURE EXISTS IN THE PIPE! IF YOU OR ANYONE ELSE IS IN
THE DANGER ZONE AND THE PLUG FAILS OR DISLODGES FOR ANY
REASON, FAILURE TO HEED THIS WARNING MAY RESULT IN DEATH,
SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE!
MONITOR BACK PRESSURE DURING PLUG USE. Monitor water back
pressure by attaching a calibrated pressure gauge or a vertical sight tube
to the bypass of a Muni-Ball® plug. A gauge must be located at pipe
centerline to accurately measure water pressure. Other applications may
allow direct measurement of the water column height restrained by the
plug. Air back pressure can be monitored by attachment of a calibrated
pressure gauge to the plug bypass port using an extention hose. This
allows accurate back pressure readings from a remote location outside of
the Danger Zone.
DANGER
ZONE
DANGER
ZONE
TO
SEWER
C
L
PIPE
WATER
WATER
WATER
DANGER
ZONE
DANGER
ZONE
DANGER
ZONE
SOME
APPLICATIONS
ALLOW DIRECT
MEASUREMENT
OF WATER
HEIGHT
ATTACH A CLEAR
SIGHT TUBE TO
MUNI-BALL® PLUG
BYPASS TUBE
ATTACH CALIBRATED
PRESSURE GAUGE TO
MUNI-BALL® PLUG
BYPASS TUBE
GAUGE PORT READING MUST BE
CORRECTED FOR HEIGHT ABOVE
PLUG CENTERLINE
A CALIBRATED PRESSURE
GAUGE CAN REMOTELY
PROVIDE ACCURATE AIR
BACK PRESSURE
MEASUREMENT
AIR
WATER HEIGHT
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