Use and Care Guide

4
Safety Precautions
Death, bodily injury and/or
property damage could result if plug fails
for any reason. Unsafe practices can also
result in death or severe injury.
The following information provided
under “General Information,”
“Preparation Before Use,” “Operation,”
and “Maintenance and Storage” must
always be followed. Pay careful attention
to safety information highlighted by this
symbol:
General Information
Follow all safety instructions contained in
OSHA and federal, state, and local regulations.
Do not use the plug if any conditions exist that
could jeopardize the safety of personnel or
property.
Conned Space Entry: Follow Federal,
State, local and/or company requirements for
entry into conned spaces.
Danger Zone: When a plug is in use, a
danger zone exists that expands outwardly
in a cone shape. NEVER enter the danger
zone when a plug is in use.
Preparation Before Use
1. Plug Selection: Select the proper
plug and related equipment. Every pipe
plug has performance specs listed
on the plug and /or in the literature.
Contact Cherne Industries or dealer for
recommendations.
2. Back Pressure Determination:
Determine maximum back pressure the
plug must withstand. Back pressure is
the pressure (air or liquid) in front or
back of the plug that it must restrain.
Never exceed the plug’s back
pressure rating. Maximum back
pressure ratings listed are for
plugs installed in clean, dry pipe
of nominal size. Usage of plugs
in pipeline that varies from these
conditions could reduce maximum
allowable back pressure.
3. Plug Size Selection: Pipe plugs have
a minimum and maximum sealing size
range. Verify the pipe inside diameter is
within the plug’s sealing (usage) range.
4. Pipe Design: Plug performance
could vary depending on pipe types.
For example, in corrugated pipe, plug
back pressure rating drops by 50%.
Contact Cherne Industries or dealer for
recommendations.
5.
Calibrated gauges: Failure to use
calibrated gauges could result in plug
over-ination or under-ination which
could lead to plug failure.
Monitor ination and back pressure
with calibrated pressure gauges only.
Use calibrated gauges and proper hoses
to monitor pressure, inate, and deate
the plug from outside of danger zone.
Contact Cherne Industries or dealer for
recommendations.
6. Cleaning and Inspection: Plugs must
be clean and inspected before and after
every use. Do not use a plug if it
has or shows any signs of wear
or deterioration. All natural rubber
products degrade over time, even if
they are used infrequently, stored
properly, and show no external