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**Inflatable Plug Warning:
Maximum head pressures that a pipe plug may restrain can only be
estimated. Slippage is influenced by many factors including
fluid in the pipe, coefficient of pipeline friction, pressure
required to inflate the plug, and accuracy of pressure gauges.
Generally, a Multi-Flex™ Inflatable Plug inserted fully into
pipeline will begin slipping between 50% and 80% of the
inflation pressure if it has an inflated pipe contact length of
1 ˝ to 2 times the diameter, but even a head pressure of 50% of
the inflation pressure may cause slippage with some liquids. The
inflation pressure is also subject to temperature change and
debris or protrusions in the pipeline that could rupture the
plug. The inflation pressure should be monitored and plugs
anchored and/or mechanically blocked when slippage could cause
property damage or injury. NEVER use a test pressure greater
than the capacity of the weakest pipe or component in the
system. NEVER use an inflatable plug when its failure could
cause injury or catastrophic damage. NEVER use an inflatable
plug as the only means of protection for personnel working down
stream. |
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