CHERNE Test-Ball - Plug Installation and Inflation; Proper Plug Placement in Pipe

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10. PROPER PLUG PLACEMENT IN PIPE.
POSITION THE PLUG INTO PIPE A MINIMUM DISTANCE OF ONE PIPE
DIAMETER. Pneumatic plugs may elongate upon ination, forcing the plug
to protrude from pipeline and resulting in failure if not initially placed far
enough into the pipe.
PLUGS USED FOR VACUUM TESTING OF MANHOLES.
When plugs
are used to seal the pipes entering a manhole for a vacuum test, the plugs
must be placed well into the pipe beyond the manhole’s sealing boot
areas. Failure to properly position the plugs will prevent the sealing boot
areas from being adequately tested, and leaks or bad seals may not be
discovered. When a manhole is vacuum tested before being backlled, the
incoming pipes and plugs must be properly braced or blocked to prevent
the pipes from being pulled into the manhole during the test.
PLACE PLUG INTO
PIPELINE A MINIMUM
DISTANCE OF ONE
PIPELINE DIAMETER
PLUGS MAY
ELONGATE
UPON
INFLATION
PIPE
DIAMETER
-D-
WHEN USING PLUGS FOR VACUUM TESTING,
PLACE PLUGS BEYOND SEALING BOOTS TO
INSURE THE BOOT AREA IS PROPERLY TESTED
SEALING BOOTS