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<<Hot tapping is defined as using an under pressure drilling machine to cut
a hole in an operating pipeline allowing for a new take off from the
original pipe. This process is done without any product leakage or loss.>>
See the rest of the text and animation of a hot tap procedure at: <a href="http://www.hottaps.com/tapping.htm">http://www.hottaps.com/tapping.htm</a>
Basic Information and Procedures For Line Tapping And Linestopping From Hydra-Stop
<<Linestopping is essentially the installation of a temporary valve in a
line where one presently does not exist. The existing pipe serves as part of
the sealing surface for the temporary valves. There are four general types
of linestops or pressure plugs. The first effects stoppage with a
cylindrical plug sealing against machined surfaces of the pipe. These can
either be the elastomer type stoppers or a steel wedge type stopper.
Probably the most popular is the second method where an elastomer cup seals
against the pipe bore. This seal is effected by line pressure and is
available in the greatest range of pressures and sizes. In the third type of
stopper, an expandable elastomer stopper seals against the bore of the pipe.
This type is for low pressure application only. An inflatable gas bag or
balloon sealing against the bore of a pipe is the fourth type of stopping
device. This seal is generally independent of line pressure and must be
restricted to very low pressures.>>
See the rest of the text and graphics of a line stop procedure at: <a href="http://www.hydra-stop.com/pressure/LineStop.html#GENERAL">http://www.hydra-stop.com/pressure/LineStop.html#GENERAL</a> Received on Thu Jul 06 22:33:00 2000
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