Figure 1.
The SmartTrack™ remote tracking and pressure monitoring system (pictured on top) uses through-wall
communication technology to track and monitor the SmartPlug tool as it travels through a pipeline.
sound
SAFE
Gary Anderson,
T.D. Williamson,
Norway,
discusses
how offshore operators
are benefiting from
the versatility of
double-block, remotely
operated pipeline
pressure isolation
technology.
C
omplex. Daunting. A huge responsibility. There isn’t a pipeline
engineer who has not felt weighed down by the burden of
maintaining a pipeline network at peak operating levels. The task is
made more challenging as the network must maintain continuous
flow while repairs and modifications are made to the line.
In response to those engineers and the operators they work for, the
advancement in pipeline service technology continues. There are now field-
proven systems that make these daunting tasks more manageable, simpler and
less expensive.
A primary method of maintaining pipeline flow while essential work is
carried out is to isolate the work zone from the line’s pressure. This method
is industry preferred, not only because it creates a safe environment in
which work is performed, but because it makes it possible to complete work
without the added expense and disruption of venting or flooding the pipeline,
or displacing pipeline inventory.
Topside isolations are commonly executed to facilitate valve replacement
on offshore platforms attached to gas export lines. For gas export lines
attached to an onshore processing plant, it is a popular method for replacing
the beach valve or valves closest to the receiver. It is also used in repairing
subsea pipelines that require cut-out and spool replacement, constructing
sections of new pipeline located in close proximity to the platform area,
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