POWER May 2015 - 41
OPERATIONS AND MAINTENANCE
6. Snakelike. The pull-guide tool can be
sucked through the line with a vacuum cleaner
and then retrieved with the unit head attached.
Courtesy: LeakTronics
tor stops pulling the cable and switches the
unit head connection from the amplifier to
the FLASH driver. The driver emits a 512-Hz
frequency signal from the unit head, which
the operator then locates using the FLASH
receiver. The receiver, or scanner, has an analog
meter and external speaker, allowing the
operator to pinpoint the spot above ground,
under which the unit head is located in the
buried pipe. The location is then marked and
excavation can begin.
Knowing exactly where the leak is located
allows excavation and repair efforts to be focused
in the correct area, preventing unnecessary
work, which saves time and money. This
is especially important if the pipe is embedded
in concrete or runs underneath pavement. Merlob
says the receiver will reliably detect the unit
head through 4 feet of solid concrete, and up to
15 feet of soil, depending on the type of dirt. To
see an animated demonstration of the FLASH
system online, visit: bit.ly/1HMUEQ2. ■
-Aaron Larson is a POWER associate
editor.
7. A pill for your ills. At less than ¾
inch x 1½ inch, the FLASH unit head contains
a microphone and can emit a 512-Hz frequency
signal. Courtesy: LeakTronics
If you need information on
the global power
generation industry,
look to
first.
IN PRINT, IN PERSON, AND ONLINE
order to allow a slight pressure to be applied
to the line. In the case of the opening through
which the unit head cord protrudes, a slide
plug is provided in the kit, which allows the
unit head to be pulled through the pipe while
the line remains relatively pressure tight. The
slide plug also facilitates connection of a pressure
rig, which is used to pressurize the piping
being tested to about 6 psig with air.
The unit head and a set of headphones are
connected to the FLASH amplifier, and then
the head-which contains a microphone-is
slowly pulled back through the pipe while the
operator listens for the leak using the headphones.
When the microphone reaches the
exact location of the leak, the operator will
hear a distinctive jet noise. The sound identifies
the location where air is exiting through
the hole in the pipe.
Once the leak has been found, the operaMay
2015 | POWER
POWER maga COAL POWER
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41
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POWER May 2015
Table of Contents for the Digital Edition of POWER May 2015
Contents
POWER May 2015 - Cover1
POWER May 2015 - Cover2
POWER May 2015 - Contents
POWER May 2015 - 2
POWER May 2015 - 3
POWER May 2015 - 4
POWER May 2015 - 5
POWER May 2015 - 6
POWER May 2015 - 7
POWER May 2015 - 8
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POWER May 2015 - Cover3
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