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VPAC 5131 |
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Digital AE leak detector for valves |
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General Information
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The system detects
leaks in valves and determines the rate of any leakage in a
matter of seconds. A microprocessor based algorithm is
embedded in the product to reduce background noise and
to accentuate leak signals above the noise. |
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With this
instrument, plant maintenance staff can be trained in minutes to
find the leaks and quantify the leak rates. With data downloaded
to a simple MS ExcelTM spreadsheet, plant operators
can easily prioritize which leaks to fix, and help companies
make the most of their limited maintenance budgets. |
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| Purpose |
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The Model 5131/VPAC is an
intrinsically safe digital AE leak detector. Widely used in
refineries, chemical plants and offshore platforms, the 5131
estimates through-valve gas leakage. |
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Loss control for refineries,
chemical plants and offshore platforms
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Identifies through-valve gas
losses
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Field proven |
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Fully digital |
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Usability |
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Battery operated |
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| Database |
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The basis
of VPAC is a database built up by British Petroleum over
the past decade that estimates leak rate from the
acoustic signal level, taking into account valve type,
size, and pressure. The database was built up by
removing valves from service that had been identified as
leaking by the use of the portable monitor, and testing
them under controlled conditions in the laboratory.
Several hundred measurements were made. This data is
included in the package in both numeric and graphical
form, together with procedures for making site
measurements and calculating losses. |
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Benefits
B.P. uses this technology in its operations and
loss-control, resulting in a very fast payback. Site
experience has shown that 5-10% of valves leak, and 1-2%
of valves cause 70% of total loss. Savings in excess of
$100,000 per site are easily achieved. Where gas
recovery systems are in use, monitoring product valve
leakage helps to identify and estimate the extent of the
downgrading of valuable products to fuel gas due to
valve leakage. This is something previously identified
by the flare, but goes unseen with gas recovery in use.
Cost savings are achieved in maintenance planning,
troubleshooting plant operations and monitoring of
losses for environmental purposes. |
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Predictive Equation
Using their database, B.P. developed an calculation that
estimates losses from the input data. This is provided as part
of the package in a spreadsheet form, which makes use very easy
on a PC. It is particularly useful on large sites that have many
hundreds of valves. It is also provided in a graphical form for
quick use out in the plant. |
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Literature |
On-line
VPAC for valves (207KB) |
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