|
Purpora Engineering, Inc.
(originally listed by Alert Technologies, Inc.)
Alert Model 2000 In-Tank Mass Measurement Probe System
(Mass Buoyancy Probe)
AUTOMATIC
TANK GAUGING METHOD
|
Certification
|
Leak
rate of 0.2 gph with PD = 95.4% and PFA = 4.6% (calculated
based on a 1-hour test).
|
|
Leak
Threshold
|
0.1
gph.
A tank system should not be declared tight if the test
result indicates a loss or gain that equals or exceeds
this threshold.
|
|
Applicability
|
Gasoline,
diesel, aviation fuel, fuel oil #4, waste oil.
Other liquids with known coefficients of expansion and
density may be tested after consultation with the manufacturer.
|
|
Tank
Capacity
|
Maximum
of 15,000 gallons.
Tank must be between 50 and 95% full.
|
|
Waiting
Time
|
Minimum
of 15 hours between delivery and testing.
There must be no delivery during waiting time.
|
|
Test
Period
|
Minimum
of 2 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from data determined to be valid
by statistical analysis.
There must be no dispensing or delivery during test.
|
|
Temperature
|
Product
measurement not required.
System measures product mass (which is not affected by
temperature) instead of product volume.
|
|
Water
Sensor
|
Must
be used to detect water ingress.
Minimum detectable water level in the tank is 0.175 inch
(0.27 inch for waste oil).
Minimum detectable change in water level is 0.088 inch
(0.031 inch for waste oil).
|
|
Calibration
|
Mass
measurement probe and water sensor must be checked and,
if necessary, calibrated in accordance with manufacturer's
instructions.
|
|
Comments
|
Not
evaluated using manifolded tank systems. Therefore,
this certification is only applicable when there is
a probe used in each tank and the siphon is broken during
testing.
Tests only portion of tank containing product.
As product level is lowered, leak rate in a leaking
tank decreases (due to lower head pressure). Consistent
testing at low levels could allow a leak to remain undetected.
EPA leak detection regulations require testing of the
portion of the tank system which routinely contains
product.
System is battery operated and does not automatically
generate a hard copy of the leak test result. However,
a hard copy of the results can be obtained by transfer
of data to another unit (see manufacturer's instructions
for further details).
System is not equipped with any alarms (e.g. high water
alarm, or failed leak test alarm).
The manufacturer does not support test results if the technician does not hold a current Alert Technologies certification when the test is performed. Recertification is required by the manufacturer every two years.
California regulations
require at least one test per month after routine product
delivery or when the tank is filled to within 10% of
the highest operating level of previous month.
|
Purpora Engineering, LLC
P.O. Box 80265
Saukville, WI 53080
Tel: (800) 352-2011
E-mail: info@purporaengineering.com
URL: www.purporaengineering.com |
Evaluator: Midwest Research Institute
Tel: (816) 753-7600
Date of Evaluation: 03/11/91
|
|
