Issue Date: November 22,
1995
Revision Date: September 2, 2008
Estabrook
EZY CHEK Systems
(originally listed as
Horner EZY CHEK)
EZY-Chek
II
VOLUMETRIC
TANK TIGHTNESS TEST METHOD (UNDERFILL)
Estabrook EZY Chek Systems no longer manufactures or supports the use of this method.
Certification
|
Leak
rate of 0.1 gph with PD = 95.79% and PFA = 4.21%.
|
Leak
Threshold
|
0.05
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.
Other liquids with known coefficients of expansion and
density may be tested after consultation with the manufacturer.
|
Tank
Capacity
|
Maximum
of 12,000 gallons.
Tank must be between 98 and 100% full.
|
Waiting
Time
|
Minimum
of 8 hours between delivery and testing.
There must be no product dispensing or delivery during
waiting time.
|
Test
Period
|
Minimum
of 1 hour, 40 minutes (33 minutes monitor mode and 1 hour,
7 minutes test mode).
At the conclusion of test mode, data are checked for the
manufacturer's stop test criteria.
If data do not meet the criteria, testing must continue.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from last 1 hour, 7 minutes of
test period data.
There must be no dispensing or delivery during test. |
Temperature
|
Average
for product is determined by a resistance temperature
detector (RTD).
|
Groundwater
|
Depth
to groundwater in tank excavation backfill must be determined.
If groundwater is above bottom of tank, product level
must be adjusted to provide a minimum net pressure of
1 psi at bottom of tank during test. If this cannot be
accomplished, then the tank cannot be tested using this
system.
|
Calibration
|
Load
cell must be calibrated in accordance with manufacturer's
instructions before each use.
|
Comments
|
Not
evaluated using manifolded tank systems.
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.
|
Estabrook
EZY CHEK Systems
1505
Woodside Ave.
Essexville,
MI 48732
Tel: (989) 891-9868
E-mail: sales@ezychek.com
URL: www.ezychek.com |
Evaluator: W. A. Kibbe and Associates
Tel: (517) 797-2425
Date
of Evaluation: 06/25/90
|
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