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Issue Date: November 22, 1995
Revision Date: January 12, 2015
Triangle
Manufacturing, Inc.
TEI System
4000, Version 1.0
VOLUMETRIC TANK TIGHTNESS TEST
METHOD (UNDERFILL)
| Certification |
Leak rate of 0.1
gph with PD = 99% and PFA = 4.8%. |
| 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,
fuel oil #4. |
| Tank
Capacity |
Maximum of 15,000
gallons.
Tank must be between 50 and 100% full. |
| Waiting
Time |
Minimum of 6
hours between delivery and testing.
There must be no dispensing or delivery during waiting time. |
| Test
Period |
Minimum is
determined by system's computer.
Average was 4 hours during the evaluation.
Leak rate is calculated from last 2 hours of test period data.
Test data are acquired and recorded by system's computer.
There must be no dispensing or delivery during test. |
| Temperature |
Average for
product is determined by a minimum of 3 thermistors. |
| 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. |
| Calibration |
Thermistors must
be calibrated before each test in accordance with manufacturer's
instructions. |
| 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.
May also be used as an overfill test method. |
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Triangle
Environmental, Inc.
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Evaluator: United States
Testing Company
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3726 Park Place
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Tel:
(213) 723-7181
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Montrose
,
CA
91020
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Date of
Evaluation: 04/02/91
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Tel: (818) 301-7777
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