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Issue Date: November 22, 1995
Revision Date: January 12, 2015
Triangle
Manufacturing, Inc.
TEI System
5000, Version 1.0, Version 1.0W
NON-VOLUMETRIC TANK TIGHTNESS
TEST METHOD (VACUUM)
| Certification |
Leak rate of 0.1
gph with PD = 100% and PFA = 0%. |
| Leak
Threshold |
A tank system
should not be declared tight when the acoustic noise level of the tank
under vacuum is greater than the calibrated background acoustic noise
level (prior to evacuation).
A tank system should not be declared tight if any water ingress is
detected. |
| Applicability |
Gasoline, diesel,
aviation fuel, fuel oil #4, waste oil. |
| Tank
Capacity |
Maximum of 20,000
gallons.
Tank must be minimum 14% full.
Microphone should be located within 24 feet of all points within the tank. |
| Waiting
Time |
None between
delivery and testing. |
| Test
Period |
Minimum of
1 minute when groundwater is below bottom of tank.
When groundwater is above bottom of tank, Version 1.0W (includes either
Triangle TEI System 5000 Water Sensor or Estabrook EZ-3 Conductivity Water
Sensor) must be used and test period extended to ensure water ingress
detection during test.
For
Triangle TEI System 5000 Water Sensor:
Minimum of 10 minutes when using (time begins
after sensor is set up and calibrated).
For
Estabrook EZ-3 Conductivity Water Sensor:
Minimum test time must be calculated using
Estabrook EZ-3 operations manual, but cannot be less than 1 hour.
Calculation is based on tank size, groundwater elevation, and product
elevation.
There must be no dispensing
or delivery during test. |
| Test
Pressure |
Vacuum as
directed in operating instructions.
If vacuum cannot be maintained, see manufacturer's instructions. |
| Temperature |
Acoustic signal
is independent of product temperature. |
| Water
Sensors |
Version 1.0W (includes
either Triangle TEI System 5000 Water Sensor or Estabrook EZ-3 Conductivity
Water Sensor) must be used to detect water ingress.
For Triangle TEI System 5000
Water Sensor:
Minimum detectable water
level is 0.0532 inch.
Minimum detectable change in
water level is 0.00013 inch.
Minimum water level in tank
must be adjusted to at least 0.0532 inch at the sensor before starting the
test.
For Estabrook EZ-3
Conductivity Water Sensor:
Minimum detectable water
level is 0.014 inch.
Minimum detectable change in
water level is 0.0095 inch.
Minimum water level in
tank must be adjusted to at least 0.014 inch at the sensor
before starting the
test. |
| Groundwater |
Depth to
groundwater in tank excavation backfill must be determined.
Version 1.0 can only be
used when groundwater is below bottom of tank.
Version 1.0W must be used when groundwater is above bottom of tank. |
| Calibration |
Acoustic
sensor must be calibrated before each test in accordance with manufacturer's
instructions.
When using Version 1.0W,
Triangle TEI System 5000 Water Sensor or Estabrook EZ-3 Conductivity Water
Sensor must be calibrated before each test in accordance with manufacturer's
instructions. |
| Comments |
Manifolded tank
systems must be isolated prior to test.
Evaluated using unleaded gasoline.
Microphone was 24 feet away from the leak source during evaluation.
Headphones are used during test to listen for air ingress signal. Noise
signals are tape recorded rather that recording the noise levels in
decibels.
Vacuum test method may not be effective in some tank excavation backfill
(such as clay) because it may plug holes in tank.
If soil is saturated with product, air or water ingress may not be
detected by vacuum test.
A well point in tank excavation backfill may help identify presence of
this condition. |
|
Triangle Manufacturing, Inc.
|
Evaluator: United States
Testing Company
|
|
3726 Park Place
|
Tel:
(213) 723-7181
|
|
Montrose
,
CA
91020
|
Date of
Evaluation:
02/04/93
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Tel: (818) 301-7777
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Evaluator: Ken Wilcox Associates
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Tel: (816) 443-2494 |
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Date of Evaluation: 01/20/98 |
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