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Issue Date: April 28, 2005
MassTech
International, Ltd.
MassTech 2
Wet Test
(Mass Based)
VOLUMETRIC TANK TIGHTNESS
TEST METHOD (Underfill)
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Certification |
Leak rate of 0.1 gph
with PD > 100% and PFA < 0%. |
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Leak Threshold |
0.05 gph |
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Applicability |
Gasoline, diesel, aviation fuel, fuel oil #4, waste oil.
Ullage
portion of the tank must be tested using an ullage test method. |
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Tank Capacity |
Maximum product volume
of 30,000 gallons with ullage volume greater than 5% of total tank volume. |
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Waiting Time |
Minimum of 15 minutes. |
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Test Period |
Minimum of 30 minutes.
Test data is acquired by computer and forwarded electronically to an
analysis center where proprietary software is used to assist in the
determination of the tank condition.
Atmospheric
conditions should not be subject to violent change during data collection
process. |
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Temperature |
System measures product mass (which is not affected by
temperature) instead of product volume.
The
temperature of added product should not differ more than 9.9 degrees
Fahrenheit from that already in the tank to minimize ullage or product
expansion or contraction due to temperature fluctuation. |
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Groundwater |
If
groundwater is above tank bottom or if depth to groundwater is not
determined, the test must be conducted at two different ullage pressures
(nominal 1.5 psi difference) to eliminate leak masking. |
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Comments |
A well point or
observation well in the tank excavation backfill may help determine backfill
material, water level in tank excavation backfill, and free product.
Operators must be trained and certified by the manufacturer. |
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MassTech
International, Ltd. |
Evaluator: Ken Wilcox
Associates, Inc. |
|
102 Basile Road |
Tel: (816) 443-2494 |
|
Scott, LA 70583 |
Date of Evaluation:
11/26/04 |
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Tel: (337) 896-8230 |
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E-mail: masstech1@compuserve.com |
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URL:
http://masstechinternational.com |
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