Issue Date: April 28, 2005
MassTech
International, Ltd.
MassTech 2
Wet Test (Mass Based)
VOLUMETRIC
TANK TIGHTNESS TEST METHOD (Underfill)
Certification
|
Leak rate of 0.1 gph with
PD > 100% and PFA < 0%.
|
Leak
Threshold
|
0.05 gph
|
Applicability
|
Gasoline,
diesel, aviation fuel, fuel oil #4, waste oil.
Tanks containing other liquids may be tested after consultation
with the manufacturer.
Ullage portion of the tank must be tested using an ullage
test method.
|
Tank
Capacity
|
Maximum product volume of
30,000 gallons with ullage volume greater than 5% of total
tank volume.
|
Waiting
Time
|
Minimum of 15 minutes.
|
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 condictions should not be subject to violent
change during data collection process.
|
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.
|
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.
|
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.
|
MassTech International, Ltd.
|
Evaluator:
Ken Wilcox Associates, Inc.
|
102
Basile Road
|
Tel:
(816) 443-2494
|
Scott,
LA 70583
|
Date
of Evaluation: 02/21/05
|
Tel:
(337) 896-8230
|
|
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