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.
102 Basile Road
Scott, LA 70583
Tel: (337) 896-8230 - Evaluator: Ken Wilcox Associates, Inc.
Tel: (816) 443-2494
Date of Evaluation: 02/21/05
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