Issue Date: September 14, 2018
CGRS, Inc.
iotaVision™ L005
Enhanced Leak Detection (ELD) Method
Non-Volumetric Tank Tightness Test Method (Tracer)
| Certification | Leak rate of 0.005 gph as vapor with PD = 100% and PFA = 0%. |
|---|---|
| Leak Threshold | A tank system should not be declared tight when brine is observed in the primary containment. |
| Applicability | Method tests the primary containment of newly installed secondarily contained tanks. It does not test single-wall, portions of the tank that are not exposed to the brine solution such as tank bungs and manway penetrations. The primary component of the system under test must be dry, containing no liquid, except that it may contain up to 1 inch of residual ballast water if a dyed brine solution is used. The interstice must be liquid filled. |
| Tank Capacity | Not limited by capacity. |
| Test Period | Following the pre-test waiting time, normal test duration operationally in the field is 1 minute for each 5 feet of leak point target area (up to 4 feet wide), and is less than 60 minutes for most containers. The test duration can vary depending on the condition of the tank surface. If the tank surface is clean and free of any water, the test duration could be shorter. If the inside of the tank is dirty, contains some gravel and has up to 1 inch of ballast water, it is possible that the test duration would be longer. The assessment of the tank condition is determined by the trained technician that is operating the iotaVision™ method. Once the tank condition is determined, an appropriate test duration is implemented. |
| Waiting Time | After the brine level is raised to a minimum of 3 inches above the primary tank, a minimum 30 minutes of pre-test waiting time to allow brine solution to collect in the low point of the tank where it may be visually observed. |
| Dosage | The interstice must be completely filled with colored or clear brine. |
| Sampling Points | Tank top access must be sufficient to allow the entry of the remote observation vehicle. |
| Groundwater | Groundwater level is not determined and does not impact the test. |
| Detector | Colored or colorless brine is observed visually via a remote inspection vehicle inserted into the tank. |
| Calibration | Not applicable. |
| Comments | This method allows for the detecting of the clear brine solution or a dyed brine solution ingress into the primary space of a double walled tank at any point that can be observed. When a dyed brine that has a contrasting color, when compared to the tank surface, is used to fill the interstice, there can be up to 1 inch of water present at the bottom of the tank at the beginning of the pre-soak test period. This method is mainly used to test newly installed double walled tanks that have an interstitial space that is filled with a colored brine solution. These newly installed tanks do not have product present inside the primary area of the tank. CGRS prohibits the use of this test method in a tank that has contained petroleum product at any time without specific written approval from the CGRS director of health and safety. As referenced by the California Water Resources Control Board technical letter Enhanced Leak Detection Testing for Hydrostatically Filled Underground Storage Tanks, dated September 14, 2018. |
- CGRS, Inc.
1301 Academy Court
Fort Collins, CO 80524
Tel: (800) 288-2657
URL: www.cgrs.com - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 08/17/17
Home | Vendors: A–F | Vendors: G–M | Vendors: N–S | Vendors: T–Z | Method Index
Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the performance of the method or equipment. Equipment should be installed and operated in accordance with all applicable laws and regulations. For full details, please refer to our expanded DISCLAIMER page.
