Issue Date: July 14, 2003

Dresser Wayne Europe

TIG 5000 0.2 gph Precision Test and Quick Test
(Q0400-4xx Magnetostrictive Probe)

AUTOMATIC TANK GAUGING METHOD

Certification Leak rate of 0.2 gph with PD = 99.1% and PFA = 0.9% for Precision Test.
Leak rate of 0.2 gph with PD = 95.4% and PFA = 4.6% for Quick Test.
Leak Threshold 0.1 gph.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4.
Tank Capacity Maximum of 15,000 gallons. Tanks less than 95% full may be tested. Minimum product level required based on tank diameter as follows:
48" dia/min 8.5"; 
64" dia/min 10.5"; 
72" dia/min 11.5"; 
96" dia/min 14";
126" dia/min 18". 
For other tank diameters, see evaluation report.
Waiting Time Between delivery and testing ranges from 1 to 6 hours depending on tank conditions. 
None between dispensing and testing. 
There must be no delivery during waiting time.
Test Period Average of 2 hours, 46 minutes during Precision Test evaluation. 
Average of 1 hour, 9 minutes during Quick Test evaluation. 
Test data are acquired and recorded by a microprocessor which automatically determines test time based on tank size and product level. 
There must be no dispensing or delivery during test.
Temperature Probe contains 5 resistance temperature detectors (RTDs) to monitor average product temperature. 
At least one RTD must be submerged in product during test.
Water Sensor Must be used to detect water ingress. 
Minimum detectable water level in the tank is 0.66 inches. 
Minimum detectable change in water level is 0.039 inches.
Calibration RTDs and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions.
Comments Not evaluated using manifolded tank systems. Therefore, this certification is only applicable when there is a probe used in each tank and the siphon is broken during testing. 
Tests only the portion of tank containing product. 
As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure). 
Consistent testing at low levels could allow a leak to remain undetected. 
EPA leak detection regulations require testing of the portion of the tank which routinely contains product.

 

Dresser Wayne AB       

Evaluator:  Ken Wilcox Associates

Limhamnsvagen 109, Box 30049

Tel:  (816) 443-2494

SE-200 61 Malmo, Sweden

Dates of Evaluation:  12/23/93, 06/20/94

Tel:  Unavailable

08/17/95, 07/28/97, 11/17/99

 

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