Issue Date: January 11, 2001 

Ronan Engineering Co.

X76CTM Series Monitoring System with:
(Series 7100 Magnetostrictive Probe, X76MP Series Magnetostrictive Probe)

AUTOMATIC TANK GAUGING METHOD

Certification Leak rate of 0.2 gph with PD = 99.9% and PFA = 0.1% for Precision Test with either probe. 
Leak rate of 0.2 gph with PD = 99.2% and PFA = 0.1% for Quick Test with Series 7100 Probe. 
Leak rate of 0.2 gph with PD = 99.6% and PFA = 0.1% for Quick Test with X76MP Series Probe. 
Leak rate of 0.1 gph with PD = 95.1% and PFA = 4.9% for 0.1gph Test with Series 7100 Probe. 
Leak rate of 0.1 gph with PD = 95.1% and PFA = 1.8% for 0.1gph Test with X76MP Series Probe.
Leak Threshold 0.1 gph for leak rate of 0.2 gph, Precision Test with Series 7100 Probe. 
0.115 gph for leak rate of 0.2 gph, Precision Test with X76MP Series Probe. 
0.115 gph for leak rate of 0.2 gph, Quick Test with Series 7100 Probe. 
0.129 gph for leak rate of 0.2 gph, Quick Test with X76MP Series Probe. 
0.05 gph for leak rate of 0.1 gph, 0.1gph Test with Series 7100 Probe. 
0.066 gph for leak rate of 0.1 gph, 0.1gph Test with X76MP Series Probe. 
A tank system should not be declared tight if the test result indicates a loss that equals or exceeds this threshold.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4. 
Tank Capacity Maximum of 20,000 gallons. 
Tanks less than 95% full may be tested. 
Minimum product level required based on test mode as follows:
For Quick Test with either probe, Precision Test with Series 7100 Probe, and 0.1gph Test with X76MP Series Probe, the minimum product level is computed as probe length divided by 6 plus 5 inches. 
For Precision Test with X76MP Series Probe and 0.1 gph Test with Series 7100 Probe, the minimum product level is 50% of tank capacity.
Waiting Time Minimum of 1 hour between delivery and testing for Quick Test. 
Minimum of 6 hours between delivery and testing for Precision Test and 0.1 gph Test. 
There must be no delivery during waiting time.
Test Period Minimum of 2 hours for all tests. 
Test data are acquired and recorded by system's computer. Leak rate is calculated from data determined to be statistically valid. 
There must be no dispensing or delivery during test.
Temperature Average for product is determined by a probe with 5 thermistors. 
At least one thermistor must be submerged in product during test.
Water Sensor Must be used to detect water ingress. 
Minimum detectable water level in the tank is 0.661 inch. 
Minimum detectable water level change is 0.011 inch. 
System is default programmed to report a water depth only when it exceeds 3.5 inches. 
System can be programmed to report a water depth of 0.661 inch and above.
Calibration System 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 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 system which routinely contains product.

 

Ronan Engineering Co.

Evaluator:  Ken Wilcox Associates

21200 Oxnard St.

Tel:  (816) 443-2494

Woodland Hills, CA  91367

Date of Evaluation:  08/15/99

Tel: (800) 327-6626

 

 

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