Non-Volumetric Tank Tightness Test Methods (Ullage)

Vendor Equipment Name Leak Rate / Threshold / Max Tank Capacity
Alert Technologies, Inc Alert Ullage System Model 1050 (Pressure and Vacuum Test) 0.1 gph/ A tank system should not be declared tight if the ratio of the ultrasonic signal (when the tank is under pressure or vacuum) to the background signal (prior to pressurization or evacuation) equals or exceeds 1.5 for either 12 kHz or 25 kHz frequency band./6,000 gallons
Alert Ullage System Model 1050 X (Vacuum Test) 0.1 gph/ A tank system should not be declared tight if the ratio of the ultrasonic signal (when the tank is under vacuum) to the background signal (prior to evacuation) equals or exceeds 1.5 for either 12 kHz or 25 kHz frequency band./24,000 gallons
Leighton O’Brien Pty. Ltd. Leighton O’Brien Dry Test (Pressure Decay Test) 0.1gph/ A tank system should not be declared tight when the pressure decay trend results in an indication of failure or inconclusive on the test apparatus screen./20,000 gallons
MassTech International, Ltd. MassTech Analog Acoustic Vacuum Method (Vacuum Test) 0.1 gph/ Tank ullage should not be declared tight when the acoustic signal characteristic of a leak is detected./20,000 gallons
MassTech 002 Ullage Test System(Pressure or Vacuum Test) 0.1 gph/Tank ullage should not be declared tight when a predetermined threshold is exceeded. This threshold may be modified by the results of the static test./30,000 gallons
MassTech Analog Remote Spectral Analysis Method (Vacuum Test) 0.1 gph/ Tank ullage should not be declared tight when the digital recording of the noise spectrum of tank under vacuum has a detectable difference from the digital recording of the noise spectrum of tank at zero pressure./20,000 gallons
ProTank, Inc. UTA-5000 Ullage Tester (Vacuum or Pressure Test) 0.1 gph/ A tank system should not be declared tight when the acoustic signal detected is different from the baseline. Baseline is the acoustic signal before tank is pressurized or evacuated./16,500 gallons
UTF-5000 Ullage Tester (Pressure Test) 0.1 gph/ A tank system should not be declared tight when the make-up gas flow rate into ullage equals or exceeds 0.275 cubic feet/hour./7,500 gallons
UTFP-5000 Ullage Tester (Pressure Test) 0.1 gph/ A tank system should not be declared tight when the pressure decay trend equals or exceeds 0.016 psi/hr./10,260 gallons
Purpora Engineering, Inc. (originally listed as Heath Consultants, Inc.) Alert 8200 Series Sonde (Ullage) 0.1 gph/ A tank system should not be declared tight if the ratio of the ultrasonic signal (when the tank is under pressure or vacuum) to the background signal (prior to pressurization or evacuation) equals or exceeds 1.5 for either 12 kHz or 25 kHz frequencey band./ 30,000 gallons
Tanknology - NDE UST Ullage Test, Version U2 (Pressure Test) 0.1 gph/ A tank system should not be declared tight when the pressure decay trend equals or exceed 0.016 psi/hr./10,260 gallons
UTS-4T Ullage Test (Pressure Test) 0.1 gph/ A tank system should not be declared tight when the make-up gas flow rate into ullage equals or exceeds 0.275 cubic feet/hour./7,500 gallons
U3 Ullage Test (Vacuum or Pressure Test)

0.1 gph/ A tank system should not be declared tight when the acoustic signal detected is different from the baseline

Baseline is the acoustic signal before tank is pressurized or evacuated./16,500 gallons
Triangle Environmental, Inc TEI Ullage Test, Version 1.0 (Vacuum Test) 0.1 gph/ A tank system should not be declared tight when an increase in the acoustic noise level (above background) of the tank under vacuum is detected due to air or water ingress./15,000 gallons
USTest, Inc. (previously listed as Sound Products Manufacturing, Inc.) UST 2000/U (Pressure and Vacuum Test) 0.1 gph/ A tank system should not be declared tight when there is a substantial increase in the acoustic noise signal (when the tank is under pressure or vacuum) above the background signal (prior to pressurization or evacuation) in the frequency interval of 10 kHz to 20 kHz./7,550 gallons (pressure test), 5,250 gallons (vacuum test).