Issue Date: September 11, 1998

HT Technologies, Inc.

Vakumatik Models V 60, V 70 Ex

Continuous Interstitial Tank System Monitoring Method (Pressure/Vacuum)

Certification Leak rate of 0.1 gph with PD =100% and PFA =0%.
Leak Threshold System alarms when liquid enters interstitial space and vacuum decreases (pressure increases) above 34 millibars.
Applicability Gasoline, diesel.
Other liquids may be tested, which are compatible with flexible liner, after consultation with the manufacturer.
Tank Capacity Maximum of 20,000 gallons based on interstitial volume resulting when flexible liner is properly fitted and held in position against rigid tank wall. No minimum product level during test.
Waiting Time None between delivery and testing.
Test Period Minimum of 120 hours.
Comments

System tests the interstitial space between a properly fitted and installed flexible liner inside a rigid tank, or between the rigid walls of a double-walled tank.
Flexible liner is held in position by maintaining a vacuum on interstitial space. Interstitial space is tested continuously.
System allows for permeation of vapor from stored substance into interstitial space.
Vapor discharged from vacuum pump must meet applicable air quality standards.
System detects breaches in either flexible internal liner or rigid tank walls.
Reasonable temperature variations will not cause an alarm or missed detection.
This system may not be compatible with all secondarily contained tanks and/or piping. Always consult with the tank and/or piping manufacturer and the manufacturer's applicable recommended installation practices before installing this system, or damage may be caused to the tank or piping by its use.

State Waterboard staff are currently evaluating the applicability of this method in satisfying the performance standards for continuous vacuum/pressure monitoring systems required by Assembly Bill 2481 (Chapter 6.7, Health and Safety Code, section 25290.1). Listings will be updated once a determination has been made.
  • HT Technologies
    4360 Brownsboro Rd.
    Louisville, KY 40207
    Tel: (888) 287-9595
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Dates of Evaluation: 08/17/97, 01/28/98

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