Issue Date: April 18, 1997
Revision Date: September 11, 1998

Bell Avon, Inc.

VIGILANT Leak Detection System

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 changes in interstitial vacuum exceed a predetermined change in slope versus time curve.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4, waste oil.
Other liquids may be tested which are compatible with flexible liner after consultation with the manufacturer.
Tank Capacity Maximum of 15,000 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 Minimum of 20 minutes between delivery and testing.
Test Period Minimum of 40 minutes.
Comments

System is located within the interstitial space between a properly fitted and installed flexible liner inside a rigid 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.
Vapor recovery of product vapor from interstitial space is feasible when required.
System detects breaches in either flexible internal liner or rigid tank walls.
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.
  • Bell Avon, Inc.
    1200 Martin Luther King, Jr. Blvd.
    Picayune, MS 39466-5427
    Tel: (601) 799-1217
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Date of Evaluation: 11/16/95

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