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
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Leak
rate of 0.1 gph with PD = 100% and PFA = 0%.
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Leak
Threshold
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System
alarms when changes in interstitial vacuum exceed a predetermined
change in slope versus time curve.
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Applicability
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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
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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.
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Waiting
Time
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Minimum
of 20 minutes between delivery and testing.
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Test
Period
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Minimum
of 40 minutes.
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Comments
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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.
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Bell
Avon, Inc.
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Evaluator: Ken Wilcox Associates
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1200
Martin Luther King, Jr. Blvd.
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Tel: (816) 443-2494
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Picayune,
MS 39466-5427
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Date
of Evaluation: 11/16/95
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Tel: (601) 799-1217
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