Issue
Date: September 11, 1998
HT
Technologies, Inc.
Vakumatik
Models V 60, V 70 Ex
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 liquid enters interstitial space and vacuum
decreases (pressure increases) above 34 millibars.
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Applicability
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Gasoline,
diesel.
Other liquids may be tested, which are compatible with
flexible liner, after consultation with the manufacturer.
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Tank
Capacity
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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.
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Waiting
Time
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None
between delivery and testing.
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Test
Period
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Minimum
of 120 hours.
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Comments
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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.
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HT
Technologies
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Evaluator: Ken Wilcox Associates
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4360
Brownsboro Rd.
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Tel: (816) 443-2494
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Louisville,
KY 40207
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Dates
of Evaluation: 08/17/97, 01/28/98
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Tel: (888) 287-9595
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