Issue Date: April 18, 1997
Revision Date: September 11, 1998
VIGILANT Leak Detection System
CONTINUOUS INTERSTITIAL TANK
SYSTEM MONITORING METHOD (PRESSURE/VACUUM)
||Leak rate of 0.1
gph with PD = 100% and PFA = 0%.
when changes in interstitial vacuum exceed a predetermined change in slope
versus time curve.
aviation fuel, fuel oil #4, waste oil.
||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.
||Minimum of 20
minutes between delivery and testing.
||Minimum of 40
||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
Interstitial space is tested continuously.
System allows for permeation of vapor from stored substance into
Vapor discharged from vacuum pump must meet applicable air quality
Vapor recovery of product vapor from interstitial space is feasible when
System detects breaches in either flexible internal liner or rigid tank
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
Bell Avon, Inc.
Ken Wilcox Associates
1200 Martin Luther King,
Tel: (816) 443-2494
Picayune, MS 39466-5427
Date of Evaluation:
Tel: (601) 799-1217