Issue Date: September 11, 1998
February 16, 2005
Models V 60, V 70 Ex
CONTINUOUS INTERSTITIAL TANK
SYSTEM MONITORING METHOD (PRESSURE/VACUUM)
||Leak rate of 0.1
gph with PD =100% and PFA =0%.
when liquid enters interstitial space and vacuum decreases (pressure
increases) above 34 millibars.
||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.
delivery and testing.
||Minimum of 120
||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
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
Vapor discharged from vacuum pump must meet applicable air quality
System detects breaches in either flexible internal liner or rigid tank
Reasonable temperature variations will not cause an alarm or missed
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
Ken Wilcox Associates
Tel: (816) 443-2494
of Evaluation: 08/17/97,
Tel: (888) 287-9595