FFS-1072 Forecourt Guide 2025 2 - Flipbook - Page 20
DEFENDER SERIES® OVERFILL PREVENTION VALVE:
DROP TUBE LENGTHS
DEFENDER SPILL CONTAINMENT (REF.)
TOP OF RISER
“X”
TOP OF TANK
“X”
UPPER DROP TUBE
95% TANK VOLUME
OVERFILL PREVENTION VALVE
“A”
(U.S.T)
LOWER DROP TUBE
“B”
“Y”
“Y”
6” (152 MM) MAX*
BOTTOM OF TANK
* IF LOCAL CODES REQUIRE THIS DISTANCE TO
BE SMALL, SUBTRACT LESS THAN 6" (152 MM)
TO FIND 95% TANK VOLUME AND
MEASUREMENT FROM TANK CHART
ACTUAL TANK CAPACITY
TO FIND UPPER DROP TUBE LENGTH "X"
GALLONS
TOP OF RISER TO
BOTTOM OF TANK
"A"
-
X
(SUBTRACT)
-
(SUBTRACT)
=
(EQUALS)
GALLONS
(95% TANK VOLUME)
TO FIND LOWER DROP TUBE LENGTH "Y"
2.5" (63.6 MM)
95% VOLUME
HEIGHT
"B"
-
(SUBTRACT)
-
(SUBTRACT)
=
(EQUALS)
95% VOLUME
HEIGHT
"B"
.95
=
NOT TO SCALE
15.75" (400 MM)
POSITION AND
MOUNTING ADJUSTMENT
OPV LENGTH
OFFSET
TANK BOTTOME
CLEARANCE
95% VOLUME HEIGHT
=B
"X"
"X"
UPPER DROP TANK LENGTH
LOWER DROP TANK LENGTH
