Franklin Fueling Systems Tank Sentinel (TS-1001, 2001, 504, 508 & 750) Installation - Manual (Page 22)

RISER PIPES & MANHOLES Page 2 - 3 2
Maximum Riser Length
Take the distance from grade level to the top of the tank, and then subtract 6
inches (152.4 mm) — which is the minimum riser top to grade distance. See the
Example maximum riser length calculation (below):
Grade to top of tank 36" (914.4 mm)
Minimum riser to grade – 6" (152.4 mm)
Maximum Riser Length = 30" (762 mm)
Figure 2-1. Typical Level Probe – Riser Pipe & Manhole
A problem exists if the maximum riser length is less than the minimum calculated
riser length. This may be the result of an incorrect calculation, an inappropriate
choice of probe for the tank diameter, or insufficient burial depth.
It is recommended that the top of the riser be no more that 18 inches (457 mm)
maximum below grade level to provide easy access for service.
14 INCH (356 mm) MINIMUM
DIAMETER MANHOLE COVER
NOTE:
INCREASE THE 18" (457 mm) MINIMUM DIMENSION
IF THE PROBE LENGTH IS OVER-LENGTH FOR
THE TANK. ALSO SEE SECTIONS 3, 5, & 6.
COMPRESSION
GLAND FITTING
ISOLATION BUSHING
(MAY BE REQUIRED
WITH STEEL TANK)
1/2" (12.7 mm)
OR 3/4" (19.1 mm)
CONDUIT
EYS SEAL FITTING
EXCESS CABLE
"COILED-UP"
WEATHERPROOF
JUNCTION BOX
2.75 REF.
(69.8 mm)
FILL
MATERIAL 18.0"
(457 mm)
MIN.
SEE
NOTE
BELOW
4.0" RISER PIPE
ANSI SCH 40
or
DN115
BSP 4-11
TOP OF TANK
6.0" TO 18"
152 mm TO 457 mm
MANHOLE
CONCRETE SLAB
(TYPICAL)
PER NFPA30
(GRADE LEVEL)
NOTE
Hint