22
2. To determine lower tube distance from tank
bottom to bottom of cut:
Subtract valve length (W) from distance to tank
bottom (B)
(V) = (B) – (W) = _____________
Note: Lower tube clearance must meet tank manufac-
turer requirements and all AHJ, local, state, and national
codes. Typical clearance is about 4”. If lower tube clear-
ance is not met valve must be removed and adjusted to
meet these requirements.
3. To determine lower tube distance from tank
bottom to top of cut:
Subtract valve length (U) from distance to tank
bottom (B)
(T) = (B) – (U) = _____________
Note: Lower tube distance from tank bottom to top of
cut must meet all AHJ, local, state, and national codes.
For reference per 40 CFR 63 subpart CCCCCC / NESHAP
the lower tube can be no more than 6” from the bottom
of the tank. If lower tube distance is not met valve must
be removed and adjusted to meet these requirements.
4. To determine oat alignment:
Looking into upper tube (see gure) the oat should be
aligned along the length of the tank. If oat is not
aligned properly adjustments need to be made.
View into drop tube from above
Cast lug
in 71SO
body
Float direction
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