MIL-HDBK-1005/9A
Table 15 for basic design data and Figure 19 for typical plate
separator arrangement. The exact dimensions and orientation of
the separator (crossflow inclined, crossflow horizontal, and
downflow inclined) will vary with separator type and
manufacturer.
b)
Provide adequate cathodic protection.
c) Minimize hydraulic surge effect on separator by
use of variable speed pumps, flow control valves, or by an
upstream surge tank with gravity feed through an upstream
control orifice.
d)
Refer to NFGS-11311 for additional design
information.
e) Example Calculation 3 - Determination of required
number of plates. Steps are performed first using English
units, then using SI units (shown in brackets).
Determine required number of theoretical plates and
number of plate packs as follows:
Given:
(From Example Calculation 1 preceding):
LET Volume = 490,000 gal (1,854,846 L)
Assume LET contents must be processed through an induced gravity
separator in 16 hours.
Influent flow rate to separator (QI)
QI = 490,000 gal/16 h X 1 h/60 min = 510.416 gpm
[QI = 1,854,846 L/16 h X 1 h/60 min = 1932.13 L/min]
Recommended Surface Loading Rate (QSR):
200 gpd/ft2 [8149.11 L/day⋅m2]
QSR =
Convert to gpm/ft2 [L/min⋅m2]:
200 gal/day⋅ft2 X 1 day/1440 min
0.1389 gpm/ft2
=
[(8149 L/min⋅m2) X 1 day/1440 min =
5.66 L/min⋅m2
143
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