For each ship in the berthing plan and for each berth,
sum the head losses due to flow and compare this sum with the
ship deck discharge pressure using Equation 13.
EQUATION (IP):
[Hm+Hr+Hl+Hlm+Hh+(Hp-Hs)]k < Pd
(13)
or
EQUATION (SI):
[Hm+Hr+Hl+Hlm+Hh+(Hp-Hs)] < Pd
where
Hm and Hl
=
head loss in pier main and lateral,
respectively, ft (kPa)
Hr, Hh, Hlm
=
head loss in pier riser, ship's
connecting hose, and lateral to main
connection, respectively, ft (kPa)
(Hp-Hs)
=
elevation difference between pier
riser, Hp, and ship's deck riser, Hs,
ft (kPa). See Figure 11 for
schematic
k
=
0.445 psig/ft
Pd
=
ship's deck riser discharge pressure,
psig (kPa) (see Table 11)
If the inequality is not satisfied for a ship at any
berth, reiterate the calculations first for an assumed larger
main diameter and then for a larger main and lateral diameter
(if necessary).
3.8.5
Pump Stations
a) Design. Design pump stations to handle the
cumulative Qmain for piers served assuming that individual pier
main flows occur simultaneously. Package pump stations are
acceptable for oily wastes if the following are considered:
(1) Wet Well Liner. A protective rubberized liner
or alternative protective coating should be provided to resist
oil and grease and saltwater attack.
(2) Ventilation. Provide continuous ventilation
with complete air changeover every 2 minutes.
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