MIL-HDBK-1005/16
Section 4:
NAVY WASTEWATER COLLECTION AND TRANSMISSION SYSTEMS
4.
4.1
Introduction. Design information on wastewater
collection and transmission systems is extensively covered in WEF
MOP FD-5. This section addresses two wastewater collection and
transmission topics that are not addressed in MOP FD-5: pier and
wharf systems and drydock facilities.
4.2
Pier and Wharf Systems. Design the ship sewage
collection system on piers or on shore for the peak flow from the
maximum planned berthing with the sewer flowing full.
4.2.1
Layout/Location. Use a pressure manifold connected to
the gravity sewer by a single 4-inch (100-mm) diameter pipe for
the collection system at each berth. The manifold should have
four single 4-inch (100-mm) receiving connections spaced 150 feet
(46 meters [m]) apart on a 4-inch (100-mm) diameter pressure
sewer (see Figure 1). This layout has the following advantages:
a)
It provides large reduction in peak flows by
combining multiple discharges from a ship or nested ships into a
single stream, thereby increasing the head on the ship's pumps.
b)
By reducing peak flow, it allows berthing of other
ship types (other than those shown on the design berthing plan)
at the berth.
c)
It is self-regulating and self-cleaning, and it
avoids failure or maintenance problems inherent in regulating
valves or other devices.
To prevent pumping from one berth into another and to
allow ships with lower head pumps to discharge into the pier
sewer, each berthing space must be isolated. Isolate the berths
by providing one separate manifold at each berth connected to the
gravity pier sewer. Where the berthing space is less than
600 feet (183 m), the number of outlets should be reduced to fit
the space available. In such cases, it may be necessary to
reduce the 150-foot (46-m) spacing between outlets. For carrier
berths, two standard 4-inch (100-mm) manifolds, each with four
4-inch (100-mm) outlets, should be used. See Figure 2 for
typical collection sewer layouts on different pier types.
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