12 May 2003
Including change 1, 19 January 2007
Pier and Wharf Systems. Design the ship sewage collection system for
the peak flow from the maximum planned berthing with sewer flowing full. Base the
design on maximum discharge of ship pumps. Provide a gravity flow system unless
Layout/Location. See Figure 3-9. Provide a single 101.6 mm (4-in)
pressure rated manifold assembly at each berth. Each manifold assembly should have
four single 101.6 mm (4-in) diameter pressure sewer connectors. This layout has the
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.
By reducing peak flow, it allows berthing of other ship types included in the
It is self-regulating and self-cleaning plus avoids failure or maintenance
problems inherent in regulating valves or other similar devices.
Additional Requirements. See Figure 3-10 for typical collection sewer
layouts on different pier types. Properly isolate each berthing space in order to prevent
pumping from one berth into another and to allow ships with lower head pumps to
discharge into the pier sewer.
Isolate the berths by providing one separate manifold assembly at each
berth and then connect the manifold assembly directly to the pier's gravity sewer
system. Where the berthing space is less than 183 m (600 ft), the number of manifold
assemblies should be reduced to fit the space available. In such cases, it may be
necessary to reduce the 46 m (150 ft) spacing between the assemblies. For carrier
berths, two standard manifold assemblies each with four 101.6 mm (4-in) outlet
connectors should be provided.