12 May 2003
Including change 1, 19 January 2007
Metering. Unless instructed otherwise, specify the following to monitor
the system: (1) accumulating flow meter; (2) elapsed time meter for pumps and
ventilator; and (3) pump suction and discharge pressure gages. Provide gages with oil-
filled diaphragm and cutoff valves. Consult with the cognizant NAVFAC EFD/EFA OR
USACE DISTRICT for any additional requirements. See paragraph 2-5 for additional
Introduction. Design information on wastewater collection and
transmission systems is extensively covered in Water Environment Federation (WEF)
MOP FD-5, Gravity Sanitary Sewer Design and Construction. This section addresses
two wastewater collection and transmission topics that are not addressed in WEF MOP
FD-5: (1) pier and wharf facilities; and (2) drydock facilities.
Specialized Shipboard Sewage Characteristics and Parameters.
Designing sewage collection systems for shipboard wastewater requires special and
unique conditions that the designer must take into account. All of these special issues
must be addressed and resolved.
Characteristics of Ship Holding Tank Discharges. Ship holding tank
discharges can be a major source of wastewater. These wastewaters have the following
A ship's wastewater is primarily domestic wastewater but may also contain
industrial wastewater depending on the ship operations.
A ship's wastewater is more concentrated than typical domestic
wastewater, a result of specific design features of the ship's wastewater
A ship's wastewater may contain high concentrations of dissolved solids,
chloride, sulfates, and sodium if seawater flushing or ballast systems are
Ship Discharge Values. APPENDIX C defines the maximum sewage
discharge values of a ship's complement, daily flow, maximum discharge, number of
pumping stations, total number of pumps, and number and location of discharge
connections. Where destroyers or submarines are nested next to a tender berthed at a
pier, the nested ships will discharge into the tender. The tender will then discharge to
the pier's sewage collection system at the rate listed for the tender. For nested ships, it
is suggested to provide a pressure manifold to reduce peak demand flow.
Flow Rate Variations. Domestic wastewater flows at piers, wharves and
drydocks can be expected to exhibit seasonal and other weather-influenced flow
variations. In addition, the effect of industrial and ship discharge flows as well as the
variable nature of military operations may significantly affect flow variations. To