12 May 2003
Including change 1, 19 January 2007
Permanent Pier Loads and Industrial Power. Other electrical
requirements such as pier lighting, receptacles, weight-handling equipment and
industrial power must be supplied from dedicated 480Y/277 Volt transformers.
Industrial power is defined as power specifically for equipment utilized for the repair and
overhaul of ships at berth and is normally only required in naval shipyards. Do not
provide permanent pier load power or industrial power from the same transformers
providing shore to ship hotel power.
Location and Arrangement of Equipment. Final locations of equipment
must be made on a pier-by-pier basis in concurrence with the Activity and the cognizant
NAVFAC EFD/EFA OR USACE DISTRICT. Selection must be coordinated with the pier
design type, other pier utilities and the pier's operational requirements. In general,
provide as much clear space for cranes and vehicular traffic on the pier deck as
possible. Examples of pier equipment arrangements are shown in Figure 3-18.
Substations. The three main types of arrangements for substations are
discussed in the following subparagraphs with an example of their use, where
Double-deck Piers. On a double-deck pier, the upper deck is used for
conventional pier functions while the lower deck serves utility systems and utility
connections. The electrical service for a double deck pier should be a permanent
service. The substations should be located on the lower deck and may be
symmetrically arranged around the pier centerline. Cross sections of a double-deck pier
are shown in Figure 2-2.
One recent example of substation arrangement and power distribution
system is Pier 6 at the Norfolk Naval Base (NNB). It consists of two electrical service
clusters with each service cluster consisting of four 4,000 kVA unit substations, totaling
32 mVA. The output of these substations serves fixed low voltage outlet assemblies.
These outlets are defined on the Pier 6 project drawings as "shore power stations"
(SPS). Each SPS contains 12 sets of three, single pole, low voltage cable connectors
(36 connectors total) that in turn serve the shore-to-ship service cables. Illustrations of
the electrical system for the NNB double-deck Pier 6 are shown in figure D-1. Pier 6
was designed as a general berthing pier to support all ship classes except SSN and
CVN, and may not be directly applicable for double-deck SSN and CVN piers or piers
designed for specific ships. See paragraph entitled "Connectors" for additional
information on the various types of connectors currently being used.