UFC 4-151-10
10 September 2001
determine the appropriate anode configuration and cathodic protection
system requirements.
5-3.4
Efficacy. In general, the rate of corrosion loss below MLW is two-thirds to
one-half the rate just below, at, and above MLW. Since cathodic protection is effective
only below MLLW, it follows that cathodic protection should be accompanied by use of a
concrete fascia or encasement to and below MLLW. Therefore, the obvious cost
comparison is between such a composite system and complete concrete encapsulation.
5-3.5
anodes, and general repair of damage to wires and hangers in the economic analysis.
5-3.6
fully or partially inoperative due to a lack of maintenance and repair is all too common.
Implement regularly scheduled maintenance inspections to minimize risk of failure of the
cathodic protection system.
5-4
EXPANSION, CONTRACTION, AND CONTROL JOINTS
5-4.1
Open-Pile Platforms. For open-pile pier and wharf platforms, refer to
5-4.2
Bulkheads. In normal practice, no expansion or contraction joints are
provided in the sheeting regardless of type. Assuming that a concrete cap will effectively
grip the sheeting, there is no rational reason to joint the cap either as it is not free to strain
axially anywhere along its length. Similarly, no special joints are required for timber or
steel caps or for any anchor wall.
5-4.3
Concrete Quaywalls. Provide joints every 90 to 120 m (300 to 400 ft).
Such formed joints need not be carried more than 1.52 m (5 ft) below MLLW.
5-5
MISCELLANEOUS REQUIREMENTS
5-5.1
Protective Lighting. Evaluate the need for protective lighting in the
following areas. Once lighting has been determined to be necessary, install lighting levels
for Navy projects as specified in OPNAVINST 5510.45B, U.S. Naval Physical Security
Manual for:
Land approaches to piers and docks.
Water approaches to piers and docks.
Decks of open piers.
Underside of platform decks of piers and wharves, including trestles.
5-4
Previous Page
