This chapter summarizes current halon 1301 ship and aircraft installations and the Navy's investment in halon systems, discusses systems planned for new-design ships and aircraft, assesses the current and projected status of the Navy's halon inventory, and finally, examines the potential for retrofit of non-halon systems into existing platform designs. The chapter closes with the committee's findings and recommendation on Navy-specific management issues. Halon systems in shore facilities were not considered by the committee since these do not fall into the mission-critical category and are to be replaced by the year 2000. Appendix A takes a brief historical look at the introduction of halon fire extinguishing systems in the Navy and discusses in some detail the Navy's need for and use of extinguishing systems currently installed aboard ships and aircraft.
Table 4.1 lists all halon 1301-equipped ships in commission today as well as those current designs with units yet to be built. It can be seen that some 1.4 million pounds of halon are now installed, with 441,000 pounds scheduled for commitment to new-construction vessels in the future.
A review of the decommissioning schedule shows that few ships will be removed from active service for the next 15 to 20 years. Beginning in 2015, however, the pace of decommissioning picks up and, by 2025, over 50% of the currently installed halon systems will have been taken out of service, with the largest contributors to this halon reduction being LPD-4 class amphibious ships, FFG-7 class frigates, DD-963 destroyers, and the remaining fossil-fueled aircraft carriers.
Looking at the halon 1301-equipped ships yet to be built, the DDG-51 class Aegis destroyers appear to warrant special attention. Thirty-seven of these vessels are scheduled to be built in the future, with construction phased by blocks or "flights" in which accumulated design changes are incorporated. The 37 ships will each require 8995 pounds of agent for a total of 332,815 pounds of installed halon 1301.
Not shown in Table 4.1 are. ships of the Military Sealift Command (MSC). As of August 1996, MSC operated 46 ships incorporating 331 halon 1301 systems containing 509,000 pounds of agent. The committee understands that MSC vessels fall outside the normal purview of the Office of Naval Research and the Naval Sea Systems Command, and therefore, details of installations and MSC's plans for the future were not considered during the course of the study.
The committee inquired into the investment the Navy has made to date in halon 1301 installations in the current fleet. Taking the mix of ship sizes in the various classes, NavSea engineers calculated that the average cost for an individual system in today's dollars is about $300,000. Installation of piping, bottles, and control equipment accounts for $275,000, with the remaining $25,000 being the cost of hardware and agent. Multiplying this average cost by the total number of systems listed in Table 4.1 yields an investment of $665 million. And if new-construction plans are executed as now planned and shown in the table, this figure will grow by another $166 million to an investment totaling $831 million. To make the investment picture complete, the cost of RDT&E would have to be added, but this information was not available to the committee.
The Navy is shifting to non-halon systems in its next-generation, new-design ships. These include the LPD-17 amphibious ship class, the next aircraft carrier (CVN-76), and a proposed new surface combatant class (SC-21) that will follow the DDG-51 production run.