Ohio-class submarine

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Ohio-class submarine
SSBN726 Ohio.svg
Ohio-class SSBN profile
Good Luck Ohio.JPEG
USS Ohio, during her commissioning ceremony in 1981.
Class overview
NameOhio class
Builders General Dynamics Electric Boat [1]
OperatorsFlag of the United States Navy (official).svg  United States Navy [1]
Preceded by Benjamin Franklin class
Succeeded by Columbia class [2]
Cost$2 billion (late 1990s) [3] ($3.53 billion in 2023 dollars [4] )
Built1976–1997
In commission1981–present
Planned24
Completed18
Cancelled6
Active18
General characteristics
Type SSBN/SSGN (hull design SCB-304) [5]
Displacement
  • 16,764 tonnes (16,499 long tons) surfaced [1] [3]
  • 18,750 tonnes (18,450 long tons) submerged [1]
Length560 ft (170 m) [1]
Beam42 ft (13 m) [1]
Draft35.5 ft (10.8 m) maximum [6]
Propulsion
Speed
  • 12 knots (22 km/h; 14 mph) surfaced [1]
  • 20 knots (37 km/h; 23 mph) submerged (official) [1]
  • 25 knots (46 km/h; 29 mph) submerged (reported) [1]
RangeLimited only by food supplies
Test depth+800 ft (240 m) [8]
Complement15 officers, 140 enlisted [1] [3]
Sensors and
processing systems
Armament4 × 21 inch (533 mm) Mark 48 torpedo tubes (Forward Compartment 4th level)
General characteristics (SSBN-726 to SSBN-733 from construction to refueling)
Armament20 [lower-alpha 1] × Trident I C4 SLBM with up to 8 MIRVed 100 ktTNT W76 nuclear warheads each, range 4,000 nmi (7,400 km; 4,600 mi)
General characteristics (SSBN-734 and subsequent hulls upon construction, SSBN-730 to SSBN-733 since refueling)
Armament20 [lower-alpha 1] × Trident II D5 SLBM with up to 12 MIRVed W76 or W88 (475 ktTNT) nuclear warheads each, range 6,100 nmi (11,300 km; 7,000 mi)
General characteristics (SSGN conversion)
Armament22 tubes, each with 7 Tomahawk cruise missiles, totaling 154

The Ohio class of nuclear-powered submarines includes the United States Navy's 14 ballistic missile submarines (SSBNs) and its four cruise missile submarines (SSGNs). Each displacing 18,750 tons submerged, the Ohio-class boats are the largest submarines ever built for the U.S. Navy. They are also the third-largest submarines ever built, behind the Russian Navy's Soviet era 48,000-ton Typhoon class, the last of which was retired in 2023, [lower-alpha 2] [11] and 24,000-ton Borei class. [12] Capable of carrying 24 Trident II missiles apiece, the Ohio class are equipped with just as many missiles as, if not more than, either the Borei class (16) or the deactivated Typhoon class (20).

Contents

Like their predecessors the Benjamin Franklin and Lafayette-class, [13] the Ohio-class SSBNs are part of the United States' nuclear-deterrent triad, along with U.S. Air Force strategic bombers and intercontinental ballistic missiles. [14] The 14 SSBNs together carry about half of U.S. active strategic thermonuclear warheads. Although the Trident missiles have no preset targets when the submarines go on patrol, [15] : 392  they can be given targets quickly, from the United States Strategic Command based in Nebraska, [16] using secure and constant radio communications links, including very low frequency systems.

All the Ohio-class submarines, except for USS Henry M. Jackson, are named for U.S. states, which U.S. Navy tradition had previously reserved for battleships and later cruisers. The Ohio class is to be gradually replaced by the Columbia class beginning in 2031.

Description

The Ohio-class submarine was designed for extended strategic deterrent patrols. Each submarine is assigned two complete crews, called the Blue crew and the Gold crew, each typically serving 70-to-90-day deterrent patrols. To decrease the time in port for crew turnover and replenishment, three large logistics hatches have been installed to provide large-diameter resupply and repair access. These hatches allow rapid transfer of supply pallets, equipment replacement modules, and machinery components, speeding up replenishment and maintenance of the submarines. Moreover, the "stealth" ability of the submarines was significantly improved over all previous ballistic-missile subs. Ohio was virtually undetectable in her sea trials in 1982, giving the U.S. Navy extremely advanced flexibility. [17]

USS Michigan (SSBN-727) at a dry-dock in November 2002, before its conversion to an SSGN USS Michigan (SSBN-727).jpg
USS Michigan (SSBN-727) at a dry-dock in November 2002, before its conversion to an SSGN

The class's design allows the boat to operate for about 15 years between major overhauls. These submarines are reported to be as quiet at their cruising speed of 20 knots (37 km/h; 23 mph) or more as the previous Lafayette-class submarines at 6 knots (11 km/h; 6.9 mph), although exact information remains classified. [18] Fire control for their Mark 48 torpedoes is carried out by Mark 118 Mod 2 system, [9] while the Missile Fire Control system is a Mark 98. [9]

The Ohio-class submarines were constructed from sections of hull, with each four-deck section being 42 ft (13 m) in diameter. [6] [9] The sections were produced at the General Dynamics Electric Boat facility, Quonset Point, Rhode Island, and then assembled at its shipyard at Groton, Connecticut. [6]

The US Navy has a total of 18 Ohio-class submarines which consist of 14 ballistic missile submarines (SSBNs), and four cruise missile submarines (SSGNs). The SSBN submarines provide the sea-based leg of the U.S. nuclear triad. Each SSBN submarine is armed with up to 20 Trident II submarine-launched ballistic missiles (SLBM). Each SSGN is capable of carrying 154 Tomahawk cruise missiles, plus a complement of Harpoon missiles to be fired through their torpedo tubes.

History

The Ohio class was designed in the 1970s to carry the concurrently designed Trident submarine-launched ballistic missile. The first eight Ohio-class submarines were armed at first with 24 Trident I C4 SLBMs. [6] Beginning with the ninth Trident submarine, Tennessee, the remaining boats were equipped with the larger, three-stage Trident II D5 missile. [9] The Trident I missile carries eight multiple independently targetable reentry vehicles, while the Trident II missile carries 12, in total delivering more destructive power than the Trident I missile and with greater accuracy. Starting with Alaska in 2000, the Navy began converting its remaining ballistic missile submarines armed with C4 missiles to carry D5 missiles. This task was completed in mid-2008. The first eight submarines had their home ports at Bangor, Washington, to replace the submarines carrying Polaris A3 missiles that were then being decommissioned. The remaining 10 submarines originally had their home ports at Kings Bay, Georgia, replacing the Poseidon and Trident Backfit submarines of the Atlantic Fleet.

SSBN/SSGN conversions

Ohio-class SSGN profile SSGN726 Ohio.svg
Ohio-class SSGN profile
USS Ohio being converted from an SSBN to an SSGN in March 2004 OHIOSSGNCONVERSION.JPG
USS Ohio being converted from an SSBN to an SSGN in March 2004

In 1994, the Nuclear Posture Review study determined that, of the 18 Ohio SSBNs the U.S. Navy would be operating in total, 14 would be sufficient for the strategic needs of the U.S. The decision was made to convert four Ohio-class boats into SSGNs capable of conducting conventional land attack and special operations. As a result, the four oldest boats of the class—Ohio, Michigan, Florida, and Georgia—progressively entered the conversion process in late 2002 and were returned to active service by 2008. [19] The boats could thereafter carry 154 Tomahawk cruise missiles and 66 special operations personnel, among other capabilities and upgrades. [19] The cost to refit the four boats was around US$1 billion (2008 dollars) per vessel. [20] During the conversion of these four submarines to SSGNs (see below), five of the remaining submarines, Pennsylvania, Kentucky, Nebraska, Maine, and Louisiana, were transferred from Kings Bay to Bangor.[ citation needed ] Further transfers occur as the strategic weapons goals of the United States change.

Artist's concept of an Ohio-class SSGN launching Tomahawk Land Attack Missiles Ohio-class submarine launches Tomahawk Cruise missiles (artist concept).jpg
Artist's concept of an Ohio-class SSGN launching Tomahawk Land Attack Missiles

In 2011, Ohio-class submarines carried out 28 deterrent patrols. Each patrol lasts around 70 days. Four boats are on station ("hard alert") in designated patrol areas at any given time. [21] From January to June 2014, Pennsylvania carried out a 140-day-long patrol, the longest to date. [22]

The conversion modified 22 of the 24 88-inch (2.2 m) diameter Trident missile tubes to contain large vertical launch systems, one configuration of which may be a cluster of seven Tomahawk cruise missiles. In this configuration, the number of cruise missiles carried could be a maximum of 154, the equivalent of what is typically deployed in a surface battle group. Other payload possibilities include new generations of supersonic and hypersonic cruise missiles, and Submarine Launched Intermediate Range Ballistic Missiles, [23] unmanned aerial vehicles, the ADM-160 MALD, sensors for antisubmarine warfare or intelligence, surveillance, and reconnaissance missions, counter mine warfare payloads such as the AN/BLQ-11 Long Term Mine Reconnaissance System, and the broaching universal buoyant launcher and stealthy affordable capsule system specialized payload canisters.[ citation needed ]

The helm of the Ohio-class guided-missile submarine, USS Florida (SSGN-728), in March 2010 US Navy 100308-N-9588L-023 Machinist's Mate 3rd Class Joan Valles, left, mans the helm of the Ohio-class guided-missile submarine USS Florida (SSGN 728).jpg
The helm of the Ohio-class guided-missile submarine, USS Florida (SSGN-728), in March 2010

The missile tubes also have room for stowage canisters that can extend the forward deployment time for special forces. The other two Trident tubes are converted to swimmer lockout chambers. For special operations, the Dry Combat Submersible (which replaced the Advanced SEAL Delivery System), as well as the dry deck shelter, can be mounted on the lockout chamber and the boat will be able to host up to 66 special-operations sailors or Marines, such as Navy SEALs, or USMC MARSOC teams. Improved communications equipment installed during the upgrade allows the SSGNs to serve as a forward-deployed, clandestine Small Combatant Joint Command Center. [24]

On 26 September 2002, the Navy awarded General Dynamics Electric Boat a US$442.9 million contract to begin the first phase of the SSGN submarine conversion program. Those funds covered only the initial phase of conversion for the first two boats on the schedule. Advance procurement was funded at $355 million in fiscal year 2002, $825 million in the FY 2003 budget and, through the five-year defense budget plan, at $936 million in FY 2004, $505 million in FY 2005, and $170 million in FY 2006. Thus, the total cost to refit the four boats is just under $700 million per vessel.[ citation needed ]

In November 2002, Ohio entered a dry-dock, beginning her 36-month refueling and missile-conversion overhaul. Electric Boat announced on 9 January 2006 that the conversion had been completed. The converted Ohio rejoined the fleet in February 2006, followed by Florida in April 2006. The converted Michigan was delivered in November 2006. The converted Ohio went to sea for the first time in October 2007. Georgia returned to the fleet in March 2008 at Kings Bay. [25] [ failed verification ] These four SSGNs are expected to remain in service until about 2023–2026. At that point, their capabilities will be replaced with Virginia Payload Module-equipped Virginia-class submarine. [26]

Missile tube reduction

As part of the New START treaty, four tubes on each SSBN were deactivated in 2017, reducing the number of missiles to 20 per boat. [27]

Detailed cross-section

Trident-Ohio class submarine 3D drawing.svg
Line drawing of the Ohio class in its original SSBN configuration. (1) Sonar dome, (2) Main ballast tanks, (3) Computer room, (4) Integrated radio room, (5) Sonar room, (6)  Command and control center, (7) Navigation center, (8) Missile control center, (9) Engine room, (10)  Reactor compartment, (11) Auxiliary machinery room no. 2, (12) Crew's berthing, (13) Auxiliary machinery room no. 1, (14) Torpedo room, (15)  Wardroom, (16)  Chief petty officer quarters, (17) Missile compartment

List of boats

Boat Hull number OrderedLaid downLaunchedDeliveredCommissionedHomeportService life
(status)		Ref.
Guided-missile submarines (SSGN)
Ohio SSGN-7261 July 197410 April 19767 April 197928 October 198111 November 1981 Naval Base Kitsap, Washington 42 years, 5 months and 6 days
(in active service)		 [28]
Michigan SSGN-72728 February 19754 April 197726 April 198028 August 198211 September 1982Naval Base Kitsap, Washington41 years, 7 months and 6 days
(in active service)		 [29]
Florida SSGN-72828 February 197519 January 198114 November 198117 May 198318 June 1983 Naval Submarine Base Kings Bay, Georgia 40 years, 9 months and 30 days
(in active service)		 [30]
Georgia SSGN-72920 February 19767 April 19796 November 198217 January 198411 February 1984Naval Submarine Base Kings Bay, Georgia40 years, 2 months and 6 days
(in active service)		 [31]
Ballistic missile submarines (SSBN)
Henry M. Jackson
(ex Rhode Island)		SSBN-7306 June 197719 November 198115 October 198311 September 19846 October 1984Naval Base Kitsap, Washington39 years, 6 months and 11 days
(in active service)		 [32]
Alabama SSBN-73127 February 197827 August 198119 May 198423 April 198525 May 1985Naval Base Kitsap, Washington38 years, 10 months and 23 days
(in active service)		 [33]
Alaska SSBN-73227 February 19789 March 198312 January 198526 November 198525 January 1986Naval Submarine Base Kings Bay, Georgia38 years, 2 months and 23 days
(in active service)		 [34]
Nevada SSBN-7337 January 19818 August 198314 September 19857 August 198616 August 1986Naval Base Kitsap, Washington37 years, 8 months and 1 day
(in active service)		 [35]
Tennessee SSBN-7347 January 19829 June 198613 December 198618 November 198817 December 1988Naval Submarine Base Kings Bay, Georgia35 years and 4 months
(in active service)		 [36]
Pennsylvania SSBN-73529 November 19822 March 198723 April 198822 August 19899 September 1989Naval Base Kitsap, Washington34 years, 7 months and 8 days
(in active service)		 [37]
West Virginia SSBN-73621 November 198318 December 198714 October 198910 September 199020 October 1990Naval Submarine Base Kings Bay, Georgia33 years, 5 months and 28 days
(in active service)		 [38]
Kentucky SSBN-73713 August 198518 December 198711 August 199027 June 199113 July 1991Naval Base Kitsap, Washington32 years, 9 months and 4 days
(in active service)		 [39]
Maryland SSBN-73814 March 198622 April 198610 August 199131 May 199213 June 1992Naval Submarine Base Kings Bay, Georgia31 years, 10 months and 4 days
(in active service)		 [40]
Nebraska SSBN-73926 May 19876 July 198715 August 199218 June 199310 July 1993Naval Base Kitsap, Washington30 years, 9 months and 7 days
(in active service)		 [41]
Rhode Island SSBN-74015 January 198815 September 198817 July 199322 June 19949 July 1994Naval Submarine Base Kings Bay, Georgia29 years, 9 months and 8 days
(in active service)		 [42]
Maine SSBN-7415 October 19883 July 199016 July 199421 June 199529 July 1995Naval Base Kitsap, Washington28 years, 8 months and 29 days
(in active service)		 [43]
Wyoming SSBN-74218 October 19898 August 199115 July 199520 June 199613 July 1996Naval Submarine Base Kings Bay, Georgia27 years, 9 months and 4 days
(in active service)		 [44]
Louisiana SSBN-74319 December 199023 October 199227 July 199614 August 19976 September 1997Naval Base Kitsap, Washington26 years, 7 months and 11 days
(in active service)		 [45]

Note: Boats based at Naval Base Kitsap, Washington are operated by the U.S. Pacific Fleet, while boats based at Naval Submarine Base Kings Bay, Georgia are operated by U.S. Fleet Forces Command, (formerly the U.S. Atlantic Fleet).

Replacement

The U.S. Department of Defense anticipated a continued need for a sea-based strategic nuclear force. [46] The first of the current Ohio-class SSBNs was expected to be retired by 2029, [46] so the replacement submarine would need to be seaworthy by that time. A replacement was expected to cost over $4 billion per unit compared to Ohio's $2 billion. [3] The U.S. Navy explored two options. The first option was a variant of the Virginia-class nuclear-powered attack submarines. The second option was a dedicated SSBN, either with a new hull or based on an overhaul of the current Ohio-class. [47]

With the cooperation of both Electric Boat and Newport News Shipbuilding, in 2007, the U.S. Navy began a cost-control study. [46] Then in December 2008, the U.S. Navy awarded Electric Boat a contract for the missile compartment design of the Ohio-class replacement, worth up to $592 million. Newport News is expected to receive close to 4% of that project. In April 2009, U.S. Defense Secretary Robert M. Gates stated that the U.S. Navy was expected to begin such a program in 2010. [3] The new vessel was scheduled to enter the design phase by 2014. If a new hull design was to be used, the program needed to be initiated by 2016 to meet the 2029 deadline. [46] [ needs update ]

The Columbia-class was officially designated on 14 December 2016, by Secretary of the Navy Ray Mabus, and the lead submarine will be USS District of Columbia (SSBN-826). [48] The Navy wants to procure the first Columbia-class boat in FY2021, [49] though it is not expected to enter service until 2031. [50] [51]

In 2020, Navy officials first publicly discussed the idea of extending the lives of select Ohio-class boats at the Naval Submarine League's 2020 conference. During the 2022 conference, Rear Admiral Scott Pappano, the program executive officer for strategic submarines, and Rear Admiral Douglas G. Perry, the director of undersea warfare on the Chief of Naval Operations' staff, discussed the Columbia-class program, and also touched on the possibility of finding Ohio-class boats that had sufficient remaining nuclear fuel and were in good enough material state to be given a further extension to their lives. [52]

As ballistic-missile submarines, the Ohio class has occasionally been portrayed in fiction books and films.

See also

Notes

  1. 1 2 Each hull initially started out with 24 missile tubes. This number was reduced to 20 in 2017 due to the New START treaty
  2. ↑ The last boat of the Typhoon-class, Dmitriy Donskoi, was confirmed by Russia, in February 2023, as deactivated. [10]

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  14. ↑ Chinworth 2006, p. 2.
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