667BD Murena DELTA II
The 667BD was primarily developed to increase the number of missiles on strategic submarines. Its development was approved in June 1972 under the direction of the Rubin Central Design Bureau for Marine Engineering. The 667B Delta I served as the basis for the main design features. The pressure hull was lengthened by 16 meters in the area of the fourth and fifth compartments where four additional missile tubes were located. The displacement increased in 1,500 tons, and the full speed decreased 1 knot.
The 667BD submarines are equipped with the D-9D launch system and 16 R-29DD missiles. During the development of the new ballistic missile submarine several measures were applied to decrease the radiated noise level. The steam turbines include a two-spool system of shock-absorbers, the pipelines and hydraulic devices are isolated from the hulls and a new hydroacoustic coating was applied.
The first 667BD entered the Navy on 30 September 1975. Between 1973 and 1975 four submarines of this project were constructed at the Northern machine-building enterprise in Severodvinsk. The 667BD submarines formed part of the 3rd flotilla of submarines of the Northern fleet based in the Yagyelnaya bay.
Upgraded ships were built on previous work cycle of the project, with the preservation of the former standard equipment, since there was a large production groundwork for boats 667B project Moray. This led to a minimum of structural changes to the new project.
To accommodate the additional number of missiles in the hull in the area of the 4 and 5 compartments, it was decided "embed" additional section length of 16 m, keeping the remaining elements of the vehicle design unchanged. As a result, the number of watertight compartments durable housing increased from 10 to 11 (add additional rocket section 5 bis). The ship's tonnage increased by 1,500 tons, and the speed decreased by 1 knot. The power of the main propulsion of the submarine was increased from 52,000 to 55,000 hp
A series of measures to further reduce the noise of the submarine were implemented, as well as reducing interference to their own sonar equipment. In particular, the mechanisms of steam turbine plant was mounted on special vibration-absorbing foundations equipped with two-stage damping system. New sound-absorbing vibration damping coating were applied. Pipelines and hydraulic devices were separated from the hull by vibration isolation.
Instead of the combat information management system "Cloud" a somewhat more advanced CICS "Almaz" was installed on the ship. On the boat project "667BD Murena-M" was the first applied electrochemical regeneration air system (ERV-M) by electrolysis of water (for oxygen) and carbon dioxide absorption regenerable solid absorber. Other more advanced technical means to maintain specified standards of habitability on board the ship were introduced.
The increased range missile launch areas shifted combat patrol of the new SSBNs in the Arctic regions. As a result, there were additional measures to improve the conditions of submarine navigation in ice. In particular, the horizontal rudders were mounted to pivot to facilitate the ascent of ice polynyas - they unfolded at 90°. The submarine received an automated ship's television system that provides under-ice observation, visualization of spatial position of the ship. Displays were installed in the main command post pictures near surface and air situation according to the periscope.
On the submarine project 667BD the D-9 missile complex was replaced by an improved D-9D with missiles R-29D (adopted in 1978, Western designation SS-N-8 Mod 2 Sawfly), had an increased range (9100 km) and precision (CEP - 900 m). Since the fire control system has remained virtually unchanged, SSBN 667BD could release its missile ammunition for two volleys - basic (12 missiles) and additional (four missiles), which increased the vulnerability of the boat, before disclosing the ship's location to the opponent after the first volley.
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