Beidiao 991

Chinese Research Ship Beidiao 991 is a research ship that has served both in civilian use and in the People's Liberation Army Navy (PLAN).[1][2][3][4] It was built in the People’s Republic of China (PRC). This ship has the NATO reporting name Kandao (Chinese: 勘岛),[5][6][7][8] meaning Surveying Island.

History
PRC
NameBeidiao 991
NamesakeNorth Investigation 991
BuilderCSIC
CommissionedApril 2008
In service2008
HomeportDalian
General characteristics
TypeMultipurpose research ship (AGE)
Displacement1,441 long tons (1,464 t)
Length64 m (210 ft 0 in)
Beam23 m (75 ft 6 in)
Installed power2800 kW
PropulsionMarine Diesel
Speed11 kt
Range1500 nm
Endurance7 days
Complement32
Electronic warfare
& decoys		None

Design

The steel-hulled Beidiao 991 adopts a Small-waterplane-area twin hull design, with a 2800 kW Integrated electric propulsion (IEP). It is the first ship with a displacement greater than one thousand tons to adopt an IEP in China.[1][2] Research activities are conducted on the 120 square meter afterdeck and the five onboard labs (two on port, two on starboard, and one at the stern).[1][2] The ship is equipped with a galley, conference room, command center, and various equipment for different scientific research missions, such as hydrographic, oceanographic, geologic and acoustic surveys.[1][2]

Initial service proved unsatisfactory: when operating in high seas. The ship suffered from excessive vibration that generated enough noise to prevent onboard scientific research equipment from working properly.[1][2] Fuel and fresh water reserves were inadequate, causing a need for frequent replenishment.[1][2]

The ship went through a major upgrade to resolve these issues,[1][2] which resulted in a Type 639 oceanographic surveillance ship that is forty percent larger with displacement reaching fifteen hundred tons.

Type NATO designation Pennant No. Name
(English)		 Name
(Chinese)		 Commissioned Displacement Fleet Status
Beidiao 991 multipurpose experimental ship (AGE)Kandao classBei-Diao 991North Investigation 991北调 991April 20081441 tNorth Sea FleetsActive

References
  1. "Chinese research ship Beidiao 991". Sohu (in Simplified Chinese). December 17, 2017.
  2. "Chinese research vessel Beidiao 991" (in Traditional Chinese). December 12, 2017.
  3. "Beidiao 991" (PDF) (in Simplified Chinese). September 15, 2017.
  4. "Beidiao 991 research ship" (in Simplified Chinese). April 16, 2021.
  5. "PLANS recognition guide 2018". July 16, 2018.
  6. "PLANS recognition guide 2019". February 19, 2020.
  7. "PLANS recognition guide 2020". February 19, 2020.
  8. "PLANS recognition guide 2015". August 7, 2015.
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