Mahidol Adulyadej Naval Dockyard

Mahidol Adulyadej Naval Dockyard is a Royal Thai Navy shipyard located in Sattahip, Chonburi, Thailand. The facility operates within Thailand's naval infrastructure and supports the construction, refitting, and return-to-service of vessels used by the Royal Thai Navy. Its name commemorates Prince Mahidol Adulyadej, who served in the Royal Siamese Navy from 1912 to 1914 and is an important figure in the history of Thailand's naval and medical institutions. The dockyard is associated with the construction of Thailand's Krabi-class offshore patrol vessels. HTMS Krabi, commissioned in 2013, was built at the yard as a modified version of the River-class patrol vessel design. A second vessel of the class, HTMS Prachuap Khiri Khan, was also constructed at Mahidol Adulyadej Naval Dockyard and entered service in 2017. These ships form part of Thailand's effort to maintain domestic capability in the construction and support of medium-sized naval patrol vessels. The yard has also performed major maintenance and modernization work on vessels acquired from abroad. HTMS Bangpakong, a Chinese-built ship, underwent refitting at the facility and returned to active service in early 2017. This work illustrates the dockyard's role not only as a builder of new ships but also as a sustainment and engineering center for the Royal Thai Navy's existing fleet. Plans have been reported for one of Thailand's submarines to be based at the dockyard. Such a role would expand the facility's importance within Thailand's naval operating network, although the available reference material does not establish a completed submarine-basing program or provide a date for implementation. Publicly available information about the dockyard's organizational structure, workforce, financial scale, and broader commercial activities is limited. The facility is best understood as a state naval-industrial installation serving national defense requirements rather than as an independently listed commercial shipbuilding company.

Mahidol Adulyadej Naval Dockyard is a Royal Thai Navy shipyard in Sattahip, Chonburi. Its Thai name is อู่ราชนาวีมหิดลอดุลยเดช กรมอู่ทหารเรือ. The facility is named for Prince Mahidol Adulyadej, who served in the Royal Siamese Navy from 1912 to 1914. The available public reference material does not identify the dockyard's founding year or provide a detailed account of its institutional development. The yard's documented role includes construction and support of Royal Thai Navy vessels. Its best-known construction work includes HTMS Krabi, an offshore patrol vessel commissioned in 2013. The ship was produced as a modified version of the River-class patrol vessel design, demonstrating the facility's role in developing Thailand's domestic naval shipbuilding capability. The dockyard later built HTMS Prachuap Khiri Khan, the second Krabi-class offshore patrol vessel, which entered service in 2017. In addition to new construction, the dockyard undertakes refit and maintenance work. HTMS Bangpakong, a vessel built in China, was refitted at the facility and returned to Royal Thai Navy service in early 2017. This project indicates that the dockyard functions as a fleet-support center as well as a new-build shipyard, helping maintain vessels obtained from both domestic and foreign sources. There have been plans to base one of Thailand's submarines at the dockyard. The available source does not confirm that such a basing arrangement was completed, nor does it provide operational details. Consequently, the submarine-related plan should be treated as a reported future or proposed role rather than an established current capability. Information on the dockyard's leadership, budget, workforce, commercial customers, and production capacity is not identified in the supplied sources. It is therefore most accurately characterized as a state naval-industrial facility operating for the Royal Thai Navy, rather than as a separately listed commercial shipbuilding corporation.

1. 2017HTMS Bangpakong returns after refit

   The Chinese-built HTMS Bangpakong completed a refit at the dockyard and returned to service in early 2017.

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2. 2017HTMS Prachuap Khiri Khan enters service

   HTMS Prachuap Khiri Khan, the second Krabi-class offshore patrol vessel built at the yard, entered service.

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3. 2013HTMS Krabi commissioned

   HTMS Krabi, a modified River-class offshore patrol vessel built at the dockyard, entered Royal Thai Navy service.

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4. 1914Prince Mahidol Adulyadej ends naval service

   Prince Mahidol Adulyadej's documented service in the Royal Siamese Navy concluded.

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5. 1912Prince Mahidol Adulyadej begins naval service

   Prince Mahidol Adulyadej, whose name the dockyard bears, began service in the Royal Siamese Navy.

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A domestic Royal Thai Navy shipbuilding and fleet-support facility focused on naval vessel construction, refitting, maintenance, and operational readiness.

• Krabi-class offshore patrol vesselsNaval vessels2013

  The dockyard is associated with construction of Thailand's Krabi-class offshore patrol vessels. The class is based on a modified River-class patrol vessel design. HTMS Krabi was commissioned in 2013, followed by HTMS Prachuap Khiri Khan in 2017. These ships represent the facility's documented domestic new-build capability for medium-sized Royal Thai Navy patrol vessels.

• Naval vessel refit and modernizationShipyard services

  Mahidol Adulyadej Naval Dockyard supports the overhaul and return to service of Royal Thai Navy vessels. A documented example is the refit of HTMS Bangpakong, a Chinese-built vessel that returned to service in early 2017. The available material does not specify the full technical scope of the work.

• Proposed submarine basing roleStrategy

  Plans have been reported to base one of Thailand's submarines at Mahidol Adulyadej Naval Dockyard.

  What changed. The dockyard was identified as a potential submarine operating base, although the supplied source does not confirm implementation.

  Aftermath. The available material does not establish whether the plan was completed or describe any resulting infrastructure changes.

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• 2017HTMS Bangpakong returned to service after dockyard refit

  The Chinese-built HTMS Bangpakong underwent refitting at Mahidol Adulyadej Naval Dockyard and re-entered service in early 2017.

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• 2017HTMS Prachuap Khiri Khan enters service as second Krabi-class vessel

  The dockyard built HTMS Prachuap Khiri Khan, the second Krabi-class offshore patrol vessel associated with the facility.

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• 2013HTMS Krabi commissioned after construction at Mahidol Adulyadej Naval Dockyard

  HTMS Krabi, an offshore patrol vessel based on a modified River-class design, was built at the dockyard and commissioned into Royal Thai Navy service.

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1. Mahidol Adulyadej Naval Dockyard
2. Mahidol Adulyadej Naval Dockyard official website