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NavSource Online: Mine Warfare Vessel Photo Archive

ex-HMS J-831

BYMS-2031 was built for Great Britain

BYMS-1 Class Motor Minesweeper:

  • Laid down 11 May 1942 as BYMS-31 by American Car and Foundry Co., Wilmington, DE
  • Launched 7 September 1942
  • Completed 12 March 1943
  • Transferred to Great Britain reclassified HMS J-831, 13 March 1943
  • Reclassified HMS BYMS-2031
  • Struck from the Naval Register 10 June 1947 and transferred to the State Department, Foreign Liquidation Commission
  • Returned to U.S. custody 10 July 1947, sold to Anthonio Theuma of Malta and named Nanridi
  • Renamed Monte Carmelo
  • Sold at Gibraltar
  • Confiscated by Italian authorities at Palermo, Sicily for tobacco smuggling
  • Fate unknown.


  • Displacement 270 t.
  • Length 136'
  • Beam 24' 6"
  • Draft 8'
  • Speed 15 kts.
  • Complement 32
  • Armament: One 3"/50 dual purpose gun mount, two 20mm mounts and two depth charge projectors
  • Propulsion: Two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    BYMS-31 88k 7 September 1942
    After launching
    American Car and Foundry Co. photo
    Hagley Digital Archives
    Photo added 7 April 2022
    BYMS-31 171k 12 March 1943
    American Car and Foundry Co. photo
    BYMS-31 63k As completed
    Imperial War Museum photo IWM (FL 7331)
    Mike Green

    There is no DANFS history available for BYMS-2031
    Back to the Main Photo Index Back to the Mine Warfare Ship Photo Index Back to the British Motor Minesweeper (BYMS) Photo Index

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    This page created and maintained by Joseph M. Radigan & Michael Mohl
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