Stability:

Naval Design Limited are able to perform stability analyses in accordance with Naval Standards and practice. We provide the following areas of expertise to our clients:

  • Loading conditions including normal or compensated tanks
  • GZ curves: intact, damaged or balanced on a wave
  • Damage definition
  • Floodable length calculations
  • Freeboard calculations
  • One and two point grounding analysis and assessing float off
  • Limiting KG curves for stability management
  • Tank calibrations
  • Define the watertight subdivision
The analysis software we use has been developed and used by QinetiQ to independently validate all of the stability analysis from first principles. Naval Design Limited can use the software to analyse the stability of any vessel from initial design, though life, until disposal.

Warship Stability:

Warship stability can be assessed in accordance with the following standards and tools in addition to those listed above:

  • Zones for watertight integrity
  • UK Ministry of Defence Naval Engineering Standard 109 criteria (intact and damaged surface stability, docking)
  • Carpet plots including automatic case generation for symmetric or asymmetric damage

Submarine Stability:

Surfacing Under Ice Naval Architectural Services are able to assess the stability of a submarine using the following standards and tools:

  • Calculation of submerged BG
  • UK Ministry of Defence Naval Engineering Standard 189 criteria
    (intact and damaged surface stability, surfacing under ice)
  • Calculation of Main Ballast Tank blowable capacity and reserve of buoyancy
  • Trim polygon calculations.
  • Calculation of trim draughts.

Merchant ship Stability:

Naval Architectural Services are able to assess the stability of a merchant vessel against commercial stability standards:

  • UK MCA Workboat Regulations
  • Stockholm Agreement RORO Water on Deck
  • MARPOL Regulations 1973
  • DNV Ice Capable Ships Regulations
  • IMO Probabilistic Damage for Cargo vessels
  • IMO deterministic criteria
  • SOLAS Regulations

Latest News