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Stability Booklets, Loading Manuals & Inclining Experiments

Intact and damage stability booklets, loading manuals and inclining experiment procedures and reports for offshore support vessels, barges, jack-ups and converted units, prepared to the IMO Intact Stability Code, SOLAS and the class rules and taken through class and flag approval. Required for every newbuild and after every conversion that moves lightship.

Stability Booklets, Loading Manuals & Inclining Experiments

What you receive

  • Hydrostatics, cross-curves and tank calibration tables (Maxsurf / NAPA / GHS)
  • Intact stability against IMO IS Code 2008, MODU Code or the applicable criteria; weather criterion where required
  • Damage stability (deterministic or probabilistic) and subdivision, including SPS Code for special-purpose ships
  • Loading manual with worked conditions and longitudinal strength checks
  • Inclining experiment procedure, attendance, report and lightship certificate inputs
  • Class and flag submission and comment resolution; loading-computer data where fitted

When stability work is required

Newbuilds; any conversion or modification that changes lightship or its centre of gravity beyond the flag’s tolerance; a change of service or notation (an OSV becoming a WSV or an SPS-coded unit, a barge becoming a pipe-lay barge); and re-approval after an inclining experiment. We delivered the stability re-assessment for a 200-tonne-steel OSV-to-WSV conversion in Norway under DNV and support pre-purchase surveys with a stability review.

Software and class

Maxsurf Stability, NAPA and GHS depending on the class society’s preference, with ShipConstructor or Rhino for the hull model. Submissions to ABS, DNV, LR, BV, IRS, NK, KR, BKI, RINA and CCS.

Codes & standards

IMO IS Code 2008SOLAS II-1MODU CodeSPS CodeLoad Line 1966DNV / ABS / IRS rules

Software

MaxsurfNAPAGHSShipConstructorRhino

Vessels

OSV / PSV / AHTSWSVBargesJack-upsFSRU / FPSOAccommodation units
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Projects that prove it

OSV to WSV conversion — Norway, 200 MT steelDetailed engineering for OSV to Well Stimulation Vessel conversion — deckhouse structure, nesting plans, fabrication drawings, 200 MT+ steel engineered.Vessel pre-purchase survey & inspectionFull vessel condition assessment, thickness gauging, and engineering recommendations — vessel purchased at a 20% discount on asking price.Owner's advisory — vessel selection & PLB conversionStrategic advisory for purchase and conversion of a vessel to Pipe Lay Barge — vessel purchased at a reasonable negotiated price.

Related services

Class Approval Drawings & Statutory DocumentationClass approval drawings, calculations and statutory documents for newbuilds, conversions and modifications, prepared to the rules of ABS, DNV, LR, BV, IRS, NK, KR, BKI, RINA and CCS and taken through plan approval on the owner’s or yard’s behalf. Founder experience as an IRS surveyor means the package is written the way the reviewer reads it.OSV & Vessel Conversion EngineeringConversion engineering for offshore support and work vessels: OSV to well-stimulation vessel, barge to pipe-lay barge, tanker to FSO/FPSO and LNG carrier to FSRU. We deliver the feasibility study, the structural, stability and systems engineering and the class approval package, as on a 200-tonne-steel OSV-to-WSV conversion completed in Norway in 2024.Mooring & Station-keeping AnalysisMooring analysis for spread, jetty, single-point and temporary moorings of FSRUs, FPSOs, barges, jack-ups and construction vessels: quasi-static and dynamic analysis in OrcaFlex and AQWA to DNV-OS-E301, API RP 2SK and OCIMF MEG4, with line, anchor, fairlead and fender loads for the structural designers and the class submission.

Regions we serve for this

Offshore, Marine & Pipeline Engineering in IndiaKannamwar Engineering is headquartered in Mumbai and delivers offshore structural, naval architecture and pipeline engineering to operators, EPC contractors and yards across India: ONGC’s western offshore fields, HPCL’s marine terminals, west-coast LNG infrastructure and the east-coast basins. 39 ONGC jacket structures assessed, riser and conductor installation campaigns engineered, and 120+ days of offshore site supervision at Mumbai High.Naval Architecture & Vessel Conversion Engineering for Norway and the North SeaRemote engineering support for vessel owners, conversion yards and offshore contractors in Norway, the UK and the wider North Sea: OSV and PSV conversions, deck strengthening and class approval under DNV, stability and mooring analysis, and third-party design review. In 2024 our team engineered an OSV-to-well-stimulation-vessel conversion in Norway that added 200 tonnes of steel under DNV class.Offshore Engineering Support for the Gulf: UAE, Saudi Arabia, Qatar, Oman, KuwaitEngineering support for EPC, T&I and fabrication contractors and jack-up operators working in the Arabian Gulf: jacket and topside engineering, sea-fastening and load-out packages, lifting engineering, jack-up site-specific assessment support and third-party design review, delivered from Mumbai in the same working day. Saudi Aramco and Lamprell are among our clients.

Sectors

Marine, Vessels & Conversions

Disciplines

Naval Architecture

Further reading

Stability Analysis for Offshore Vessels — The FundamentalsIntact and damage stability essentials every offshore vessel must satisfy.

Frequently asked questions

Do you attend the inclining experiment?

Yes. We write the procedure, attend with the class or flag surveyor, and issue the report that derives the new lightship for the stability booklet.