Service

Class Approval Drawings & Statutory Documentation

Class 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.

What you receive

Structural drawings and scantling calculations to the applicable class rules
Intact and damage stability booklets, loading manual and inclining experiment procedure and report
General arrangement, tank plan, capacity plan, fire and safety plans, LSA plans
Load line, tonnage and freeboard calculations; SOLAS, MARPOL and flag-state statutory submissions
Modification and conversion drawings with rule references for class notation changes
Plan-approval correspondence: comment resolution sheets and re-submissions until stamped

Drawing lists per class society

Each society publishes its own list of drawings required for approval, and the structure of the submission differs between, for example, DNV Rules for Ships, ABS Steel Vessel Rules and IRS Rules. We maintain the drawing list per society and per vessel type, so a submission is complete on the first pass. The checklist we use is published on this site as a free resource for yards and owners.

Conversions and modifications

Most of our class work is on vessels that already exist: OSV-to-WSV and barge-to-PLB conversions, deck strengthening for new equipment, davit and crane installations, accommodation additions and notation changes. For these the package is the delta from the approved drawings, with the rule references that justify each change, plus the updated stability and longitudinal strength where lightship has moved. A 200-tonne-steel OSV-to-WSV conversion in Norway and a 4 x 50-tonne davit installation in Nigeria were delivered this way.

Statutory and flag documentation

Where the flag or a recognised organisation requires it we prepare the load line, tonnage, SOLAS and MARPOL documents alongside the class drawings, and coordinate with the surveyor for the inclining experiment and lightship survey. For Indian-flag vessels we work with IRS and the Directorate General of Shipping requirements.

Class societies

ABSDNVLRBVIRSNKKRBKIRINACCS

Statutory

SOLASMARPOLLoad Line 1966IMO IS Code 2008Tonnage 1969DGS (India)

Software

ShipConstructorRhinoMaxsurfNAPAGHSAutoCAD

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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.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.Davit installation — 4 × 50 MT davitsStructural engineering for the installation of four 50 MT davits along the port side of an offshore construction vessel.Vessel pre-purchase survey & inspectionFull vessel condition assessment, thickness gauging, and engineering recommendations — vessel purchased at a 20% discount on asking price.

Related services

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.Third-Party Verification & Independent Design ReviewIndependent verification of offshore structural, naval architecture and pipeline engineering: design reviews, re-analysis with our own models, structural integrity assessments and owner’s-engineer review of contractor deliverables. Our team has reviewed five jackets and topsides for an operator and assessed 39 ONGC jacket structures, and supports jack-up site assessments in ONGC, ADNOC and Aramco fields.Stability Booklets, Loading Manuals & Inclining ExperimentsIntact 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.

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.Offshore & Marine Engineering Support for Nigeria and West AfricaEngineering support for vessel owners, installation contractors and terminal developers in Nigeria, Ghana, Angola and the wider Gulf of Guinea: vessel upgrades and deck-equipment installation, pipe-lay and installation engineering, class approval packages and design review. Our team has delivered a pipe-lay vessel piggyback pipeline upgrade and a four-davit installation on vessels operating in Nigeria.

Sectors

Marine, Vessels & Conversions

Disciplines

Naval Architecture

Frequently asked questions

Which classification societies have you submitted drawings to?

ABS, DNV, LR, BV, IRS, NK, KR, BKI, RINA and CCS. The founder previously worked as an assistant surveyor at the Indian Register of Shipping.

Do you handle the plan-approval comments as well as the drawings?

Yes. The scope includes the comment-resolution sheets and re-submissions until the drawings are stamped, and coordination with the attending surveyor for surveys and the inclining experiment.

Can you work from the yard’s or owner’s existing drawings?

Yes. For conversions and modifications we start from the approved drawings and produce the delta package with the rule references that justify each change.