Offshore Standards Questions,
Answered with Clauses

DNV-ST-0378 is DNV's standard for offshore and marine containers, portable offshore units, and lifting appliances. It applies when equipment is lifted on or off offshore installations or vessels in DNV-classed operations.

Appendix E covers padeye design specifically — including SWL marking §E.2, dynamic amplification factor (DAF) §3.4, pin hole tolerances, weld requirements, and material certificate requirements (EN 10204 §3.1).

If you're designing a lifting point on a module, container, or piece of equipment that will be lifted offshore by a classed crane or vessel, DNV-ST-0378 almost certainly applies.

Per DNV-ST-0378 App. E, padeye design checks five utilisation ratios:

1. Design load = SWL × DAF × sling angle factor
2. Pin hole bearing stress ≤ 0.9 × yield strength §E.4.2
3. Cheek plate weld throat — minimum throat per weld classification
4. Main plate shear-out area — gross shear area through the plate
5. Combined stress at hole edge — von Mises or principal stress check

All utilisation ratios must be ≤ 1.0. The Leide padeye calculator performs all five checks automatically with clause references.

DNV-ST-0378 covers lifting appliances, offshore containers, and portable offshore units — it governs the equipment being lifted and the lift points (padeyes) on that equipment.

NORSOK R-002 covers lifting equipment for Norwegian Continental Shelf operations — including cranes, rigging, and the entire lifting system operation.

In practice: the padeye on a topside module uses DNV-ST-0378 Appendix E for design. The crane and sling system making the lift is governed by NORSOK R-002. Both apply simultaneously on an NCS lift.

DNV-ST-0378 App. E §E.2 requires EN 10204 Type 3.1 (or 3.2) material certificates for padeye plates and cheek plates. A Type 2.2 certificate (test report) is not sufficient.

The drawing must explicitly reference EN 10204 §3.1, and the certificate must be traceable to the specific heat or batch of material used. Missing or incorrect certificate type is one of the most common CRITICAL findings in drawing compliance reviews.

The Dynamic Amplification Factor (DAF) accounts for dynamic loads during lifting — crane acceleration, wave-induced vessel motion, and impact. Design load = SWL × DAF × sling factor.

Per DNV-ST-0378 §3.4 and NORSOK R-002, typical values:

• 1.05 — crane on fixed platform, calm conditions, shore lift
• 1.10–1.15 — standard offshore lift, moderate conditions
• 1.25–1.35 — splash zone lifts, heavy sea states, dynamic analysis not performed

The DAF must be stated on the lift plan and traceably linked to the padeye design. Higher DAF = larger design load = thicker plate or larger welds.

A compliant padeye drawing per DNV-ST-0378 App. E must include:

1. SWL — clearly stated in tonnes or kN
2. Pin hole diameter — with tolerance per ISO 2768 or explicit callout
3. Material specification — grade and EN 10204 §3.1 certificate reference
4. Weld throat and symbol — per ISO 2553 or AWS A2.4
5. Cheek plate dimensions — if applicable
6. NDT requirements — MT or UT on load-bearing welds
7. Surface treatment — corrosion protection class
8. Title block — drawing number, revision, approval

Missing any of items 1–6 typically results in CRITICAL or MAJOR findings.

CRITICAL — Code violations that could directly compromise structural integrity or safety. Must be resolved before fabrication begins. Examples: missing SWL, no NDT specified on primary load path welds, missing EN 10204 §3.1 material certificate reference.

MAJOR — Significant non-conformances requiring resolution before fabrication. Examples: missing tolerance callouts, incorrect weld symbol convention, incomplete title block, missing scale.

MINOR — Best-practice deviations unlikely to cause fabrication errors, but should be corrected. Examples: non-standard note formatting, missing revision history field, drawing not to scale indication missing.

ISO 2553 defines weld symbols on technical drawings: the reference line convention, arrow side vs other side, supplementary symbols (backing strip, flush finish, weld-all-around), and how to specify throat size, leg length, and NDT requirements.

In offshore fabrication, incorrect weld symbols are a leading cause of fabrication non-conformances. Drawings using AWS A2.4 (US convention) instead of ISO 2553 can be misread by fabricators trained on ISO — a common MAJOR finding in international offshore projects.

Leide's drawing checker automatically detects weld symbol convention and flags mismatches.

ISO 2768 sets general tolerances for features without individual tolerance callouts on a drawing.

Part 1 (ISO 2768-1) — linear and angular dimensions, four classes:
• f (fine) — precision machined parts
• m (medium) — general machined parts (most common)
• c (coarse) — heavy fabrication
• v (very coarse) — structural steel, large assemblies

Part 2 (ISO 2768-2) — geometrical tolerances, three classes: H, K, L

For offshore structural components: ISO 2768-m K is most common. Specify in the drawing notes or title block as: ISO 2768-m K.

NORSOK N-004 (Design of Steel Structures) applies to Norwegian Continental Shelf (NCS) fixed and floating installations regulated under PSA Norway.

DNV-OS-C101 (Design of Offshore Steel Structures) is DNV's classification-based equivalent, applying globally to DNV-classed vessels and units.

Both use limit state design and are technically similar. On NCS projects: NORSOK N-004 typically governs fixed installations. For DNV-classed FPSOs or semi-submersibles: DNV-OS-C101. In practice, many NCS projects specify both — NORSOK N-004 as the governing standard with DNV-OS-C101 as the verification reference.

Leide currently indexes 30+ standards including:

DNV: DNV-ST-0378, DNV-RU-SHIP Pt. 3, DNV-OS-C101, DNV-OS-E301, DNV-RP-C205, DNV-RP-N103
NORSOK: NORSOK N-004, NORSOK M-101, NORSOK Z-015, NORSOK R-002
ISO: ISO 2768-1/2, ISO 1101, ISO 5458, ISO 14405, ISO 1302, ISO 286-1, ISO 8015
EN: EN 13445-3, EN 10025-2, EN 10028-7
ASME: ASME B31.3

Standards are expanded continuously based on user requests. The AI Navigator searches across all standards simultaneously and returns clause-cited answers in under 3 seconds.

Leide uses a two-pass AI analysis: (1) extract drawing data — dimensions, tolerances, notes, weld symbols, title block; (2) check extracted data against 15+ specific rules from DNV-ST-0378, ISO 2768, ISO 1101, ISO 2553, EN 13445, and drawing presentation standards.

Each finding is classified:

• kb_backed — directly supported by an indexed clause. High reliability.
• inferred — based on engineering reasoning where the specific clause is not indexed. Should be verified against the standard.

CRITICAL and MAJOR findings from kb_backed sources are highly reliable. The checker is designed to surface potential issues for engineer review — not to replace engineering judgement. Average review time: under 2 minutes on a standard padeye drawing.