DNV-ST-0378 vs NORSOK R-002: Two Standards, One Padeye

A padeye sits at the intersection of two completely different regulatory worlds. DNV-ST-0378 controls how the padeye is designed — the geometry, material, weld class, load cases, and proof load test. NORSOK R-002 controls how it is used — the lift categorisation, rigging plan, sling angles, DAF application, and sign-off chain. Both standards address the same physical object from fundamentally different angles, and both must be satisfied for a lift to proceed legally on the Norwegian Continental Shelf.

This article maps exactly where each standard's authority begins and ends, clause by clause, so you can design, certify, and operate without doubling effort or leaving gaps.

1. Standard Scope Overview

Both standards are part of the Norwegian offshore lifting framework, but they address different lifecycle phases:

Think of them as a baton relay: DNV-ST-0378 hands off a designed and certified padeye to NORSOK R-002, which governs every lift thereafter. DNV-RP-0232 runs alongside both, ensuring equipment stays certified over its operating life.

2. Where the Responsibility Splits

3. Padeye Design under DNV-ST-0378

DNV-ST-0378 Section 5 ("Lifting Appliances") is the primary reference for padeye structural design. Key requirements:

Geometry and sizing ST-0378 §5.3

The standard defines minimum plate thickness relative to the pin diameter, minimum cheek plate coverage, and limits on the ratio of the hole radius to the overall plate radius. The padeye must be designed for the resultant load — combining in-plane and out-of-plane components — not just the nominal lift load.

Load cases that DNV-ST-0378 requires the padeye to survive:

Weld requirements ST-0378 §5.5

Padeye-to-structure welds are classified as weld quality class B or C depending on fatigue exposure. Full-penetration welds are required at the padeye base unless the geometry is specifically assessed against partial penetration weld capacity. NDT extent is defined in the standard: typically 100% MPI on fillet welds and 100% UT/RT on full-penetration welds in high-stress zones.

Proof load test ST-0378 §5.3.3

Before a padeye enters service, a proof load test is required. The proof load is 1.25× SWL for standard padeyes and 1.5× SWL where DNV class notation applies. The test must be witnessed and documented per DNV-RP-0232, with a test certificate issued under EN 10204 §3.2 for class-notated equipment.

SWL marking ST-0378 §5.3.3

The SWL must be permanently marked on the padeye — typically stamped or stencilled. The SWL stated on the padeye is the maximum allowed hook load including DAF effects. This is the number that NORSOK R-002 rigging plans must not exceed.

4. Lifting Operations under NORSOK R-002

Once the padeye is designed, certified, and marked, NORSOK R-002 takes over for every operational lift. The standard's key requirements:

Lift categorisation

R-002 requires every planned lift to be categorised before a rigging plan is prepared:

Rigging plan minimum content

For any lift involving a padeye, the NORSOK R-002 rigging plan must show:

• Padeye SWL (from marking or certificate)
• Rigged weight (including all spreaders, shackles, slings)
• Hook load = rigged weight × DAF
• Sling configuration — leg count, lengths, angles from vertical
• Sling leg load calculation (hook load ÷ legs × angle correction factor)
• Verification that sling leg load ≤ SWL of each padeye
• Shackle and sling SWL (must exceed sling leg load with margin)
• Certificate references for all lifting equipment

5. Clause Cross-Walk: Shared Territory

Several requirements appear in both standards. Understanding which standard takes precedence in each case prevents over- or under-engineering:

6. Dynamic Amplification Factor (DAF): Who Sets It?

DAF is the most common source of confusion between the two standards. Both reference it; neither owns it exclusively.

DNV-ST-0378 perspective: The padeye designer selects a DAF for structural analysis — typically 1.3 for inshore/harbour lifts or 1.5 for open-water offshore lifts from a vessel — and designs the padeye to survive the resulting load. This DAF is embedded in the SWL calculation. The SWL already accounts for a specific DAF assumption.

NORSOK R-002 perspective: The lift planner applies DAF to the rigged weight to compute the hook load that goes on the rigging plan. The hook load must be ≤ SWL. If the R-002 rigging engineer uses a higher DAF than the ST-0378 design assumed, the hook load can exceed SWL — which is a non-conformance.

7. Sling Angles: Design Assumption vs. Rigging Reality

Sling angle is the second major interface between the two standards. DNV-ST-0378 requires the padeye to be designed for the resultant load — which depends on sling angle, number of legs, and any out-of-plane component. NORSOK R-002 requires the rigging plan to document actual sling angles and verify that leg loads are within SWL.

The mismatch risk: a padeye designed for 4 slings at 45° may be over-loaded if the rigging plan uses 60° angles — the leg load increases by approximately 15% as the angle increases from 45° to 60° from vertical. The rigging engineer must ensure actual angles match (or are less severe than) the design assumption.

8. Practical Workflow: Design → Certify → Operate

9. Common Gaps and Non-Conformances

10. Padeye Sign-Off Checklist

Before any NCS lift involving a padeye, confirm all of the following: