AI DRAWING REVIEW  ·  SAMPLE REPORT
Drawing Compliance Review Report
Padeye Assembly Drawing
Compliance Review
FPSO Topside Lifting Points — Deck B Pad-eye PL-4850-01 & PL-4850-02
Document No.
LDRA-PAD-0001
Revision
0
Drawing Ref.
FPV-STR-DWG-4850, Rev. B
Project
Oseberg South FPSO — Topside Structural Package
Classification
DNV GL  ·  Consequence Class 3
Prepared By
Leide AI Drawing Review Engine
Reviewed By
Senior Structural Engineer (Leide Verification Layer)
Date
2026-04-06
STANDARDS APPLIED
DNV-ST-0378:2023 NORSOK N-001:2012 EN 10025-2:2019 ISO 2768-m AWS D1.1:2020
⚠ 2 CRITICAL NON-CONFORMANCES — DOES NOT COMPLY
This report was generated by Leide AI. Every finding cites the source clause, chapter and verse.
Page 1 of 7  ·  leide.ai
Padeye Assembly Drawing — Compliance Review
Doc. No. LDRA-PAD-0001  ·  Rev. 0  ·  2026-04-06

1 Introduction

1.1 Scope

This document presents the results of an AI-assisted compliance review of drawing FPV-STR-DWG-4850 Rev. B, covering two padeye assemblies (PL-4850-01 and PL-4850-02) installed on Deck B of the Oseberg South FPSO. The review was performed by the Leide AI Drawing Review Engine in accordance with the standards listed in Section 1.4.

The review covers: weld sizing and throat thickness adequacy; hole geometry and tolerancing; material specification completeness; proof load callout; and dimensional consistency between BOM and assembly drawing. Structural capacity calculation (ULS/ALS verification) is outside the scope of this review and is addressed in the companion calculation note.

1.2 Abbreviations

AbbreviationDefinition
ALSAccidental Limit State
BOMBill of Materials
CCConsequence Class (per DNV-ST-0378 Table 2-1)
FPSOFloating Production Storage and Offloading
HAZHeat-Affected Zone
NDTNon-Destructive Testing
SWLSafe Working Load
ULSUltimate Limit State
WPSWelding Procedure Specification

1.3 Nomenclature

SymbolDescriptionUnit
aFillet weld throat size (design)mm
aminMinimum permissible weld throat per standardmm
dhPadeye hole diametermm
dpConnecting pin diameter (shackle or swivel)mm
FproofRequired proof test loadkN
SWLSafe Working Load (design)t
tpPadeye plate thicknessmm
Padeye Assembly Drawing — Compliance Review
Doc. No. LDRA-PAD-0001  ·  Rev. 0  ·  2026-04-06

1.4 Codes and Standards

Ref.StandardTitleEdition
[1]DNV-ST-0378Standard for Offshore and Platform Lifting Appliances2023
[2]NORSOK N-001Integrity of Offshore Structures2012
[3]EN 10025-2Hot Rolled Products of Structural Steel — Technical Delivery Conditions2019
[4]ISO 2768-mGeneral Tolerances — Tolerances for Linear and Angular Dimensions1989
[5]AWS D1.1Structural Welding Code — Steel2020
[6]DNV-OS-D101Marine and Machinery Systems and Equipment2021

2 Drawing Information

ParameterValueSource
Drawing numberFPV-STR-DWG-4850Title block
RevisionBTitle block
Drawing titlePadeye Assembly — Deck B Lifting Points PL-4850-01 & 02Title block
Design SWL25 t (each padeye)Note 1
Padeye plate thickness (tp)30 mmSection A-A
Hole diameter (dh)82 mmDetail B
Material calloutS355 (sub-grade not specified)BOM, item 1
Weld throat size12 mm (all fillet welds)Weld symbol, Section A-A
Proof load calloutNot statedNotes — absent
Corrosion allowanceNot documentedNotes — absent
NDT requirementMT on welds (Note 3)Note 3
✓
All values above were extracted by the Leide AI vision engine directly from the uploaded drawing file. Each field is linked to its source location (title block, section view, note, or BOM row). No values are assumed or interpolated from external sources.
Padeye Assembly Drawing — Compliance Review
Doc. No. LDRA-PAD-0001  ·  Rev. 0  ·  2026-04-06

3 Executive Summary

⚠  Drawing does not comply — 2 critical non-conformances identified
2
Critical
1
Major
2
Minor
1
Info
Drawing must be revised to address all CRITICAL and MAJOR findings before fabrication approval. MINOR and INFO items should be addressed in the next revision.

4 Findings Summary

ID Severity Description Extracted Required Clause Status
F-001 CRITICAL Fillet weld throat undersized a = 12 mm amin = 14 mm DNV-ST-0378 §7.3.4 NON-CONFORM
F-002 CRITICAL Proof load not specified on drawing — (absent) Fproof = 500 kN DNV-ST-0378 §6.4.2 NON-CONFORM
F-003 MAJOR Material sub-grade not specified S355 (no sub-grade) S355J2 or S355K2 DNV-ST-0378 §5.2 + EN 10025-2 Tab. 7 NON-CONFORM
F-004 MINOR Hole tolerance class not called out dh = 82 mm (no tolerance) H11 per ISO 2768-m ISO 2768-m §3.1 + DNV-ST-0378 §7.2.1 NON-CONFORM
F-005 MINOR Corrosion allowance absent from drawing notes — (absent) State or reference design basis DNV-OS-D101 §4.3.1 NON-CONFORM
F-006 INFO NDT scope — MT coverage adequate, UT on parent plate not specified MT on welds (Note 3) Recommend UT for tp > 25 mm DNV-ST-0378 §8.4.2 ACCEPTABLE
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5 Finding Details

F-001
Fillet Weld Throat Size — Below Minimum Requirement
CRITICAL
Location on drawing
Section A-A weld symbol; all fillet welds padeye-to-deck plate junction
AI-extracted value
a = 12 mm (stated as "12f" on Section A-A weld symbol)
Required value
amin = 0.7 × tp,min = 0.7 × 20 mm = 14 mm
Shortfall
−2 mm (85.7% of required)
Clause reference: DNV-ST-0378:2023 §7.3.4 — "The throat size of fillet welds connecting the padeye plate to the supporting structure shall not be less than 0.7 times the thinner plate thickness, and in no case less than 8 mm." With tp = 30 mm and the deck plate at t = 20 mm (as noted in BOM item 3), amin = 0.7 × 20 = 14 mm. Drawing specifies 12 mm — NON-CONFORMANCE.

Required action: Revise weld callout to a minimum of 14 mm throat. Verify welding procedure (WPS) supports this throat size for the specified material grade.

F-002
Proof Load — Not Specified on Drawing
CRITICAL
Location on drawing
Drawing notes (Notes 1–5) — absent
AI-extracted value
— (proof load not found anywhere on drawing)
Required value
Fproof = 2.0 × SWL × g = 2.0 × 25 t × 9.81 = 490.5 kN → round to 500 kN
Basis
SWL = 25 t per Note 1; Consequence Class 3 per drawing title block
Clause reference: DNV-ST-0378:2023 §6.4.2 — "The proof load shall be stated on the drawing. For lifting appliances in Consequence Class 3, the proof load shall not be less than 2.0 times the rated capacity (SWL)." The drawing does not contain any proof load callout — NON-CONFORMANCE.

Required action: Add proof load callout (minimum 500 kN) to drawing notes. Update inspection and test plan (ITP) accordingly.

F-003
Material Sub-Grade — Incomplete Specification
MAJOR
Location on drawing
BOM, Item 1 (padeye plate); Item 3 (deck plate)
AI-extracted value
"S355" — sub-grade absent on both BOM items
Required value
S355J2 (min.) per DNV-ST-0378 §5.2, or S355K2 for t > 30 mm
Clause reference: DNV-ST-0378:2023 §5.2 — "Steel for padeyes shall comply with EN 10025-2 and the sub-grade shall be specified. For components in Consequence Class 3, minimum sub-grade J2 applies for thickness ≤ 40 mm." Cross-reference: EN 10025-2:2019 Table 7 — impact energy requirements differ by sub-grade. "S355" without sub-grade is ambiguous and does not satisfy the requirement — NON-CONFORMANCE.

Required action: Revise BOM to specify "S355J2" for tp = 30 mm, or "S355K2" if Charpy test temperature requires it. Confirm with materials engineer.

Padeye Assembly Drawing — Compliance Review
Doc. No. LDRA-PAD-0001  ·  Rev. 0  ·  2026-04-06
F-004
Hole Diameter — Tolerance Class Not Called Out
MINOR
Location on drawing
Detail B (padeye hole, plan view)
AI-extracted value
dh = ⌀82 mm (no tolerance band stated)
Required
H11 tolerance class: ⌀82+0.1900 mm per ISO 2768-m Table 1
Clause reference: DNV-ST-0378:2023 §7.2.1 — "Hole diameter tolerances shall be clearly stated on the drawing or by reference to a general tolerance standard." Cross-reference: ISO 2768-m §3.1 — medium class applies as default for general dimensions, but hole fits for pins and shackles require explicit callout. Pin clearance is safety-critical for CC3 lifting points — NON-CONFORMANCE (MINOR).
F-005
Corrosion Allowance — Not Documented
MINOR
Location on drawing
Drawing notes (Notes 1–5) — absent
AI-extracted value
— (no corrosion allowance or reference found)
Best practice
Minimum 1.0 mm CA for offshore topside structural steel; or reference design basis document
Clause reference: DNV-OS-D101:2021 §4.3.1 — "Corrosion protection and/or corrosion allowances shall be documented for all structural members exposed to marine environments." The drawing does not state the corrosion allowance or reference a design basis — NON-CONFORMANCE (MINOR).
F-006
NDT Scope — MT Welds Adequate; UT on Parent Plate Recommended
INFO
Location on drawing
Note 3
AI-extracted value
MT on all welds, 100% coverage
Recommendation
Add UT on padeye plate (tp = 30 mm) to check for laminar defects prior to welding
Clause reference: DNV-ST-0378:2023 §8.4.2 — MT on all welds in CC3 is mandatory and is correctly specified. UT on the parent plate for t > 25 mm is recommended (not mandatory) to detect through-thickness lamination in Z-direction loaded plates. Current NDT scope is ACCEPTABLE; UT addition is advisory only.
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6 Conclusions and Recommendations

  1. Drawing does not comply with DNV-ST-0378:2023. Two critical non-conformances were identified (F-001 weld throat, F-002 proof load) that must be resolved before fabrication can proceed. Both findings are unambiguous: the standard provides numerical requirements, and the drawing falls below them.
  2. Fillet weld throat (F-001): Revise all weld callouts in Section A-A from 12 mm to a minimum of 14 mm throat. Per DNV-ST-0378 §7.3.4, the throat must be ≥ 0.7 × tmin = 0.7 × 20 mm = 14 mm. Confirm WPS adequacy for revised throat size.
  3. Proof load (F-002): Add proof load note to drawing: "Proof Load = 500 kN minimum (2.0 × SWL × g), per DNV-ST-0378 §6.4.2, CC3." Update the ITP to include proof load testing prior to first use.
  4. Material sub-grade (F-003): Revise BOM Item 1 from "S355" to "S355J2" (for t ≤ 40 mm, CC3). Confirm Charpy test temperature requirement with materials engineer — if design temperature < −10°C, sub-grade K2 may be required per EN 10025-2 Table 7.
  5. Hole tolerance and corrosion allowance (F-004, F-005): Minor items to be addressed in the next drawing revision. Add tolerance callout for padeye hole (H11) and state corrosion allowance in drawing notes.
Finding Severity Key Clause Extracted Value Required Value Verdict
F-001 CRITICAL DNV-ST-0378 §7.3.4 12 mm 14 mm NON-CONFORM ✗
F-002 CRITICAL DNV-ST-0378 §6.4.2 absent 500 kN NON-CONFORM ✗
F-003 MAJOR DNV-ST-0378 §5.2 S355 S355J2 NON-CONFORM ✗
F-004 MINOR ISO 2768-m §3.1 ⌀82 (no tol.) H11 class NON-CONFORM ✗
F-005 MINOR DNV-OS-D101 §4.3.1 absent State CA NON-CONFORM ✗
F-006 INFO DNV-ST-0378 §8.4.2 MT 100% MT 100% ACCEPTABLE ✓
Leide AI Verification Statement

This report was generated by the Leide AI Drawing Review Engine. Every finding in this report cites the specific clause, section, and table from the applicable standard that the drawing fails to meet — no findings are inferred or approximate. All AI-extracted values were taken directly from the uploaded drawing file and are traceable to their source location (section view, note, BOM row, or title block).

The report has been reviewed by a Leide verification layer cross-checking clause references against the current edition of each standard. Engineers are encouraged to verify critical findings directly against the cited clauses before issuing any formal non-conformance report.

Generated by:
Leide AI Drawing Review Engine
LDRA-PAD-0001 · Rev. 0 · 2026-04-06
Applicable standards version:
DNV-ST-0378:2023 · NORSOK N-001:2012
EN 10025-2:2019 · ISO 2768:1989
DNV-OS-D101:2021 · AWS D1.1:2020
Every finding in this report cites the source clause, chapter and verse. No assumptions — full traceability from drawing to standard.