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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

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

Requires sign-off by Responsible Engineer

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

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

Abbreviation	Definition
ALS	Accidental Limit State
BOM	Bill of Materials
CC	Consequence Class (per DNV-ST-0378 Table 2-1)
FPSO	Floating Production Storage and Offloading
HAZ	Heat-Affected Zone
NDT	Non-Destructive Testing
SWL	Safe Working Load
ULS	Ultimate Limit State
WPS	Welding Procedure Specification

1.3 Nomenclature

Symbol	Description	Unit
a	Fillet weld throat size (design)	mm
a_min	Minimum permissible weld throat per standard	mm
d_h	Padeye hole diameter	mm
d_p	Connecting pin diameter (shackle or swivel)	mm
F_proof	Required proof test load	kN
SWL	Safe Working Load (design)	t
t_p	Padeye plate thickness	mm

1.4 Codes and Standards

Ref.	Standard	Title	Edition
[1]	DNV-ST-0378	Standard for Offshore and Platform Lifting Appliances	2023
[2]	NORSOK N-001	Integrity of Offshore Structures	2012
[3]	EN 10025-2	Hot Rolled Products of Structural Steel — Technical Delivery Conditions	2019
[4]	ISO 2768-m	General Tolerances — Tolerances for Linear and Angular Dimensions	1989
[5]	AWS D1.1	Structural Welding Code — Steel	2020
[6]	DNV-OS-D101	Marine and Machinery Systems and Equipment	2021

2 Drawing Information

Parameter	Value	Source
Drawing number	FPV-STR-DWG-4850	Title block
Revision	B	Title block
Drawing title	Padeye Assembly — Deck B Lifting Points PL-4850-01 & 02	Title block
Design SWL	25 t (each padeye)	Note 1
Padeye plate thickness (t_p)	30 mm	Section A-A
Hole diameter (d_h)	82 mm	Detail B
Material callout	S355 (sub-grade not specified)	BOM, item 1
Weld throat size	12 mm (all fillet welds)	Weld symbol, Section A-A
Proof load callout	Not stated	Notes — absent
Corrosion allowance	Not documented	Notes — absent
NDT requirement	MT 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.

3 Executive Summary

⚠ Drawing does not comply — 2 critical non-conformances identified

Critical

Major

Minor

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	a_min = 14 mm	DNV-ST-0378 §7.3.4	NON-CONFORM
F-002	CRITICAL	Proof load not specified on drawing	— (absent)	F_proof = 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	d_h = 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 t_p > 25 mm	DNV-ST-0378 §8.4.2	ACCEPTABLE

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

a_min = 0.7 × t_p,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 t_p = 30 mm and the deck plate at t = 20 mm (as noted in BOM item 3), a_min = 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

F_proof = 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 t_p = 30 mm, or "S355K2" if Charpy test temperature requires it. Confirm with materials engineer.

F-004

Hole Diameter — Tolerance Class Not Called Out

MINOR

Location on drawing

Detail B (padeye hole, plan view)

AI-extracted value

d_h = ⌀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 (t_p = 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.

6 Conclusions and Recommendations

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.
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 × t_min = 0.7 × 20 mm = 14 mm. Confirm WPS adequacy for revised throat size.
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.
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.
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 ✓

Advisory Statement

This report was generated by the Leide AI Drawing Review Engine using automated analysis against the standards listed in Section 1.4. Each finding includes a clause reference indicating the specific requirement the drawing may fail to meet. AI-extracted values are taken from the uploaded drawing file; extraction accuracy depends on drawing quality and legibility.

This report does not substitute for independent engineering review. All findings — particularly CRITICAL and MAJOR items — must be verified by a qualified structural engineer against the cited clauses before issuing any formal non-conformance report or proceeding to fabrication.

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