MOORING_CHAIN_RIGGING_AUDIT • DNV-OS-E302 • IACS W22 • IMO CSS CODE ANNEX 13
Offshore Mooring Chain Proof Load & Rigging Audit Manual
Standardized marine engineering specification and interactive securement auditor for heavy studless/stud-link offshore mooring chain bundles: breaking loads, dynamic sea-fastening shear, and deck stopper verification.
01 Mooring Chain & Cargo Parameters
MT
02 Strength & Sea-Fastening Audit Telemetry RIGGING COMPLIANT
Minimum Breaking Load (MBL)
9,842 kN
Proof Test Load: 6,889 kN
Dynamic Sea-Fastening Shear
1,255 kN
Transverse sliding inertia
Required Deck Stoppers / Lashings
6 Units (Welded Heavy Stoppers)
Rigging Safety Factor
3.1 : 1 (Min ≥ 2.5)
Deck Footprint Pressure
4.92 MT/m²
MWS Certification Status
Approved for Ocean Tow
Sea-fastening sea-margin satisfies DNV-ST-N001 requirements. Chain stopper arrangement prevents lateral bundle shifting during 30-degree dynamic vessel roll.
IACS W22 & DNV-OS-E302 Mooring Chain Mechanical Thresholds
| Chain Grade | Yield Strength (Re) | Tensile Strength (Rm) | MBL Formula Constant (c) | Target Marine Application |
|---|---|---|---|---|
| Grade R3 | 410 MPa | 690 MPa | 0.0223 × d²(44 - 0.08d) | Standard semi-submersible drilling rig spread mooring systems. |
| Grade R4 | 580 MPa | 860 MPa | 0.0274 × d²(44 - 0.08d) | Deepwater FPSO turret mooring & Spar buoy permanent stations. |
| Grade R5 | 760 MPa | 1000 MPa | 0.0320 × d²(44 - 0.08d) | Ultra-deepwater FLNG & harsh cyclonic environment moorings. |
Deploy Precision Marine Cargo Rigging with Exspeedite
Ensure 100% compliance with Marine Warranty Surveyors (MWS). Calculate sea-fastening shear, verify cargo lashing pre-tensions, and eliminate offshore cargo shifting claims.