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Flange Bolt Torque Pro is a browser-based engineering tool that calculates bolt torque, verifies joint integrity, and manages assembly records for flanged pipe connections.

Built across four major versions through a rigorous audit cycle, it implements the full ASME PCC-1-2019 torque formula, a class-dependent ASME B16.5 bolt database covering NPS ½”–24″ across all six pressure classes, and the complete ASME VIII Division 1 Appendix 2 dual-load gasket model — computing both the seating load (W_seat = πGby) and the operating load under pressure (W_op = π/4·G²·P + 2b·π·G·m·P) and identifying which governs.

Every ship over 400 GT is now required to meet the IMO Ballast Water Management Convention D-2 standard. The deadline passed in September 2024 — and Port State Control is checking.

Ballast Water Management Suite gives vessel operators, ship managers, and maritime compliance officers a practical, browser-based toolkit to stay ahead of inspection, plan BWMS investments, and maintain compliant record keeping — without expensive software subscriptions or class society retainers.

Features

D-2 Compliance Calculator

Know your status before you discharge.

Enter your ballast volume, BWMS system type, and source water quality. Get an instant estimated compliance assessment against D-2 discharge limits — including organism counts for organisms ≥50μm, 10–50μm, E. coli, Enterococci, and V. cholerae.

– Validated 7-digit IMO lookup from fleet registry
– Estimated treatment time based on system capacity
– Color-coded pass/fail against every D-2 parameter
– Works offline — no internet required on board

Exchange vs Treatment Decision Tool

Never second-guess a D-1 vs D-2 decision again.

Plug in your departure and arrival ports, ballast volume, and current BWMS status. Get a clear recommendation — and the math behind it.

– Automatic EU port detection (Rotterdam, Hamburg, Antwerp, and 20+ more)
– Calculates minimum exchange volume (95% or 3× tank capacity)
– Port State Control risk indicator for EU water routes
– Explains exactly what documentation you’ll need at the next PSC inspection

Maritime regulatory compliance is a moving target. Between IMO circulars, EU delegated regulations, and Paris MoU inspection regimes, staying current requires constant vigilance. Most operators discover compliance gaps during audits or, worse, after violations. NAUTILUS takes a different approach: continuous automated monitoring with real-time alerting.

What NAUTILUS Does

The system continuously tracks regulatory sources that affect maritime operations:

• IMO MEPC/MSC — Environmental and safety circulars, resolution amendments
• EU Official Journal — Delegated acts, implementing regulations (ETS, FuelEU, MRV)
• Paris MoU — Port State Control updates, inspection focus areas

When a new document appears, NAUTILUS parses it, extracts structured data, and compares it against your current compliance posture. If thresholds change, effective dates shift, or new requirements emerge, you know immediately — not during the next quarterly review.

The Recent MARPOL Annex V Amendments: A Regulatory Transformation for Small Vessels

Recent amendments adopted by the International Maritime Organization under MARPOL Annex V have reshaped the compliance landscape for commercial vessels of 100 gross tonnes and above. Adopted through IMO Resolution MEPC.360(79) and entering into force on 1 May 2024, these amendments lowered the Garbage Record Book threshold from 400 GT to 100 GT, bringing a significantly larger cohort of smaller vessels within structured regulatory oversight. The 100 to 399 GT segment represents the newly captured population — vessels that carried no such documentation obligation prior to the amendment.

This regulatory expansion has brought thousands of smaller commercial vessels into scope: fishing vessels operating under coastal fishing licences, coastal freighters serving regional trade routes, offshore support craft engaged in wind farm installation and maintenance, workboats and tugs providing port and terminal services, and small commercial operators transporting cargo across short-sea shipping routes. These vessels share a common characteristic — they were designed and crewed for operational efficiency rather than regulatory compliance infrastructure.

The consequences of inadequate MARPOL Annex V documentation have become increasingly tangible. Paris MOU, Tokyo MOU, and United States Coast Guard Port State Control data regularly identify garbage documentation deficiencies among frequently cited violation categories. The outcomes extend beyond administrative inconvenience: vessels face inspection delays, detention notices, financial penalties, and reputational damage that affects charter eligibility and insurance premiums.

The Digital Garbage Record Book has been developed specifically to address this compliance gap. It provides structured MARPOL Annex V documentation for vessels in the 100 to 399 GT segment without imposing administrative burdens incompatible with lean crewing arrangements and intermittent connectivity patterns.

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