Marine Bunkering, Ship Chandling, Tug/Pilotage & Port Agency ERP: Bunker Delivery Note (BDN) ASTM Table 54B Mass-Flow Metering, Bonded Duty-Free Ship Stores & Vessel Disbursement Accounts (PDA/FDA)

Maritime port agents, licensed ship chandlers, and marine bunker suppliers operating at the Port of Mombasa (Kilindini Harbour), Lamu Port, Kisumu Inland Port, and Indian Ocean anchorages coordinate time-critical vessel turnarounds for container ships, bulk carriers, oil tankers, and offshore supply vessels. Operating on disconnected spreadsheets and email chains leads to bunker quantity disputes between ambient barge/truck litres and 15°C vacuum metric tons on the Bunker Delivery Note (BDN), customs bond penalties on duty-free ship stores and bonded spares-in-transit, and delayed Final Disbursement Account (FDA) closures that trap agency working capital for months.

At devManue, we engineer specialized Marine Bunkering, Ship Chandling & Port Agency ERP platforms that unify IMPA/ISSA ship-chandling RFQ catalogs, KRA bonded warehouse & duty-free vessel boarding tallies, ASTM D1250 Table 54B marine bunker mass-balance calculators, Statement of Facts (SOF) laytime logs, and multi-currency Pro-Forma to Final Disbursement Account (PDA / FDA) ledgers.

1. Eliminating Bunker Density Disputes, Chandling Margin Leaks & FDA Delays

• Marine Bunkering ASTM Table 54B & MARPOL Sample Seal Traceability: Marine fuels (VLSFO 0.5%S, LSMGO 0.1%S) are metered by volume or Coriolis mass-flow meter during barge or ex-pipe/truck stem delivery, but traded globally in Metric Tons in Air / Vacuum. Our bunkering module calculates exact Volume Correction Factors (VCF) at observed pumping temperature and 15°C density, prints the statutory MARPOL Annex VI Bunker Delivery Note (BDN), and records the 4 tamper-evident manifold drip-sample bottle seal numbers signed by the vessel’s Chief Engineer.
• IMPA / ISSA 6-Digit Ship-Chandling Catalog & Master’s Cash-to-Master (CTM): Maps vessel deck, engine, cabin, and provision requisitions directly to standard 6-digit IMPA / ISSA item codes, reconciles KRA Custom Bonded Warehouse releases against Customs Boarding Officer export stamps, and tracks armored Cash-to-Master (CTM) USD deliveries.
• Automated Port Tariff Pro-Forma (PDA) to Final Disbursement Account (FDA) Reconciliation: Calculates KPA port dues (pilotage, tuggage, mooring, berthage, light dues, stevedoring, KMA levies) automatically from the vessel’s Gross Tonnage (GT) and LOA, tracks shipowner pre-funding remittances, and links every vendor voucher PDF to close the FDA within days of sailing.

2. Marine Bunker ASTM Table 54B Volume-to-Metric-Ton & PDA/FDA Variance Engine

Our maritime engineering engine converts observed pumping litres of VLSFO or MGO at elevated temperature into standard 15°C volume and commercial Metric Tons (in air), while auditing PDA advance prefunding against actual FDA disbursements:

from decimal import Decimal, ROUND_HALF_UP

class MarineBunkerAndPortAgencyEngine:
    """
    Computes marine fuel Bunker Delivery Note (BDN) temperature-corrected
    Metric Tons (ASTM Table 54B approximation) and PDA-to-FDA settlement.
    """
    @staticmethod
    def compute_bdn_metric_tons_and_fda_balance(
        observed_volume_litres: Decimal,
        observed_temp_c: Decimal,
        density_at_15c_kg_m3: Decimal,
        contracted_stem_mt: Decimal,
        price_per_mt_usd: Decimal,
        owner_pda_prefunded_usd: Decimal,
        actual_fda_port_and_husbandry_vouchers_usd: Decimal,
    ) -> dict:
        # Thermal expansion coefficient approximation for marine distillates/fuel oil (~0.00068 per °C)
        temp_delta = observed_temp_c - Decimal("15.0")
        vcf_54b = (Decimal("1.0000") - (Decimal("0.00068") * temp_delta)).quantize(
            Decimal("0.0001"), rounding=ROUND_HALF_UP
        )
        volume_at_15c_m3 = (observed_volume_litres / Decimal("1000")) * vcf_54b
        # Weight in air factor (density_15c / 1000 - 0.0011 buoyancy correction)
        weight_in_air_factor = (density_at_15c_kg_m3 / Decimal("1000")) - Decimal("0.0011")
        delivered_metric_tons = (volume_at_15c_m3 * weight_in_air_factor).quantize(
            Decimal("0.001"), rounding=ROUND_HALF_UP
        )
        stem_variance_mt = delivered_metric_tons - contracted_stem_mt
        bunker_invoice_usd = (delivered_metric_tons * price_per_mt_usd).quantize(
            Decimal("0.01"), rounding=ROUND_HALF_UP
        )
        fda_balance_due_to_or_from_owner_usd = (
            owner_pda_prefunded_usd - actual_fda_port_and_husbandry_vouchers_usd
        ).quantize(Decimal("0.01"), rounding=ROUND_HALF_UP)
        return {
            "vcf_table_54b": vcf_54b,
            "delivered_bunker_mt_in_air": delivered_metric_tons,
            "stem_delivery_variance_mt": stem_variance_mt,
            "bunker_stem_invoice_usd": bunker_invoice_usd,
            "fda_net_settlement_balance_usd": fda_balance_due_to_or_from_owner_usd,
        }

3. Crew Change Husbandry, Launch Boat Hire & Hyperlinked FDA Audit Dossiers

For husbandry agents managing crew sign-on/sign-off (immigration OK-to-Board, port health, hotel/airport transfers, medical referrals, and launch-boat runs to outer anchorage), every disbursement is tagged to the vessel call and compiled into a single hyperlinked PDF Final Disbursement Account pack for instant shipowner DA-Desk approval.