ISO/TR 18588:2023 PDF

Name: ISO/TR 18588:2023 — Petroleum products — Characterization of marine fuels by viscosity-gravity constant
SKU: ISO/TR 18588:2023
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Petroleum products — Characterization of marine fuels by viscosity-gravity constant

Название (английский):

ISO/TR 18588:2023

Petroleum products — Characterization of marine fuels by viscosity-gravity constant

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 22 сентября 2023 г.
Издание:: ISO TR 18588 edition 1 version 1
ICS:: 75.160.20

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Описание (английский):

This document provides best practices on the calculation and use of an informative indicator for the characterization of fossil residual marine fuels not containing FAME as defined in ISO 8217. This document is based on established guidance used by the petroleum industry to characterize petroleum fractions in terms of their paraffinic, naphthenic or aromatic nature, by their viscosity-gravity constant.

Abstract

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Упомянутые в описании и другие стандарты ISO

Overview - ISO/TR 18588:2023, viscosity-gravity constant for marine fuels

ISO/TR 18588:2023 provides best practices for characterizing fossil residual marine fuels (excluding FAME as defined in ISO 8217) using the viscosity‑gravity constant (VGC) and the Bureau of Mines correlation index (BMCI/CI). The Technical Report documents formulas, algorithms (Annex A) and sample data analysis to indicate whether a supplied residual marine fuel (VLSFO / HSFO) is predominantly paraffinic, naphthenic or aromatic in nature. It responds to changes in the marine fuel market following MARPOL Annex VI sulfur limits and the resulting diversity of blend formulations.

Key topics and technical requirements

Scope: characterization of fossil residual marine fuels not containing FAME; no normative references.

Two characterization approaches:

BMCI (CI) - detailed correlation index using density, averaged boiling point and viscosity conversions. BMCI classification: Paraffinic (CI < 29.8), Naphthenic (CI < 57.0), Aromatic (CI > 75.0).
VGC - empirical indicator derived from density and kinematic viscosity (ASTM D2501 approach). Easier to apply to routine test data.

Important formulas and conversions:

Algorithms to convert kinematic viscosity at 50 °C to viscosities at 38 °C, 99 °C and 100 °C (used in BMCI and VGC calculations).
VGC formula using density at 15 °C and viscosity at 100 °C.

Indicative thresholds from the report and literature:

VGC ≈ 0.80 or below → paraffinic; VGC > 0.92 → aromatic. Speight ranges: paraffinic 0.74–0.75, naphthenic 0.89–0.94, aromatic 0.95–1.13.

Empirical mapping (from sample analysis): paraffinic fuels ~VGC 0.82 / density ~888 kg·m⁻3; aromatic fuels ~VGC 0.92 / density ~994 kg·m⁻3.

Practical applications and users

Who benefits:

Fuel testing laboratories - apply VGC and BMCI algorithms from routine density and viscosity tests.
Ship operators & technical managers - evaluate fuel character for combustion performance, engine tuning and compatibility.
Fuel suppliers and blenders - classify products (VLSFO, HSFO) to support matching and quality claims.
Classification societies, regulators and purchasers - use indicators to compare fuels and assess supply consistency.

Practical uses:

Rapid screening of whether a residual marine fuel is more paraffinic or aromatic.
Supporting fuel selection, blending decisions and compatibility assessments.
Complementary input to fuel handling, storage and engine performance risk assessments.

ISO/TR 18588:2023 PDF

Abstract

Похожие стандарты

Overview - ISO/TR 18588:2023, viscosity-gravity constant for marine fuels

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

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Products from petroleum, synthetic and renewable sources — Fuels (class F) — Specifications of marine fuels

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