ISO 3015-2019 PDF

Full title and description

Petroleum and related products from natural or synthetic sources — Determination of cloud point. ISO 3015:2019 specifies a standardized laboratory optical method for determining the cloud point (the temperature at which a visible cloud of wax crystals first appears on cooling) of certain petroleum products, biodiesel blends and related lubricants that are transparent in a 40 mm layer and have cloud points below 49 °C.

Abstract

This International Standard describes the manual cooling and visual-observation test procedure used to determine the cloud point of fuels and lubricants (including diesel fuels with up to 30 % (V/V) FAME, paraffinic diesel with up to 7 % (V/V) FAME, and 100 % FAME). It specifies sample preparation, required apparatus (cloud jar, thermometer/temperature-measuring device and cooling bath), cooling rate and the protocol for recording the temperature at first appearance of a cloud.

General information

• Status: Published (International Standard).
• Publication date: April 2019 (Edition 3, published 2019‑04 / 25 April 2019 as listed by distributors).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.080 (Petroleum products in general / liquid fuels).
• Edition / version: 3 (2019).
• Number of pages: 9 (official ISO document lists 9 pages; some national adoptions may show different pagination).

Scope

ISO 3015:2019 applies to petroleum and related products that are transparent in a 40 mm test layer and have cloud points below 49 °C. Typical included products are diesel fuels (including specified biodiesel blends), paraffinic diesels within the stated FAME limits, 100 % FAME and certain lubricants. The standard focuses on a manual optical (visual) method: controlled cooling of a prepared sample and noting the temperature at which a cloud first becomes visible.

Key topics and requirements

• Principle: controlled cooling of the sample and periodic visual inspection; record the temperature at first visible cloud formation.
• Sample preparation and sampling: instructions for moisture removal, filling to the marked level in the cloud jar and referenced sampling practices. Sampling references commonly include ISO sampling standards such as ISO 3170 / ISO 3171.
• Apparatus: clear cylindrical cloud test jar (specified outside diameter and sample height mark), suitable thermometer or temperature sensor and a cooling bath capable of the required cooling rate and temperature range. Specific jar dimensions and sample height tolerances are provided in the text.
• Test conditions: specified cooling rate, observation intervals and reporting rules (including how to report cloud point temperature and test conditions).
• Reporting and interpretation: report cloud point temperature with the test conditions, any sample conditioning, and note limits of applicability (e.g., transparency and maximum cloud point). Comparative/alternative methods (such as automated or stepped-cooling methods) are available in other standards.
• Health & safety notes: where mercury thermometers or other hazardous items are mentioned, follow applicable safety/regulatory guidance; alternative temperature sensors are commonly used.

Typical use and users

ISO 3015:2019 is used by petroleum and biodiesel production and blending facilities, quality control and testing laboratories, research organisations, fuel distributors and regulatory bodies who need to determine or verify the cloud point of fuel streams and lubricants for specification compliance, cold‑weather performance assessment and product quality control. Test laboratories performing fuel conformity testing commonly adopt this method or equivalent national/adopted methods.

Related standards

Standards commonly referenced alongside ISO 3015:2019 include sampling standards (ISO 3170 / ISO 3171), related cloud‑point test methods such as ASTM D2500 and various IP (Institute of Petroleum) methods (for automatic or alternative procedures), and other fuel property standards (for pour point, cold filter plugging point, etc.). ISO 3015:2019 replaces earlier editions (for example ISO 3015:1992) and is often published as EN/ national adoptions (EN ISO 3015:2019, DIN, UNI translations).

Keywords

cloud point; petroleum products; diesel fuel; biodiesel; FAME; lubricants; cloud jar; cooling method; fuel testing; ISO 3015:2019.

FAQ

Q: What is this standard?

A: ISO 3015:2019 is an International Standard that specifies a laboratory optical method for determining the cloud point of certain petroleum and related products (including specified biodiesel blends).

Q: What does it cover?

A: It covers the manual cooling and visual-observation procedure, sample preparation, apparatus requirements (cloud jar, thermometer and cooling bath), test conditions and reporting for samples that are transparent in a 40 mm layer and have cloud points below 49 °C.

Q: Who typically uses it?

A: Test and calibration laboratories, fuel producers and blenders, refineries, quality-control personnel, certification bodies and regulators use this method for product specification testing and cold‑weather performance assessments.

Q: Is it current or superseded?

A: ISO 3015:2019 is the current edition (third edition, published April 2019). It supersedes earlier editions such as ISO 3015:1992. ISO standards are periodically reviewed; users should check national adoption notices for any subsequent updates or confirmations.

Q: Is it part of a series?

A: ISO 3015 is part of the group of petroleum‑product test standards (ISO/TC 28 outputs) addressing cold‑temperature behaviour and related test methods; related standards include pour point (ISO 3016), relevant sampling standards (ISO 3170/3171) and other cloud/pour test methods from ASTM/IP/JIS.

Q: What are the key keywords?

A: Cloud point, petroleum products, diesel, biodiesel (FAME), cloud jar, cooling bath, visual method, fuel testing, ISO 3015:2019.