GB/T 6986-2014 in English

《GB/T 6986-2014石油产品浊点测定法》由TC280（全国石油产品和润滑剂标准化技术委员会）归口，TC280SC1（全国石油产品和润滑剂标准化技术委员会石油燃料和润滑剂分会）执行，主管部门为国家标准化管理委员会。
本标准规定了石油产品、生物柴油和生物柴油调合燃料浊点的手动和自动两种测定方法,手动法为仲裁方法。
本标准仅适用于测定在40mm 层厚时透明、且浊点低于49℃的石油产品、生物柴油和生物柴油调合燃料的浊点。
注:本标准所测定试样的色度为≤3.5(按GB/T6540测定),本标准也可用于色度>3.5试样的浊点测定,但本标准
的精密度不适用。

1 Scope

This Standard specifies two test methods (manual and automatic) for cloud point of petroleum product, biodiesel and biodiesel fuel blend, among which manual method is arbitration method.
This Standard is only applicable to tests for cloud point of petroleum product, biodiesel and biodiesel fuel blend that are transparent in 40mm thick layers, and with a cloud point below 49℃.
Note: the color of specimens which this Standard applies to is 3.5 or lower (according to GB/T 6540); this Standard is also used to test cloud point of specimen with a cloud point greater than 3.5, but the precisions stated in this Standard may not apply to such specimen.

2 Normative References

The following documents are essential for the application of this Standard. For the dated normative references, only the dated editions are applicable to this document. For the undated references, the latest editions of the normative documents (including all the amendments) are applicable to this document.
GB/T 514-2005 Specification for Liquid-in-glass Thermometers for Testing of Petroleum Products
GB 1922-2006 Petroleum Solvents for Paints and Cleaning
GB/T 4756 Petroleum Liquids - Manual Sampling (GB/T 4756-1998, eqv ISO 3170: 1988)
GB/T 6540 Petroleum Products - Determination of Color
GB/T 15000.3 Directives for the Work of Reference Materials (3) - Reference materials - General and Statistical Principles for Certification (GB/T 15000.3-2008, ISO Guide 35: 2006, IDT)
GB/T 15000.7 Directives for the Work of Reference Materials (7) - General Requirements for the Competence of Reference Material Producers (GB/T 15000.7-2012, ISO Guide 34: 2009, IDT)
GB 17602 Commercial Hexanes
JB/T 8622 Industrial Platinum Resistance Thermometer - Technical Specifications and Reference Tables (JB/T 8622-1997, neq IEC 751: 1983)

3 Terms and Definitions

1 Scope
2 Normative References
3 Terms and Definitions
4 Summary of Test Method
5 Method and Use
6 Sampling and Specimen Preparation
7 Manual Method
8 Automatic Method
9 Expression of Result
10 Precision and Deviation
11 Report