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GB/T 6986-2014 English PDF (GBT6986-2014)

GB/T 6986-2014 English PDF (GBT6986-2014)

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GB/T 6986-2014: Standard test method for cloud point of petroleum products

This Standard specifies two test methods, namely, manual and automatic methods, for cloud point of petroleum products, biodiesel and biodiesel fuel blend. The manual method is deemed as the arbitration method.
GB/T 6986-2014
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 75.080
E 30
Replacing GB/T 6986-1986
Standard test method for cloud point of
petroleum products
ISSUED ON. FEBRUARY 19, 2014
IMPLEMENTED ON. JUNE 01, 2014
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1. Scope ... 5
2. Normative references ... 5
3. Terms and definitions ... 6
4. Summary of methods ... 7
5. Method application ... 8
6. Sampling and preparation of samples ... 8
7. Manual method ... 8
8. Automatic method ... 13
9. Result expression ... 17
10. Accuracy and deviation ... 17
11. Report ... 19
Foreword
This Standard is drafted in accordance with the rules specified in GB/T 1.1-2009. This Standard replaces GB/T 6986-1986 Standard Test Method for Cloud Point of Petroleum. Compared with GB/T 6986-1986, the main technical changes are as follows. -- The title is changed into Standard Test Method for Cloud Point of Petroleum Products;
-- Applicable scope is widened; add biodiesel and biodiesel fuel blend (see Chapter 1);
-- Add requirements for sample chroma, that is, the chroma shall be no more than 3.5; samples with chroma exceeding 3.5 can also be tested according to this Standard, however, the precision is not applicable (see Chapter 1);
-- Add automatic method (see Chapter 1, 8, 9.2 and 10);
-- Add the explanation that the manual method means the arbitration method (see Chapter 1);
-- Add ?€?normative references?€? (see Chapter 2), ?€?terms and definitions?€? (see Chapter 3); ?€?method application?€? (see Chapter 5), and ?€?report?€? (see Chapter 11); -- Add the explanation that the humidity shall not be more than 75% during the testing process (see 6.3);
-- Add GB-36, GB-37 and GB-38 temperature gauges that conform to the
requirements of GB/T 514 (see 7.1.1);
-- Requirements for test tube?€?s inner diameter and the volume at the scale mark are different;
-- Description of casing tube is different;
-- Add the treatment process of sodium sulfate dehydrating agent (see 7.2.1), and requirements and processing procedures of filter paper (see 7.2.2);
-- Cooling bath temperature control is slightly changed;
-- There are some changes in transition temperature of samples in cooling bath; -- There are some changes in precision.
This Standard is redrafted by referring to ASTM D2500-11 Standard Test Method for Cloud Point of Petroleum Products. Main technical differences between this Standard and ASTM D2500-11 are as follows.
-- Add automatic method which is in accordance with ASTM D5771-12 Standard Test Method for Cloud Point of Petroleum Products (Optical detection
classification cooling method) (see Chapter 1, 8, 9.2 and 10);
-- Change the reference standards into current national standards and industry standards in China in the ?€?normative references?€? (see Chapter 2);
-- Add corresponding terms and definitions (see Chapter 3.3, 3.5 and 3.6); -- Add the explanation that the humidity shall not be more than 75% during the testing process (see Chapter 6.3);
-- Add GB-36, GB-37 and GB-38 temperature gauges that conform to the
requirements of China?€?s GB/T 514 (see 7.1.1);
-- Add requirements for the volume at the test tube?€?s scale mark (see 7.1.2); -- Add the specifications and requirements for reagent, material and cleaning solvent (see 7.2 and 8.2);
-- Add the treatment process of sodium sulfate dehydrating agent (see 7.2.1), and requirements and processing procedures of filter paper (see 7.2.2).
This Standard was proposed by National Technical Committee of Petroleum Products and Lubricant Standardization (SAC/TC 280).
This Standard shall be under the jurisdiction of Petroleum Fuel and Lubricant Branch of National Technical Committee of Petroleum Products and Lubricant Standardization (SAC/TC 280/SC 1).
Drafting organizations of this Standard. SINOPEC Maoming Company.
The participating drafting organizations of this Standard. SINOPEC Lubricant Maoming Company, Lanzhou Lubricant Research and Development Center of PetroChina Co Ltd., SINOPEC Zhenhai Refinery and Chemical Company, SINOPEC Lubricant Shanghai Company, MaoMing Entry-Exit Inspection and Quarantine of the PRC, and SINOPEC Lubricant Beijing Research and Development Center.
Main drafters of this Standard. Dang Chenxia, Wang Xuemei, Pan Xiaoxia, Huang Hongxia, Gao Yun, Li Ling, Liang Yuquan, and Cui Hai?€?ou.
Previous version replaced by this Standard is as follows.
-- GB/T 6986-1986.
Standard Test Method for Cloud Point of
Petroleum Products
Warning. This Standard involves certain dangerous materials, operations and equipment, however, it does not put forward suggestions on all safety problems involved. Therefore, proper safety and protection measures shall be
established before the users apply this Standard in practice, and the
applicability of relevant rules and regulations shall be determined.
1. Scope
This Standard specifies two test methods, namely, manual and automatic methods, for cloud point of petroleum products, biodiesel and biodiesel fuel blend. The manual method is deemed as the arbitration method.
This Standard only applies to testing cloud point of petroleum products, biodiesel and biodiesel fuel blend of which the cloud point is less than 49??C when it is transparent at the thickness of 40 mm.
Note. Chroma of samples tested in accordance with this Standard shall be ???3.5 (according to GB/T 6540); samples with chroma exceeding 3.5 can also be tested according to this Standard, however, the precision is not applicable.
2. Normative references
The following documents are indispensable for application of this document. For the dated documents so quoted, only dated versions apply to this document. For the undated documents so quoted, the latest versions (including all modification sheets) apply 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 colour
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 Technical specification and reference table for industrial platinum thermal resistance (JB/T 8622-1997, neq IEC 751.1983)
3. Terms and definitions
Following terms and definitions apply to this Standard.
3.1 Biodiesel
It is a kind of fuel derived from vegetable oil or animal fat, and it is composed of long-chain fatty acid mono-alkyl ester, expressed by BD100.
Note. Typical biodiesel is a kind of monoester produced in the reaction BETWEEN vegetable oil or animal fat AND alcohol (e.g. methyl alcohol or ethyl alcohol) by using catalyst. The fuel may include up to 14 different fatty acids, and the fatty acid methyl ester (FAME) that is transformed through chemical reactions.
3.2 Biodiesel fuel blend
It is a blend of biodiesel and petroleum distillate fuel, expressed by Bxx. In which, xx means the volume percentage of biodiesel.
3.3 Distillate fuels
It refers to the atmospheric or vacuum distillate oil and their product fuels, obtained through primary processing or second processing.
3.4 Cloud point
It means the highest temperature at which the clear-transparent liquid petroleum products, biodiesel and biodiesel fuel blend APPEAR in foggy or turbid state at the first time under the specified conditions because of the appearance of wax crystals. It is expressed by ??C. Note 1. For many observers, wax crystal looks like a cloud in white or milky turbid spots, which wins the name for it. When the sample?€?s temperature decreases to a certain degree, wax crystal will form, and turbid state will appear. For many samples, the crystal first appears at the lower part around the wall of the test tube with the lowest temperature. The difference of sample nature will result in different sizes and positions of crystal and turbidity at the cloud point. Some samples will form large and easy-to-observe crystals, while others form crystals method or through continuous monitoring of optical system. The highest temperature, at which wax crystal first appears at the bottom of the test tube and presents fog or turbid state, is the cloud point of the sample, expresse...

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