GB/T 6986-2014Standard test method for cloud point of petroleum products (English PDF)

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 & Development Center of PetroChina Co Ltd.,

SINOPEC Zhenhai Refinery & Chemical Company, SINOPEC Lubricant Shanghai

Company, MaoMing Entry-Exit Inspection and Quarantine of the PRC, and SINOPEC

Lubricant Beijing Research & 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.