GB/T 26985-2018Standard test method for pour point of crude oils (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 26985-2011 "Determination of crude oil pour point", compared with GB/T 26985-2011, except for editorial modifications The main technical content changes are as follows.

--- Added normative reference document GB/T 27867 (see Chapter 2);

--- Removed calcium chloride crystals (see 5.8 of the 2011 edition);

--- Increased the choice of electronic thermometers (see 6.1.2);

--- Revised the contents of the commonly used mixed refrigerants in Table 2 (see Table 2, Table 2 of the 2011 edition);

--- Removed quality assurance and control (see Chapter 11 of the 2011 edition);

--- Amend Appendix A to be a normative appendix.

1 Scope

This standard specifies the method for determining the pour point of crude oil, including the determination of the highest (upper) pour point and the lowest (lower) pour point.

This standard applies to crude oil with a pour point of not less than -36 ° C and a water content (mass fraction or volume fraction) of not more than 0.5%.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

Technical conditions for GB/T 514 glass liquid thermometer for petroleum product testing

GB/T 4756 petroleum liquid manual sampling method

GB/T 27867 automatic sampling method for petroleum liquid pipeline

3 Terms and definitions

The following terms and definitions apply to this document.

4 Principle of the method

After the sample was preheated, it was cooled at a prescribed rate, and the flow characteristics of the sample were observed at intervals of 3 °C. Will observe the most able to flow the sample The low temperature value is recorded as the pour point of the sample.

5 Reagents or materials

Caution - 5.1~5.4 Reagents are flammable and may cause fire and steam.

5.1 Acetone. Industrial grade.

5.2 Ethanol. Industrial grade.