GB/T 3555-2022Test method for Saybolt color of petroleum products—Saybolt chromometer (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.

This document replaces GB/T 3555-1992 "Petroleum product Saybolt color determination method (saybot colorimeter method)", and compared with GB/T 3555-1992, except for structural adjustment and editorial changes, the main technical changes are as follows.

a) Added 4 terms and definitions (see 3.1~3.4);

b) Added the technical requirements for "water bath or oven", "beaker" and "funnel" (see Chapter 5);

c) sample melting temperature increased by "melting point" (see 5.2, 9.4);

d) The chapter "Reagents and Materials" has been added (see Chapter 6);

e) the chapter "Sampling" was added (see Chapter 8);

f) The preparation method of the sample has been changed (see 9.1~9.4, Chapter 7 of the 1992 edition);

g) Added description about bubbles (see 10.1.1);

h) Modified the operation procedure for the determination of the color of refined light oil and white oil samples (see 10.1.3, 8.1.3 of the 1992 edition);

i) Changed the operation procedure for the determination of the color of petroleum wax samples (see 10.2.1, 8.2.1 of the 1992 edition);

j) Changed the precision description (see 12.1.2, 12.1.3, Chapter 9 of the 1992 edition);

k) Added the deviation and its description (see 12.2);

l) Changed the requirements for instrument lighting in Appendix A (see A.1.6, A1.7 of the 1992 edition).

The previous versions of this document and its superseded documents are as follows.

--- First published in 1983 as GB/T 3555-1983, first revised in 1992;

--- This is the second revision.

Introduction

Color is an important quality characteristic of petroleum products. Color is easily observed by product users and is mainly used for production control. exist In some cases, color can be used as an indicator of the degree of refinement of the raw material. If the color range of a particular product is known, then when If the color is out of the determined range, the sample may be contaminated. However, color is not always a reliable indicator of product quality, especially in product specifications to be screened for use.

WARNING - Persons using this document should have practical experience in formal laboratory work. The use of this document may involve certain dangerous materials, equipment and operations, this document does not address all possible safety issues. It is the user's responsibility to take appropriate safety and health measures and ensure compliance with the conditions stipulated by the relevant national laws and regulations.

1 Scope

This document describes a method for determining the Saybolt color of petroleum products using a Saybolt colorimeter.

This document applies to refined petroleum products such as undyed motor gasoline, aviation gasoline, jet fuel, naphtha, kerosene, white oil and petroleum wax.

The color measurement range is from Saybot color number -16 to Saybolt color number 30.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 2539 Determination of melting point of petroleum wax by cooling curve method

GB/T 4756 Petroleum liquid manual sampling method

GB/T 27867 Petroleum liquid pipeline automatic sampling method

SH/T 0132 Petroleum wax freezing point determination method

SH/T 0229 Sampling method for solid and semi-solid petroleum products