GB/T 29035-2022Test method for flexible graphite ring (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 for Standardization Documents" drafting.

This document replaces GB/T 29035-2012 "Test methods for flexible graphite packing rings". Compared with GB/T 29035-2012, except for the structure In addition to adjustments and editorial changes, the main technical changes are as follows.

a) Changed the requirements for friction coefficient test equipment (see 5.1.1, 3.1.1~3.1.3 of the 2012 edition);

b) Added a schematic diagram of the friction coefficient test device (see Figure 1);

c) Added the requirements for the size of the friction coefficient test sample (see 5.2);

d) Changed the schematic diagram of the compression rebound device (see Figure 4, Figure 3 of the 2012 edition);

e) Delete the size limitation on the compression rebound test device (see 4.1.2.1, 4.1.2.2 of the 2012 edition);

f) Delete the 250°C thermogravimetric test step, modify the 450°C thermogravimetric test step, and add the 670°C thermogravimetric test step (See 7.4.1~7.4.3, 5.4.1 and 5.4.2 of the 2012 edition);

g) Changed the allowable error range of the thermal weight loss test results (see 7.5.2, 7.5.3, 5.5.2, 5.5.3 of the 2012 edition);

h) Added the determination method of sulfur content (see Chapter 8).

1 Scope

This document specifies the instruments and equipment for measuring the ring density, friction coefficient, compressibility, rebound rate, thermal weight loss and sulfur content of flexible graphite packing, Sample requirements, test procedures and calculation of test results.

This document applies to the testing of the physical, mechanical properties and sulfur content of flexible graphite packing rings.

2 Normative references

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

GB/T 1800.1-2020 Geometric Product Specifications (GPS) Linear Dimensional Tolerances ISO Code System Part 1: Tolerances, Basis of Deviation and Fit

3 Terms and Definitions

This document does not have terms and definitions that need to be defined.

4 Determination of density