HG/T 2435-1993 Glass tubes and fittings HG/T2435-1993 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2435-93
Glass Tubes and Fittings
Published on June 14, 1993
Implementation on January 1, 1994
Published by the Ministry of Chemical Industry of the People's Republic of China Subject Content and Scope of Application
2 Reference Standards
3 Terms, Symbols, Codes
4 Product Classification and Specifications
5 Technical Requirements
6 Test Methods
7 Inspection Rules·
8 Marking, Packaging, Transportation, Storage
Appendix A Test Method for Length of Spherical End Tube B. Test method for straightness
Appendix C. Diagram and dimensions of spherical end
Main data of slip-on flange
Appendix D
Appendix E
Schematic diagram of glass pipe connection
(16)
Chemical Industry Standard of the People's Republic of China
Glass tubes and fittings
Subject content and scope of application
HG/T2435--93
This standard specifies the product classification, specification and size, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage methods of borosilicate glass tubes and fittings with a nominal diameter of 15 to 150 mm. This standard applies to borosilicate glass tubes and fittings for conveying corrosive gases and liquids. (hereinafter referred to as pipes and fittings) 2 Reference standards
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Daily glass density determination method
Corrugated paper box
Laboratory glass instrument thermal shock test method Test method and classification of glass resistance to erosion by boiling mixed alkali aqueous solution Test method and classification of glass particles at 98C Instrument Test method for physical and chemical properties of glass Determination of acid resistance grade Instrument Glass product appearance defect terminology
Glass instrument internal stress test method Polarized optical measurement method 30002||tt| |Test method for average linear thermal expansion coefficient of glass 2436
Test method for pressure resistance of glass tubes and fittings
Approved by the Ministry of Chemical Industry of the People's Republic of China on June 14, 1993, and implemented on January 1, 1994
3 Terms, symbols, and codes
3.1 End: a pipe end with a special shape,
HG/T2435--93
3.2 Adjustment pad: a glass pad used to adjust the length between the two ends, 3.3do: the reference diameter of the spherical end, which is also the reference diameter for measuring the length L. 4 Product classification and specifications and dimensions
Tubes and fittings are divided into two categories according to the sealing structure: spherical end and flat end. 4.1
Tube fittings can be divided into the following categories according to their functions: adjustment pad, reducer, elbow, tee, cross and valve 4.2
Specifications and deviations of tubes and fittings.
4.3.1The length of the glass tube and its deviation shall conform to the provisions of Figure 1 and Table 1. Table 1
150175
Superior product
400500
First-class product
Outer diameter of glass tube
Superior product
First-class product
Qualified product
Qualified product
Limit deviation
Superior product First-class product Qualified product Superior product First-class product Qualified product ±2
Glass tube
Superior product
Qualified product
HG/T243593
4.3.2The outer diameter and wall thickness of tubes and fittings (except transformers) and their deviations shall conform to the provisions of Figure 1 and Table 2. Note: The thickness of the transition zone between the end and the tube (about 60~80mm) can be greater than the provisions of Table 2. 4.3.3 The straightness of the glass tube shall not be greater than 4%. 4.3.4 Adjustment pad
The length of the adjustment pad shall comply with the provisions of Figure 2 and Table 3: Type A
Xie Zhengzheng Length Worker
Type A Type B
HG/T2435-93
4.3.5 The length and deviation of the reducer shall comply with the provisions of Figure 3 and Table 4, Figure 3
25~125
20~100
Superior product
Qualified product
The wall thickness and length of the elbow and its deviation shall comply with the provisions of Figure 4 and Table 5, Figure
4.3.7 The length and deviation of the tee shall comply with the provisions of Figure 5 and Table 6, 4.3.8 The length and deviation of the cross shall comply with the provisions of Figure 6 and Table 6. 4.3.9 The length and deviation of the angle valve shall comply with the provisions of Figure 7 and Table 6. DN
Qualified products
Superior products
First-class products
Poor qualified products
Superior products
First-class products
Qualified products
2435-93
The length and deviation of the straight-through valve shall comply with the provisions of Figure 8 and Table 7. 4.3.10
3 Technical requirements
5.1 Physical and chemical properties of materials
5.1.1 The average linear thermal expansion coefficient of glass in the range of 20300℃: (3.3±0.1)×10~k-15.1.2 Density of glass: 2.23±0.02g/cm2.5.1.3 The water resistance of glass shall not be lower than Grade 1 specified in GB6582. 5.1.4 The alkali resistance of glass shall not be lower than Grade A2 100 specified in GB6580
HG/T2435-93
5.1.5 The acid resistance of glass shall not be lower than Grade 1 specified in QB513. 5.2 Performance of pipes and fittings
5.2.1 Heat resistance of pipes and fittings
5.2.1.1 Thermal shock temperature of pipes and fittings
The temperature difference of thermal shock resistance of DN<100mm shall not be less than 120℃, and the temperature difference of thermal shock resistance of DN>100mm shall not be less than 110℃. 5.2.1.2 Operating temperature of pipes and fittings
When the operating temperature of pipes and fittings is greater than that specified in 5.2.1.1, it shall be negotiated by both parties. Note: The glass specified in this standard can maintain its strength without deformation at a temperature close to its strain point (510℃). However, in fact, the upper limit working temperature of the tube should be much lower than the strain point temperature,
Superior product
First-class product
Qualified product
Note: The value of H is determined by the manufacturer,
Pressure value
HG/T2435-93
Tubes and fittingswww.bzxz.net
5.2.2 The allowable working pressure of tubes and fittings shall comply with the provisions of Table 8. 5.2.3 Internal stress: The value of the optical path difference of birefringence shall not exceed 200m/cm, 65
5.3 Defects in glass
HG/T2435-93
5.3.1 Impurities such as iron filings and rust are not allowed to exist in the glass. 5.3.2 Nodules with stress greater than that specified in Article 5.2.3 are not allowed to exist in the glass. 5.3.3 The size and number of stones in the glass are specified in Table 9. The distance between any two stones shall not be less than 50mm. 5.4 Geometric dimensions of pipes and fittings The dimensions and deviations of pipes and fittings shall comply with the provisions of Tables 1 to 7 and Appendix C. 6 Test methods Pipe length 100~150 Stone diameter No more than 3 pieces within the range of 10×10 Note: Pipe fittings and doors are measured according to pipes with L<1000mm. 6.1 The average linear thermal expansion coefficient of glass shall be measured according to ZBO Density shall be determined according to the provisions of GB5432. Stone diameter 1.0
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