1 Scope
This standard specifies the labeling, materials, requirements, inspection methods, inspection rules, marking, packaging, transportation and storage of borosilicate sight glasses for pressure pipelines.
This standard is applicable to sight glasses made by physical strengthening and tempering process and used for observation holes of pressure pipelines (or containers). The maximum allowable working temperature of the glass shall be not more than 280℃, and the working pressure shall be less than 5.0MPa.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 5137.2 Test methods of safety glazing materials used on road vehicles - Part 2: Optical properties tests
GB/T 6579-2007/ISO 718: 1990 Laborator glassware - Thermal shock and thermal shock endurance - Test methods
GB/T 6580 Glass - Resistance to attack by a boiling aqueous solution of mixed alkali - Method of test and classification
GB/T 6581 Glass-Resistance to attack by hydrochloric acid at 100℃ - Flame emission or flame atomic absorption spectrometric method
GB/T 6582 Glass - Hydrolytic resistance of glass grains at 98℃ - Method of test and classification
GB/T 16920 Glass - Determination of coefficient of mean linear thermal expansion
ASTM C601-85(2010) Standard Test Method for Pressure Test on Glass Pipe
3 Marking
Product labeling consists of standard number and main parameters. Marking example as shown in Figure 1: tempered borosilicate sight glass with outer diameter d1 of 100mm, thickness s of 15mm and working pressure of 2.5MPa are labeled as follows:
HG/T 4284-100×15-2.5
Foreword iv
1 Scope
2 Normative references
3 Marking
4 Requirements
4.1 Technical requirements
4.2 Appearance quality
4.3 Dimension, shape and deviation
4.4 Polarized light inspection
4.5 Light transmittance
4.6 Thermal shock resistance
4.7 Allowable working pressure
4.8 Glass material
4.9 Installation requirements of sight glass
5 Inspection methods
5.1 Appearance quality
5.2 Dimension, shape and deviation
5.3 Polarized light inspection
5.4 Visible light transmittance
5.5 Thermal shock resistance
5.6 Allowable working pressure
6 Inspection rules
6.1 Inspection classification and items
6.2 Batching rules and judgment
7 Marking, packaging, transportation and storage
7.1 Marking
7.2 Packaging
7.3 Transportation
7.4 Storage
Annex A (Normative) Basic structure and installation dimensions of cylindrical sight glass (sight cup)
Annex B (Normative) Basic structure and installation dimensions of sight glass for pressure pipeline
Figure 1 Schematic diagram of sight glass
Table 1 List of technical requirements and inspection methods
Table 2 Appearance quality requirements
Table 3 Basic structural dimensions and allowable working pressure
Figure 2 Dimension, shape and deviation
Table 4 Allowable deviation of outside diameter and thickness
Figure 3 Chamfer dimensions
Table 6 Chamfer dimension and allowable deviation
Table A. 1 Basic structural dimensions of cylindrical sight glasses
Figure A. 1 Structural diagram of cylindrical sight glasses
Figure A. 2 Structural diagram of sight cup
Table B. 1 Main dimensions of lined sight glasses
Figure B. 1 Structural diagram of sight glasses for pressure pipeline
