1 Scope
This standard specifies the designation, material, technical requirements, test methods, inspection rules, marking, packaging and storage of sight glass for pressure vessels.
This standard is applicable to round borosilicate glass (hereinafter referred to as sight glass) made by tempering process for pressure vessels with working temperature not exceeding 280°C and working pressure lower than 6.4 MPa.
This standard is not applicable to the sight glass for pressure vessels with extremely hazardous and highly hazardous substance toxicity specified in HG 20660.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 1216 Outside micrometer
GB/T 1219 Indicator
GB/T 5137.2 Test methods of safety glazing materials used on road vehicles (GB/T 5137.2-2002, ISO 3538: 1999, Road vehicles—Safety glazing materials—Test methods for optical properties, EQV)
GB/T 6580 Glass—Resistance to attack by a boiling aqueous solution of mixed alkali—Method of test and classification (GB/T 6580-1997, eqv ISO 695: 1991)
GB/T 6581 Glass resistance to attack by hydrochloric acid at 100°C flame emission method or flame atomic absorption spectrometric method (GB/T 6581-1986, eqv ISO 1776: 1991)
GB/T 6582 Glass—Hydrolytic resistance of glass grains at 98°C—Method of test and classification (GB/T 6582-1996, eqv ISO 719: 1985)
GB/T 16920 Glass--Determination of coefficient of mean linear thermal expansion
HG 20660 Standard for classification on hazards of toxicity and explosion of chemical mediums in pressure vessel
JC/T 676 Test method for flexure of glass material
3 Designation
Each piece of glass shall be printed with the product designation. The designation methods are as follows:
Foreword i
1 Scope
2 Normative References
3 Designation
4 Material
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging and storage
Annex A (Informative) Dimensions, specifications and working pressure of sight glass
