This standard specifies the series, design parameters, installation dimensions and technical conditions of combined sight glasses. This standard is applicable to combined sight glasses directly installed on the flange interface of pipes or fittings with bolts in the chemical, petroleum, pharmaceutical, light industry, machinery and other sectors. HG 21505-1992 Combined sight glasses HG21505-1992 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
Combined sight glass
HG 21505-92
Editor: Equipment Design Technology Center of the Ministry of Chemical Industry Approval department: Engineering Construction Standard Editing Center of the Ministry of Chemical Industry
1992 Beijing
Subject content and scope of application
Referenced standards
Design parameters
Technical conditions.
Marking example
Appendix A (reference)
Appendix B (reference)
Preparation instructions
(1)
(3)
(4)
1 Subject content and scope of application
This standard specifies the series, design parameters, installation dimensions and technical provisions of combined sight glass. This standard is applicable to the chemical, petroleum, pharmaceutical, light industry, machinery and other departments, and is a combined sight glass directly installed on the flange interface of the pipe or pipe fitting with bolts. 2 Reference standards
GB3985 "Asbestos rubber sheet"
GB1804 "Limit deviation of dimensions without tolerance"; HGJ501 "Manufacture of toughened sight glass: acceptance technical conditions", SJ-6 "Manufacture and acceptance technical conditions of sight glass". Nominal diameter
DN(mm)
Nominal pressure
4 Design parameters
Nominal pressure: 0.6.1.0, 1.6.2.5MPa. Design temperature: ≥-20～200℃.
Sealing surface type and matching pipe flange standard 4.0.3
The sealing surface type of the combined sight glass connected to the pipe flange is type A (convex surface) and type B (concave and convex surface). When type B is used, the sight glass seat is convex and the pipe flange is concave.
For the standard of pipe flange for combined sight glass, please refer to Appendix A4.0.3.2
For the height H of pipe flange for combined sight glass, please refer to Appendix 4.0.23
5 Type
Type of combined sight glass: There are Type A and Type B sealing surfaces; as shown in Figure 5.0.15.0.1
5.0.2The material shall comply with the requirements of Table 5.0.2. Part No.
Mirror Seat
Pressure Ring
Mirror Glass
Limiting Gasket
OCr19Ni9
Asbestos Rubber Sheet (GB3985-83)
Tempered Borosilicate Glass①
Polytetrafluoroethylene Coated Limiting Plate
PN0.6MPa Mirror Glass, borosilicate glass is allowed, borosilicate glass should comply with SJ-6 "Manufacture and Acceptance Technical Conditions for Mirror Glass". When the mirror seat of Part No. 1 is made of materials other than those specified in this standard, it should be indicated when ordering. The dimensions of the combined mirror of PN0.6～2.5MPa are in accordance with the specifications of Table 7-1~~7-4. The allowable deviation of the center distance of the screw holes of the mirror seat and the clamping ring is as follows: 6. 0.1Www.bzxZ.net
.6.0.1.1. The allowable deviation of the center circle diameter of the screw hole and the allowable deviation of the distance between two adjacent holes is ±0.6mm,
6.0.1.2 The allowable deviation of the center distance between any two holes is ±1mm. 6.0.2 The free dimension tolerance of the machined surface shall comply with the 14th grade accuracy of GB1804-79, and the free dimension tolerance of the non-machined surface shall comply with the 16th grade accuracy requirements. 6.0.3 The sight glass for PN1.0~~2.5MPa shall comply with the provisions of HGJ501-86-0 "Technical Conditions for Manufacturing and Acceptance of Tempered Sight Glass". During assembly, the limit gasket should have a predetermined compression rate to ensure sealing. 6.0.4
After assembly, the combined sight glass should be pressure tested according to the nominal pressure level, and the pressure of the water pressure test shall be 1.5 times the nominal pressure. Tube method
Nominal diameter
Observation hole,
100205
7 size
PN0.6MPa combined sight glass
200178164
Note: Sealing surface type code:
A——Raised face
B-—Convex face (convex face)).
The following tables are the same.
Table 7-1
Weight (kg)
Nominal diameter
Gauge hole
PN1.0MPa combined sight glass
160125102
80195|160
100/215
138|120
188175
245|210
15028012402
Table 7-2
Weight (kg)
17.3117.06
Pipe flange
Nominal diameter
Chakongshan
PN.1.6MPa Combined sight glass
125|102
1160138
1801158
100|215
Table 7-3
Weight (kg)
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