HG 21522-1995 Horizontal cover plate type flat welding flange manhole. Attached picture HG21522-1995 standard download decompression password: www.bzxz.net

Horizontal hanging cover plate type flat welding flange manhole
HG21522-95
1 Subject content and scope of application
This standard specifies the type, basic parameters, dimensions, technical requirements and relevant use regulations of carbon steel horizontal hanging cover plate type flat welding flange manhole.
This standard is applicable to horizontal hanging cover plate type flat welding flange manholes with a nominal pressure PN less than or equal to 0.6MPa and a working temperature limited to the range specified in Table 3-2 according to the material category. Note: The working temperature in Table 32 is only applicable to the pressure-bearing parts of the manhole, excluding gaskets. The working temperature of the gasket should be determined according to the corresponding gasket standard. | |tt | 21514-95
Cited standards
"Raised face flat welded steel pipe flange"
"Raised face steel flange cover"
"Asbestos rubber sheet gasket for steel pipe flange""Flexible graphite composite gasket for steel pipe flange""PTFE coated gasket for steel pipe flange""Fasteners for steel pipe flange"
"Flat washer grade C"
"Type I hexagonal nut grade C"
"Types and technical conditions for manholes and handholes made of carbon steel and low alloy steel"Types, basic parameters and dimensions
For the types, basic parameters and dimensions of manholes, please refer to the following figure and the provisions of Tables 3-1 to 3-3dwxs
Stand number
2HGJ 45-91
HGJ69-91
3|HGJ70—91
HGJ 71-91
4HGJ 61—91
5HGJ75-91
6|HGJ 75—91
GB95-85
GB41--86
Nominal pressure
Name number
Flange cover
Gasket 20
Nut M20
Seamless steel pipe
Supporting plate
Q235-A·F
See size table
See size table
Category code
Asbestos rubber sheet pad
Flexible graphite composite pad
Poly Tetrafluoroethylene coated gasket
Q235-A
Q235-A·F
Q235-A·Fbzxz.net
Q235-A·F
Q235-A·F
Q235-A·F
Q235-A
Maximum no-shock working pressure under working overflow
Maximum no-shock working pressure
Note: The maximum no-shock working pressure at intermediate temperature can be determined by interpolation according to the pressure in this table. 82
Flexible graphite composite pad
Table 3-2
（400）426X6540495
595550
2827519836
3028520036
1530x66451600|370|322832|295|202500
1630×6755705|420|3631
36305206
Quantity diameter×length
M20X90||tt| |M20X95
Table 3-3
Diameter×Length
Total Mass
M20X115|92.0
1632M20×120
M20X95201
40|M20X125
M24X110
40M24X140
Note: ① The height H1 of the manhole is determined based on the diameter of the container not less than twice the nominal diameter of the manhole: If there are special requirements, changes are allowed, but the changed H and size must be indicated, and the total mass of the manhole must be corrected. ② The nominal true diameter in brackets in the table should not be used as much as possible. 83
Technical Requirements
The technical requirements of the manhole should comply with the provisions of Chapter 4 "Technical Conditions" in HG21514.
Marking example
Nominal pressure PNO.6, nominal diameter DN450, H, a 285, RF using Class I material, where the gasket is made of asbestos rubber sheet, the specified marking symbol is: Manhole I (A G) 450-0.6 HG 21522-95 H1 = 330 (non-standard size) of the above example manhole, the specified marking symbol is: Manhole I (A G) 450-0.6 H330 HG 21522-9585
Additional instructions
The proposed unit, the editor-in-chief
and the main drafters of this standard
Proposing unit: Equipment Design Technology Center Station, Ministry of Chemical Industry Editor-in-chief: China Tianchen Chemical Engineering Company Main drafters: Zhao Chenghe Li Wenren Shen Pengfei
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