HG 21529-1995 Plate type flat welding flange hand hole. Attached picture HG21529-1995 standard download decompression password: www.bzxz.net

Hand holes for plate-type slip-on flanges
HG 21529—95
Subject content and scope of application
This standard specifies the types, basic parameters, dimensions, technical requirements and relevant use regulations of hand holes for plate-type slip-on flanges made of carbon steel.
This standard applies to hand holes for plate-type slip-on flanges 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 3-2 is only applicable to the pressure-bearing parts of the hand holes, excluding gaskets. The working temperature of the gasket should be determined according to the cabinet gasket standard.
HGI 45—91
HGJ 61-91
HGJ 6991
HGJ 70-91
HGJ 71-91
HGJ 75-91
HG 21514-95
Referenced 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""Polytetrafluoroethylene coated gasket for steel pipe flange""Fasteners for steel pipe flange"
"Types and technical conditions of manholes and handholes made of carbon steel and low alloy steel"Types, basic parameters and dimensions
The types, basic parameters and dimensions of hand holes are shown in the figure below and the provisions of Tables 3-1 to 3-3. dwxs
Standard number
2HGJ 75-91
HGJ 75-91
HGJ 4591|法
HGJ 69-91
IHGJ 70-91
HGJ 71 91
See size table
FemaleSee size table
HGJ6191 flange cover
Nominal pressurebzxZ.net
20 (steel pipe)
Q235-A
Asbestos rubber sheet gasket
Flexible graphite composite gasket
PTFE wrapped gasket
Q235—A
Q235—AF
Maximum non-shock working pressure at working temperatureTable working temperature
>-20~<0
Maximum non-shock working pressure
Note: The maximum non-shock working pressure at intermediate temperatures can be determined by careful interpolation according to the pressure in this table. Size
273×8
265|225
37533524
Value diameter×length
M16X70
M16X75
Table 3-1
Flexible graphite composite pad
Table 3-2
Table 3-3
Total mass
Value diameter×length
M16X9016.7
M16X95
Note: The height H of the hand hole is determined based on the diameter of the container not less than twice the nominal diameter of the hand hole. If there are special requirements, changes are allowed, but the changed H and size must be indicated and the modification Total mass of the positive hand hole, 140
Technical requirements
The technical requirements of the hand hole shall comply with the provisions of Chapter 4 "Technical Conditions" in HG21514 141
Marking example
The plate type flat welding flange hand hole with nominal pressure PNO.6, nominal diameter DN250, H1=190, Class I material, and asbestos rubber sheet gasket, its specified marking symbol is: hand hole I (A·G) 250—0.6
HG21529--95
H一220 (non-standard size) The above example hand hole, its specified marking symbol is: hand hole (A·G) 250-0.6
H, =220
HG21529--95
Additional Notes
Proposer, Editor-in-Chief
and Main Drafters of this Standard
Proposer: Equipment Design Technology Center of Ministry of Chemical Industry Editor-in-Chief: China Tianchen Chemical Engineering Company Main Drafters: Zhao Chenghe and Li Wenren
Shen Pengfei
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