HG 21525-1995 Normal pressure rotary handle quick opening manhole. Attached picture HG21525-1995 standard download decompression password: www.bzxz.net

Normal pressure rotary handle quick opening manhole
HG21525 ---95
1 Subject content and scope of application
This standard specifies the type, size, technical requirements and relevant use regulations of carbon steel normal pressure rotary handle quick opening manhole. This standard is applicable to normal pressure rotary handle quick opening manhole with no impact working pressure less than 0.07MPa, working temperature lower limit 0℃ and upper limit 60~200℃.
Note: The local limit working temperature is determined by the material type of the selected rubber sealing gasket. 105
GB 91—86
GB 6179--86
GB 97.1-85
GB 5781--86
GB 96—85
GB 41-86
GB 882-86bZxz.net
HG21514—95
《Split pin》
Referenced standard
《Type I hexagonal slotted nut, grade C》
《Flat washer, grade A》
《Hexagon head bolt, full thread, grade C》
《Large washer, grades A and C》
《Type I hexagonal nut, grade C》||tt ||《Pin》
《Types and Technical Conditions of Manholes and Handholes Made of Carbon Steel and Low Alloy Steel》.
Types and Dimensions
For the types and dimensions of manholes, please refer to the following figure and the provisions of Table 31 to Table 3-210
(Length of Crossbeam
Standard No.
GB91-86
GB617986
GB 97.1 - 85
GB 5781-86
GB 96—85
GB41-86
GB 882 -- 86
GB 91-86
GB 97.1 85
Details
Pin 6.3×65
Nut M36
Cover
Washer 36
Bolt M10×20
Washer 24
Nut M24
Pin B25×100
Pin 6.3×40
Washer 24
Q235-A·F
Low carbon steel
Q235-A
Q235--A·F
Rubber sheet (smooth surface)
Q235-A·F
25 (forging)
Q235-A·F
25 (forging)
Q235-A·F
1Q235A
Low carbon steel
1140HV
Note: Part No. 1 in the table only indicates the material of the cylinder section and welding ring in the cylinder component, and the material of the lug is 20 (forging). Size table
Nominal diameter
Table 3-1
Table 3-2
Total mass
Note: The height H of the manhole is determined based on the container diameter being not less than twice the nominal diameter of the manhole; if there are special requirements, changes are allowed, but the changed H dimension must be noted and the total mass of the manhole must be corrected. 108
Technical requirements
The technical requirements for manholes shall be in accordance with the provisions of Chapter 4 "Technical Conditions" in HG21514. 109
Marking example
The normal pressure rotary handle quick-opening manhole with a nominal diameter of DN450, H1=160, and 2709 acid- and alkali-resistant rubber sheet gasket has the specified marking symbol:
Manhole (R· A-2709)
450HG21525-95
The above example of manhole with Hi=180 (non-standard size) has the specified marking symbol: 人(RA—2709)
450H,=180HG21525-95
Additional Notes
The proposed unit, the chief editor
and the main drafters of this standard
Proposed unit: Equipment Design Technology Center Station of Ministry of Chemical Industry Chief editor: China Tianchen Chemical Engineering Company Main drafters: Li Wenren Zhao Chenghe Shen Pengfei 111
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