HG 21515-1995 Normal Pressure Manhole Attachment HG21515-1995 Standard Download Decompression Password: www.bzxz.net

Normal pressure manhole
HG21515-95
1 Subject content and scope of application
This standard specifies the type, size, technical requirements and relevant use regulations of carbon steel normal pressure manhole. This standard is applicable to normal pressure manholes with a non-impact working pressure of less than 0.07MPa and a working temperature lower limit of 0℃ and an upper limit of 60～200℃.
Note: The upper limit working temperature is determined by the material type of the selected rubber sealing gasket. 19
GB5781-86
GB4186
HG21514-95
Referenced standards
"Hexagon head bolts-full thread-Grade C"
"Type I hexagon nuts-Grade C"
"Types and technical conditions for manholes and handholes made of carbon steel and low alloy steel" 3
Types and sizes
The types and sizes of manholes are shown in the figure below and the provisions of Tables 3-1~2. 6
Nominal diameter
Standard number
GB5781-86
GB41-86
426×6
480×6wwW.bzxz.Net
530×6
630×6
Details
Washer=3
Nut M16
See size table
See size table
Bolts, nuts
Q235-A·F
Q235-A·F||tt ||Rubber sheet (smooth surface)
Q235-A·F
Q235--A·F
Table 3-2
Value Diameter×Length
M16×50
M16×50
M16X50
M16X55
Total mass
Note: ① The manhole height H is determined based on the diameter of the container being not less than twice the nominal diameter of the manhole; if there are special requirements, changes are allowed, but the changed H size must be indicated and the total mass of the manhole must be corrected. ② The nominal diameters with brackets in the table should not be used as much as possible. 22
Technical requirements
The technical requirements of manholes shall comply with the provisions of Chapter 4 "Technical Conditions" in HG21514. 23
Marking example
The nominal diameter DN450, the normal pressure manhole using 2707 acid and alkali resistant rubber sheet gasket, the specified marking symbol is manhole (R·A-2707) 450HG21515-95H-190 (non-standard size) The specified marking symbol of the above manhole is: Manhole (R·A-2707) 450H, = 190HG21515-95 This standard proposer, editor
Additional instructions
and main drafters
Proposing unit: Equipment Design Technology Center Station, Ministry of Chemical Industry Editor: China Tianchen Chemical Engineering Company Main drafters: Zhao Chenghe Li Wenren Shen Pengfei 25
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