HG 21528-1995 Normal pressure hand hole. Attached picture HG21528-1995 standard download decompression password: www.bzxz.net

Normal pressure hand hole
HG21528-95
Subject content and scope of application
This standard specifies the type, size, technical requirements and relevant use regulations of carbon steel normal pressure hand holes. This standard is applicable to normal pressure hand holes with a non-impact working pressure of less than 0.07MPa, 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. 129
GB5781-86
GB41-86
HG 21514-95
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" 4
3 Types and dimensions
The types and dimensions of handholes are shown in the following figure and the provisions of Table 3-1~2dxs
Standard number
GB5781-86
GB41-86
Nut M16
Gasket 8=3
See size table
See size table
( mm)
Table 3-1
20 (steel pipe)
Q235-A·F
Rubber sheet (smooth surface)
Q235-A·F
Q235-A·F
Table 3-2
Bolts and nuts
Diameter×length
M16X40
M16X45
Total mass
Note: The height H of the hand hole is determined based on the diameter of the container being not less than twice the nominal diameter of the hand hole; if there are special requirements, changes are allowed, but the changed H dimension must be indicated and the total mass of the hand hole must be corrected. 132
4 Technical requirements
The technical requirements for hand holes shall comply with the provisions of Chapter 4 "Technical Conditions" in HG21514. 133
Marking example
The normal pressure hand hole with a nominal diameter of DN250, H=120, and a 2707 acid- and alkali-resistant rubber sheet gasket has the specified marking symbol: Hand hole (R·A—2707) 250
HG21528-95
The above hand hole with H=140 (non-standard size) has the specified marking symbol: The standard marking symbol is: hand hole (R·A-2707) 250
Hi=140
HG21528—95
The unit proposing and editing this standard
Additional instructions
and the main drafters
Proposing unit:bZxz.net
Equipment Design Technology Center of Ministry of Chemical Industry
Editing unit: China Tianchen Chemical Engineering Company Main drafters:
Zhao Chenghe
Li Wenren
Shen Pengfei
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