HG 21523-1995 Horizontal Lifting Cover with Neck Flat Weld Flange Manhole. Attached Figure HG21523-1995 Standard Download Decompression Password: www.bzxz.net

Horizontal lifting cover with neck flat welding flange manhole
HG 21523 --- 95
Subject content and scope of application
This standard specifies the type, basic parameters, dimensions, technical requirements and relevant use regulations of horizontal lifting cover with neck flat welding flange manhole made of carbon steel and low alloy steel.
This standard is applicable to horizontal lifting cover with neck flat welding flange manhole with nominal pressure PN1.0~1.6MPa and working temperature limited to the range specified in Table 3-2 according to material category. Note: The working temperature in Table 3-2 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.
HGJ 46-91
HGI47--91
HGJ 48-91
HGJ 61-91
HGJ 62—91
HGJ 63-91
HGJ 69-91
HGJ 70--91
HGJ 7 1-91
HGJ 75- 91
GB 9585
GB 41-86
Referenced standards
"Raised face flat weld steel pipe flange with neck"
"Simulated raised face flat weld steel pipe flange with neck""Sampled grooved face flat weld steel pipe flange""Raised face steel flange cover"
"Concave and convex face steel flange cover"
"Sampled grooved face steel flange cover"
"Asbestos rubber sheet gasket for steel pipe flange""Flexible graphite composite gasket for steel pipe flange""Steel "Polytetrafluoroethylene coated gaskets for pipe flanges" "Fasteners for steel pipe flanges":
"Flat washers, Grade C"
"Type 1 hexagonal nuts - Grade C"
HG21514-95 "Types and technical conditions for manholes and handholes made of carbon steel and low alloy steel" 88
3 Types, basic parameters and dimensions
The types, basic parameters and dimensions of manholes are shown in the figure below and the provisions of Tables 3-1 to 3-3. RF type
MFM type
Stand number
HGJ46~48-91
HGJ 69-- 91
HGJ 70—91
HGJ61～63-91bZxz.net
HGJ·75-91
HGJ 75- 91
GB95-85
GB 41--86
Nominal pressure
Flange cover
Gasket 20
Nut M20
Seamless steel pipe
Support plate
See size table
See size table
Q235-A
Q235—A
Q235-A
Category code
20 (forging)
Asbestos rubber sheet pad
Flexible graphite composite pad
PTFE summer pad
Q235-A·F
Q235-AF
Q235-A·F
Q235-A*F
Maximum non-impact working temperature Working as a pressure gauge
Maximum non-impact working pressure
Note: The maximum non-impact working pressure at intermediate temperature can be determined by interpolation according to the pressure value in this table90
Table 3-1
16Mn (forging)
Table 3-2
Seal drawing type
Groove surface (
(400)1
426×8
56551533026
480X8615565355
6201380
530×8670
630×8780725
426X10580/525/335
480X10|640 585|365
530×10715650
63010|840/770
426x8.15651515|330
480×8615
5651355
530×8670
620380
426x10580525335
480x10|640|585|365
530×10/715/650/ 405 | | tt | | 426X10580525335 | 715|650|40542
290195
32300197
32290197
300[201
12901197
3630020136
4032020536
Table 3—3
Diameter×Length
M24X120
M24X125
M24X125
M27X130
M27X150
M27X150
M30X2X160
M33X2X175
M24X120
M24X125
M24X125
M27X150
M27X150
M30X2X160
M27X150
M27×150
M30X2X160
Total mass
Note: ① The height H of the manhole 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 and size must be indicated, and the total mass of the manhole must be corrected. ② The nominal diameters in brackets in the table should not be used as much as possible. 91
Technical requirements
The technical requirements of manholes shall comply with the provisions of Chapter 4 "Technical Conditions" in HG21514. 5
Marking example
Nominal pressure PN1.0, nominal diameter DN450, H, = 290, RF type sealing surface adopts straight material, and the gasket adopts asbestos rubber sheet gasket. The specified marking symbol of horizontal hanging cover with neck flat welding flange manhole is: A hole RF (A·G) 450--1.0HG215 For the above manhole with 23-95H1=330 (non-standard size), the specified marking symbol is: Manhole RFI (A·G) 450-1.0Hi-330HG21523-9593
Additional instructions
Proposer, editor-in-chief and main drafter of this standard
Proposer: Equipment Design Technology Center Station of Ministry of Chemical Industry Editor-in-chief: China Tianchen Chemical Engineering Company Main drafters, Zhao Chenghe, Li Wenren and Shen Pengfei　
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