HG 21521-1995 Vertical Lifting Cover with Neck Welding Flange Manhole. Attached Figure HG21521-1995 Standard Download Decompression Password: www.bzxz.net

Vertical Lifting Cover with Neck Butt Weld Flange Manhole
HG21521-95
Subject Content and Scope of Application
This standard specifies the types, basic parameters, dimensions, technical requirements and relevant use regulations of vertical lifting cover with neck butt weld flange manhole made of carbon steel and low alloy steel.
This standard is applicable to vertical lifting cover with neck butt weld flange manhole with nominal pressure PN2.5～6.3MPa and working temperature limited to the range specified in Table 3-2 according to material category. Note: The nominal pressure and working overflow in Table 3-2 are only applicable to the pressure-bearing parts of the manhole, excluding gaskets. The nominal pressure and working temperature of the gasket should be determined according to the gasket standard.
HGJ 50—91
HGJ 51—91
HGJ 52--91
HGJ 61-91
HGJ 62-91
HGJ 63—91
HGJ 65--91
HG1 69-91
HGJ 70—91
HGJ 71-91
HGJ 72--91
HGJ 74--91
HGJ 75-91
GB 91-86
GB 95--85
GB 4186
HG 21514-95
Referenced standards
《Raised face butt welding steel pipe flange with neck》
《Concave and convex face butt welding steel pipe flange with neck》
《Steel pipe flange with groove face butt welding steel pipe flange》
《Steel pipe flange with neck butt welding steel pipe flange》
《Steel pipe flange with ring joint face butt welding steel pipe flange》
《Steel flange cover with raised face》
《Steel flange cover with groove face》bzxz.net
《Steel flange cover with ring joint face》
《Asbestos rubber sheet gasket for steel pipe flange》
《Flexible graphite composite gasket for steel pipe flange》
《Steel pipe flange with asbestos rubber sheet gasket》 "Polytetrafluoroethylene coated gaskets for flanges" "Spiral wound gaskets for steel pipe flanges"
"Metal ring gaskets for steel pipe flanges"
"Fasteners for steel pipe flanges"
"Split pins"
"Flat washers, Grade C"
"Type I hexagonal nuts, Grade C"
"Types and technical conditions for manholes and handholes made of carbon steel and low alloy steel",
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. 12
MFM type
Standard number
1HGJ6165—91
[HGJ69--72-91
HGI 74 --.91
3JHGJ50~53-91
HGI 75—91
HGJ 75—91
GB41—86
GB 9585
Flange cover
Asbestos rubber sheet gasket
Flexible graphite composite gasket
PTFE coated gasket
20 (forging)
Nut M20.
Washer 20
Seamless steel pipe
Support plate
16MnDR
Forging)
Spiral wound gasket
Metal ring gasket
(forging)
35CrMoA
Note: Class I material, b,>48mm flange cover uses 16MnD forgings. 72
Asbestos rubber sheet pad
Flexible graphite composite pad
PTFE coated pad,
16Mn (forging)
30CrMoA
16MnDR
Q235-A·F
Q235—A·F
Q235-AF
Q235-AF
Q235-A·F
Q235--A·F
Table 3—1
15CrMoR
Spiral wound pad
Metal ring pad
15CrMo
(forging)
40C r135CrMoA
30CrMoA
[15CrMoR
Material type
Maximum non-impact working pressure at working temperature
30>-20~0
1V16.36.3
20100150
Maximum non-impact working pressure
Table3~2
30035014004251450475500
2.52.252.0
[1.751.50
2.0|1.75/1.50|1.250.88
2.5|2. 452. 38|2. 25/ 2. 0
2.52.45|2.382.25/2.0
2.372.282.23|2.18|2.05|1,85
2.82.42.0/1.4
13.8 13.643.5613.483.282.96
5.295.29|5.1
14.854.474.113.72
15.2915.29
4.854.474.13.72|3.152.21
6.36.3 |6.3
6.36.055.6115.4 24.85
[6.36.055.6115.4214.854.413.47][6.36.3
6.35.995.7315.6115.485.174.67 Note: ① The maximum non-impact working pressure at the intermediate temperature can be determined by interpolation according to the pressure value in this table. ② When the flange cover of this type of material is made of steel plate, its lower limit working temperature is -30℃. 73
Sealing surface type
（400）426×12398620550|240|120[480|4436|4
40360300361632
480 X 12
530X 12
600 X 12 | | tt | | 6701600/250 | 670
17301660
250119505
660585|260||tt ||610/270
1530X141495
1755/6701290
426X18|386
6701585
(400)426X12
480X12
(500)530x121500
(400)426X14|398
(450)480×14
(500)530 ×14 | ||398660
480X14:448
5501240
3853003620
300148
50/390300
Table 3-3
Diameter×length
M33X2X170
M33X2X175
M33X2X180
M36×3X205
48420|300
361161
811632
161321
300/36/20.40
120300
513160
480153
505155
500167150
400426×18386670585
280|150||tt ||1505174162
001300
3951300
39013001
400|300/48/20
701395
M36X3X210
M36X3X215
M39X3X225
M45 X 3 X 245
M33X2X170
M33X2>
M33X2X180
M36X3X210
M33×2X170
M33X2X175
M33X2X180
M36X3X210
M36X 3X215
M39X3X225
M39x3 7
Total mass|| tt||M36X3X235 1338
M36X3X240
M39 X 3 X 260
Note: ① The manhole height H is determined by the diameter of the container being no 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. ② The nominal diameters in brackets in the table should not be used as much as possible. 74
Technical requirements
The technical requirements for manholes shall comply with the provisions of Chapter 4 "Technical Conditions" in HG21514. 75
Marking example
Nominal pressure PN2.5 , nominal diameter DN450.H-250, RF type sealing surface, using V-type materials, the outer ring material of the gasket is low carbon steel, the metal belt is 0Cr19Ni9, the non-metallic belt is flexible graphite, and the vertical hanging of the C-type spiral wound gasket The specified marking symbol for the manhole with neck welding flange is: manhole RFV (WC-122 0)450-2.5HG21521--95H-280 (non-standard size) The specified marking symbol is: Manhole RF (W·C-1220) 450-2.5H, 280HG21521--9576||tt ||Month Proposal unit, editor-in-chief unit
Additional notes
And main drafters
Proposal unit: Equipment Design Technology Center Station of Ministry of Chemical Industry Editor-in-chief: China Tianchen Chemical Engineering Company Main Drafted by: Li Wenren
Zhao Cheng and Shen Pengfei
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