HG 21524-1995 Horizontal Lifting Cover with Neck Welding Flange Manhole. Attached Figure HG21524-1995 Standard Download Decompression Password: www.bzxz.net

Horizontal lifting cover with neck butt welding flange manhole
HG 21524-95
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 butt welding flange manhole made of carbon steel and low alloy steel.
This standard is applicable to horizontal lifting cover with neck butt welding 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 temperature 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 corresponding gasket standard.
HGJ 50—91
HGJ 52—91
HGJ 53--91
HGJ 61--91
HGJ 62-- 91
HGJ 65-91
HG J 69--91
HGJ 70 - 91
HGJ 71—91
HGJ 72-91
HGJ 74-91
HGJ 75—91
GB 91—86
GB 95-85
GB 41-86
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》
《Grooved face butt welding steel pipe flange with neck》
《Ring joint face butt welding steel pipe flange》
《Raised face steel flange cover》
《Grooved face steel flange cover》
《Ring joint face steel flange cover》
《Asbestos rubber sheet gasket for steel pipe flange》
《Flexible graphite composite gasket for steel pipe flange》
《Steel flange with neck》 "Polytetrafluoroethylene coated gaskets for pipe 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"..
Types, basic parameters and dimensions
The types, basic parameters and dimensions of manholes are shown in the figure below and the provisions of Tables 31 to 3-3. 10 | | tt |
GB 41—86
Cylinder section 1
Gasket 1
Flange cover
20 (forging)
Asbestos rubber sheet gasket
Flexible graphite composite gasket
PTFE coated gasket
Supporting plate
Note: For materials of this type, flange cover with bz>48mm uses 16MnD forgings. 98
16MnDR
(forging)
Spiral wound pad
Metal ring
16MnDR
(forging)
40Cr35CrMoAl
30CrMoA
16Mn(forging)
Asbestos rubber sheet pad
Flexible graphite composite pad
PTFE coated pad
Q235-A+F
Q2 35-A·F
Q235--AF
Q235--A·F
16MnDR
Table 3—1
15CrMoR
15CrMo
(forging)
Spiral wound gasket
Metal ring gasket
15CrMoR
35CrMoA
30CrMoA
15CrMoR
-- -- --
Shock-free working pressure table at working temperature
Maximum shock-free working pressure
2.01.751.501.250.88
[2.382.25
12. 452. 382.252.0
Table 3—2
2.232.182.051.85
2.52.372.282
5.295.295.295.1
5.295.295.1
16.055.61
3.64 13.563 | | tt | | 3.4813.282.96 | | tt | | 3.723.152.21 |67
Note: ①The maximum non-impact working pressure at the intermediate temperature can be determined by interpolation according to the pressure value in this table. ②When the flange cover of type material is made of steel plate, its lower limit working temperature is -30℃. 99
Sealing surface type
Ring connection surface (
426X12
398/620550|300
450670|600/320214
480×12
530X12|500730
6001845
600X12
426X14
480X 14 | | tt | 0
595890
398620||t t||4501670
530X121500
340213
7301660
426×14
13986601585
530X14
426×18||tt| |426X12
480X12
(500) (530X12 | 951755www.bzxz.net
320|215
340219
360225
585350
550300205
660|3402
610/340
6703602 25
386|670585350227
426X12/398
620/550/300
480×12450670600320
426X14
480×14
426×18
398660
4481685
386670585350240
Stud nut
4304820
495/48
Qiu3—3
Diameter×length
M33X2X17 0
M33X2X175
M33X2X180
M36X3X205
M36X×3X210
M36X3X215
M39X3X225
M45X3X245

M33X2X175
M33X2X1801315
M36X3X210
M36X3X215
M39X3X225
M39X3X235
M33×2X170|| tt||M33X2X175
M33X2X180
M36X3X210
M36X3X215
M39X3X225
M39×3X235
M33×2×195
M33X2X200
M36X3X235
M36X3X240
M39X3X260
Note: ① The height H of the manhole is determined by 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 in brackets in the table should not be used as much as possible. 100
Technical requirements
The technical requirements of manholes shall comply with the provisions of Chapter 4 "Technical Conditions" in HG21514. 101
Marking example
Nominal pressure PN2.5, nominal diameter DN450, H1=320, RF type sealing surface, V-type material, gasket outer ring material is low carbon steel, metal belt is 0Cr19Ni9, non-metallic belt is flexible graphite, C-type winding gasket horizontal lifting cover with neck butt welding flange manhole, the specified marking symbol is: Manhole RF (WC-1220) 450--2.5HG21524-95H,=350 (non-standard size) The above example manhole has the specified marking symbol: Manhole RFV (WC-1220) 450-2.5 Hi=350 HG21524-95102
Additional Notes
The proposed unit, the editor-in-chief unit
and the main drafters of this standard
Equipment Design Technology Center of the Ministry of Chemical Industry
Proposed unit:
Editor-in-chief: China Tianchen Chemical Engineering Company Main drafters: Li Wenren, Zhao Cheng and Shen Pengfei103
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