HG 21518-1995 Swivel cover with neck butt welding flange manhole. Attached picture HG21518-1995 standard download decompression password: www.bzxz.net

Manhole with neck butt welding flange for swivel cover
HG 21518--95
Subject content and scope of application
This standard specifies the types, basic parameters, dimensions, technical requirements and relevant use regulations of manhole with neck butt welding flange for swivel cover made of carbon steel and low alloy steel.
This standard is applicable to manhole with neck butt welding flange for swivel cover 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 gaskets should be determined according to the corresponding gasket standards.
HGJ50--91
HGJ5191
HGJ52-91
HGJ53-91
HGJ61-91
HGJ62-91
HGJ63-91
HGJ65-91
HGJ69-91
HGJ70-91||t t||HGJ71-91
HGJ72--91
HGJ74—91
HGJ75—91
GB91-86
GB9585
HG21514-95
Reference standard
"Raised face butt-welding steel pipe flange"
"Concave and convex face butt-welding steel pipe flange" "Steel pipe flange with neck butt welding on groove surface", "Steel pipe flange with neck butt welding on ring joint surface", "Raised face steel flange cover"
"Concave and convex face steel flange cover"
"Steel flange cover with groove surface"
"Steel flange cover with ring joint surface"
"Asbestos rubber sheet gasket for steel pipe flange""Flexible graphite composite gasket for steel pipe flange""Polytetrafluoroethylene coated gasket for steel pipe flange""Steel "Spiral wound gaskets for pipe flanges"
"Metal ring gaskets for steel pipe flanges"
"Fasteners for steel pipe flanges"
"Split pins"
"Flat washers, 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 31 to 3-3. RF type
A type cover shaft ear
B type cover shaft ear
Standard number
HGJ75-91
HGI75-91
4/HGJ50~53-91
HGJ69~72-91
HGJ74-91
6/HGJ61~65-91
GB91-86
GB95-85
Flange cover
Cover shaft (1)
Flange shaft ear (1)
Flange shaft ear (2)
Cover shaft ear (2)
20 (forging)
Asbestos rubber sheet gasket
Flexible graphite composite gasket
PTFE coated gasket
Note: Class b material, >48mm flange cover uses 16MnD forgings. 46
16MnDR
40Cr35CrMoA
30CrMoA
(forgings)
Spiral wound pad
Metal ring pad
16MnDR
(forgings)
Table 3-1
15CrMoR
40Cr|35CrMoA
16Mn (forgings)
Asbestos rubber sheet pad
Soft Graphite composite pad
PTFE wrapped pad
Q235-A·F
Low carbon steel
Q235-A·F
Q235-A·F
Q235-A·F
Q235-A·F
30CrMoA
15CrMo
(forging)
Spiral wound pad
Metal ring pad
15CrMoR||tt ||Material category
Nuclear 6.36.3
Maximum non-shock working pressure at working temperatureTableWorking
Maximum non-shock working pressure
12.5|2.52.252.0[1.75|1.50
751.50|1.25/0.88
2、452.382.252.0
2.52.45|2.38|2.25|2.0
Table 3-2|| tt || 2.52.372.282.232.182,051.85 | |tt||424.854.41|3.47
5:995.735.615.485.17|4.67
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℃. 47
Sealing surface type
Connection surface (
（400)426×12398
[620|550
480×12
530×12
630×12
426×14
480×14
530X14||tt ||630 × 14 | | tt | | 426X12 | | tt | | 480X12 | |tt||480X12| | tt | -3
Diameter × Length
Total mass
[250|24|16|32|M33X2×170|200150f
0|40M33×2×175243
0|30|2040M33×2×180/302
40/M36X3×205437
4/16|32/M 36X3×210|289
40JM36X3X215
00|30|20/40/M39X3X225/418
20|40|M45X3×245/609
1632/M33X2X170
40|M33X2X 175
M33X 2X180
M36X3X21bZxz.net
40/M36X3X21
440/M39X3X225
30/16/32/M39X3X235
175
40/M 33X2X180
32M36X3X21
]
1632M3 6X3×235327
2503020|40M36×3×240363
301632M39×3X260/41
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, it is allowed to change. However, the changed H size must be indicated and the total mass of the manhole must be corrected. ? The nominal diameters in brackets in the table should not be used as much as possible. ③ The values ​​above the oblique line in the table are the total mass of the A-type cover shaft ear manhole, and the values ​​below the oblique line are the total mass of the B-type cover shaft ear manhole. 48
Technical requirements
The technical requirements of manholes shall comply with the provisions of Chapter 4 "Technical Conditions" of HG21514. 49
5 Marking example
Nominal pressure PN2.5, nominal diameter DN450, H-250. A-type cover shaft ear, RF-type sealing surface, M-type material, 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 rotating cover with neck butt welding flange manhole of C-type spiral wound gasket has the specified marking symbol: Manhole RFV (WC -1220)A450-2.5HG21518-95H, -280 (non-standard size) manhole, the specified marking symbol is: Manhole RFV (WC-1220)A450-2.5H, -280HG21518-9550
This standard proposes the unit, the editor-in-chief
Additional instructions
And the main drafter
Proposing unit: Equipment Design Technology Center Station of the Ministry of Chemical Industry Editor-in-chief: China Tianchen Chemical Engineering Company Main drafters: Li Wenren, Zhao Cheng and Shen Pengfei 51
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