HG 21532-1995 Swivel cover with neck butt welding flange hand hole. Attached picture HG21532-1995 standard download decompression password: www.bzxz.net

Hand holes for rotary cover with neck butt welding flange
HG 21532—95
1 Subject content and scope of application
This standard specifies the types, basic parameters, dimensions, technical requirements and relevant use regulations of hand holes for rotary cover with neck butt welding flange made of carbon steel and low alloy steel. bzxz.net
This standard is applicable to the hand holes for rotary cover with neck butt welding flange with nominal pressure PN2.56.3MPa 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 hand holes, excluding gaskets. The nominal pressure and working temperature of the gasket should be determined according to the corresponding gasket standard.
HGJ 50-91
HGJ 51--91
HGJ 52—91
HGJ 53-91
HGJ 62—91
HGJ 63-91
HGJ 65-91
HGJ 6 9-91
HGJ 70--91
HGJ 71-—91
HGJ 72—91
HGJ 74-91
HGJ 75-91
GB 91-86
GB 95-85
HG 21514-95
Referenced standards
"Raised face butt welding steel pipe flange with neck"
"Concave and convex face butt welding steel pipe flange""Grooved face butt welding steel pipe flange with neck""Ring joint face butt welding steel pipe flange""Raised face steel flange cover"
"Concave and convex face steel flange cover"
"Grooved face steel flange cover"
"Ring joint face steel flange cover"
"Asbestos rubber sheet gasket for steel pipe flange""Soft rubber gasket for steel pipe flange" "Graphite composite gasket" "PTFE coated gasket for steel pipe flange" "Spiral gasket for steel pipe flange"
"Metal ring gasket for steel pipe flange"
"Fasteners for steel pipe flange"
"Split pin"
"Flat washer 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 hand holes are shown in the figure below and the provisions of Tables 3-1 to 3-3. RF type
A type cover shaft ear
MFM type
B type cover shaft ear
Standard stall number
HGJ 75—91
HGJ 75—91
4|HGJ 50~53-91
HGJ 69~72-91
HGJ 74—91
6HGJ6165--91
GB91-86
GB 95—85
Flange cover
Cover shaft ear (1)
Flange shaft ear (1)
Flange shaft ear (2)
Cover shaft ear (2)
20 (Steel)
20 (Forging)
Asbestos rubber sheet gasket
Flexible graphite composite gasket
PTFE coated gasket
【10 (Steel pipe)
40Cr/35CrMoA
30CrMoA
(Forging)
Spiral wound gasket
Metal ring gasket
16MnDR
(Forging)
20 ( Steel pipe)
Table 3-1
15CrMo
(Steel pipe)
40Cr|35CrMoA
16Mn(Forging)
Asbestos rubber sheet pad
Flexible graphite composite pad
PTFE coated pad
Q235-A+F
Q235-AF
Low carbon steel
Q235-A·F
Q235-A·F
Q235--A·F
Q235-A·F
Note: For flange covers of M material bz>47mm, use 16MnD forgings. 164
30CrMoA
15CrMo
(forging)
Spiral wound gasket
Metal ring gasket
15CrMoR
Material type
Maximum non-shock working pressure at working temperature
Maximum non-shock working pressure
2.52.52.252.0
2.01.751.501.25
12.3812.25
1.75|1.38||tt ||Table 3-2
2.372.28|2.23|2.18|2.05|1.852.5
3.643.563.48/3.282.96
3.723.15|2.21
6.05|5.615.
6.0515.61
6.35.995.735.615.485.174.67
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 group material is made of steel plate, its lower limit working temperature is -30℃. 165
Sealing surface pressure
(RF type)
(MFM type)
(TG type)6.3(250)
(R type)
450385220
273X10252
273×10|252
273X14| 246|470
273 × 10 ||tt | 85/22 0
1470|4001230
Table 3-3
Total mass
Diameter×length
25512012
24M30X2X160
538255120
462701140
24M30X2X160
24M33X2X
M33X2X
5427014012|24M33x2X200fl
Note: ①The 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 noted and the total mass of the hand hole must be corrected. ② 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 hand holes of the A-type cover shaft ears, and the values ​​below the oblique line are the total mass of the hand holes of the B-type cover shaft ears. 166
Technical requirements
The technical requirements for the hand holes shall comply with the provisions of Chapter 4 "Technical Conditions" in HG21514. 167
Marking example
Nominal pressure PN4.0, nominal diameter DN250, H1-220, A-type cover shaft ears, RF-type sealing surface, V-type materials, where the gasket uses low-carbon steel as the outer ring material, 0Cr19Ni9 as the metal strip, flexible graphite as the non-metallic strip, and C-type wound gasket for the swivel cover butt welding flange hand hole, the specified marking symbol is: hand hole RFV (WC-1220) A250-4.0HG21532-95H, = 250 ( For the above example of manhole with non-standard size), the specified marking symbol is: Hand hole RFM (W·C—1220) A250-4.0 Ht-250 HG21532-95168
The unit proposing this standard, the editing unit
Additional instructions
and the main drafters
Proposing unit: Equipment Design Technology Center Station of Ministry of Chemical Industry Editing unit: China Tianchen Chemical Engineering Company Main drafters: Li Wenren
Zhao Chenghe
Shen Pengfei
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