HG 21531-1995 Hand hole for welding neck flange. Attached picture HG21531-1995 Standard download decompression password: www.bzxz.net

Hand holes for butt-weld neck flanges
HG·21531-95
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 butt-weld neck flanges made of carbon steel and low alloy steel.
This standard is applicable to hand holes for butt-weld neck flanges with nominal pressure PN2.5～6.3MPa and working temperature limited to the range specified in Table 3-2 according to material type.
Note: The nominal pressure and working temperature in Table 3-2 are only applicable to hand-filled pressure parts, excluding gaskets. The nominal pressure and working temperature of the gasket shall be determined according to the corresponding gasket standards
HGJ50-91
HGJ51-91
HGJ 52—91
HGJ53-91
HGJ 61--91
HGJ 62—91
HGJ 63—91
HGJ65-91
HGJ69-91
HGJ70—91
HGJ 7191
HGJ72-91
HGJ74—91
HGJ 75--91
GB 91—86
GB95—85
GB 41—86
Referenced standards
"Raised face butt-welding steel pipe flange with neck"
"Concave and convex face butt-welding steel pipe flange with neck""Style groove face butt-welding steel pipe flange" (Ring joint face butt-welding steel pipe flange with neck""Smiling face steel flange cover"
"Concave and convex face steel flange cover"
"Style groove face steel flange cover"
"Ring joint face steel flange cover"
|《Asbestos rubber sheet gasket for steel pipe flanges》《Flexible graphite composite gasket for steel pipe flanges》《Polytetraoxyethylene coated gasket for steel pipe flanges》《Wrap-around gasket for steel pipe flanges》
《Metal ring gasket for steel pipe flanges》
《Fasteners for steel pipe flanges》
《Split pins》
《Flat washers - Grade C》
《Type 1 hexagonal nuts - Grade C》
HG 21514-95
5 "Types and technical conditions for manholes and handholes made of carbon turbid steel and low alloy steel" 154
3 Types, basic parameters and dimensions
The types, basic parameters and dimensions of handholes are shown in the following figure and the provisions of Table 3-1 to Table 3-3. RF type
1. 5 3.
MFM type
Standard number
HGJ 75—91
HGJ75~91
HGJ 50~53-91
HGJ69~72-91
HGJ 74—91
HGJ61~65-91www.bzxz.net
Material drama
20 (steel pipe)
20 (forging)
Asbestos rubber sheet pad
Flexible graphite composite pad
Polyethylene coated pad
10 (steel pipe)
40C|35CrMoA
30CrMoA
(forging)
Wound pad
20 (steel pipe)
Table 3- 1
15CrMo
(steel pipe)
40Cr35CrMbA
16Mn(forging)
Asbestos rubber sheet gasket
Flexible graphite composite gasket
Metal ring gasket
16MnDR
Qin tetrafluoroethylene package pre-gasket
Q235-A+F
Maximum non-shock working pressure table at working temperature 20
Maximum non-shock working pressure
12. 52. 5 / 2. 5 12. 252. 0 /1. 75/1. 502.5
2.071.751.501.250.88
82. 252. 01. 751. 38
30CrMbA
15CrMo
(forging)
Spiral wound gasket
Metal ring gasket
15CMgR
Table 3-2
2. 52 37/2. 28|2. 23|2. 18/2. 05/1. 854. 0
5. 29[5. 29 5. 1
14. 854. 47
5. 295. 29 5. 1
3. 83. 643. 563. 483. 282. 9164.1
3.723. 152. 21
6.36.055.615.424.85
6.36.36.055.615.424.854.413.476.3
6. 3 5. 995. 73 5. 61 5. 485. 17 4. 67 Note① The maximum non-impact working pressure at intermediate temperature can be determined by interpolation method according to the pressure value in this table. ② The flange cover of type material is made of steel plate, and its lower limit working temperature is -30℃. 156
Sealing surface type
(RF type)
West convex surface
(MFM type)4.0
Rod groove surface
(TG type)
(RJ type)
（150)
159×6
159×7
159×6
273×8
159×7
159×9
300250
42 5370 | | tt | | 300250 | |tt||159×7
280200
3452801200
Stud Nut
Table 3 -- 3
Diameter×Length
M24X125
M27X140
M24X130
M24X125
M27×140
M24X130
M30X2X155
M24X125
M27×140
M24X130||tt ||M30×2×155
M24X145
M27X165
M24X150
16M30X2X175
Total mass
Note: ① The height H of the hand hole is determined based on the diameter of the container being not less than twice the nominal true diameter of the hand hole; if there are special requirements, changes are allowed, but the changed H size must be indicated 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.157
Technical requirements
The technical requirements for the production hole should comply with HC225!4. hood" technical conditions\ provisions 8
5 marking example
nominal pressure PN2.5, nominal diameter DN150, Hi=180, RF type sealing surface, using M type material, the gasket uses low carbon steel outer ring material, 0Cr19Ni9 metal belt, flexible graphite non-metallic belt, C type spiral wound gasket with neck butt welding flange hand hole, the prescribed marking symbol is:
hand holeRFV(W·C--1220)150—2.5HG21531- 95H; = 200 (non-standard size) soil manhole, the specified marking symbol is: hand hole RFV (W C-1220) 150-2.5H = 200HG21531-95159
Additional instructions
This standard proposes the unit, the editor-in-chief unit
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
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