HG 21517-1995 Swivel cover with neck flat welding flange manhole. Attached picture HG21517-1995 standard download decompression password: www.bzxz.net

Manhole with neck flat weld flange on swivel cover
HG21517-95
1 Subject content and scope of application
This standard specifies the types, basic parameters, dimensions, technical requirements and relevant use regulations of manholes with neck flat weld flange on swivel cover made of carbon steel and low alloy steel.
This standard is applicable to manholes with neck flat weld flange on swivel cover with nominal pressure PN1.0~1.6MPa and working temperature limited to the range specified in Table 3-2 according to material category. Note: The working temperature in Table 3-2 is only applicable to the pressure-bearing parts of the manhole, excluding gaskets. The working temperature of the gasket should be determined according to the corresponding gasket mark.
HGJ46-91
HGJ47-91
HGJ48-91
HGJ 61-91
HGI62—91
HGJ63—91
HGJ69-91
HGJ70-91
HGJ71-91
HGJ75-91
GB91-86
GB95-85
HG21514-95
Referenced standards
《Raised face with neck flat welding steel pipe flange》
《Concave and convex face with neck flat welding steel pipe flange》《Bar groove face with neck flat welding steel pipe flange》《Raised face steel method "Steel flange cover"
"Steel flange cover with concave and convex surface"
"Steel flange cover with groove surface"
"Asbestos rubber sheet gasket for steel pipe flange""Flexible graphite composite gasket for steel pipe flange""Polytetrafluoroethylene coated gasket for steel pipe flange""Fasteners for steel pipe flange"
"Split pin"
"Flat washer, Grade C"
"Types and technical conditions of 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 3-1 to 3-3. RF type
MFM type
A type cover shaft ear
B type cover shaft ear
Standard number
HGJ75—91
HGJ75—91
HGJ46~48—91
HGJ69—91
HGJ70--91
HGJ71—91
HGJ6 1~63-91
GB91-86bZxz.net
GB95-85
Nominal pressure
Flange
Cap shaft ear (1)
Flange shaft ear (1)
Flange shaft ear (2)
Cap shaft ear (2)
Details
See dimension table
See dimension table
Q235- A
Category code
20 (forging)
Table 3-1
16Mn (forging)
Asbestos rubber sheet pad
Flexible graphite composite pad
PTFE coated pad
Q235-A
Maximum non-impact working pressure gauge at working temperature Working temperature C
>-20~<0||tt ||Maximum non-shock working pressure
Q235-A·F
Q235-A·F
Low carbon steel
Q235--A·F
Q235-A·F
Q235-A·F
Q235-A·F
Note: The maximum non-shock working pressure at intermediate temperatures can be determined by interpolation according to the pressure values ​​in this table. 38
Table 3-2
Sealing surface type
(400)
480×8
530×8
630×8
426X10
Dimension table
125200262428220
615565
15025028263023 0 | |tt | 136270
350175|| tt | 0282530230
25028 2732250107 | | tt | 38|31|36|240
530 ×10715650 | 85350175
Table 3-3|| tt||Diameter×Length
M24X120
M24X125
M24X125
M27X130
M27X150
M27X150
Total Mass
2040M30×2×160
20/40M33×2×175
2 02040
241632
(500)|530×10/715650390200300423540|26011524
M24X120
M24X125
M24X125
||M27X150
2040M 30×2×160
M27X150
M27X150
2040M30X2X160
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, 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. 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. 39
Technical requirements
The technical requirements for manholes should comply with the provisions of Chapter 4 "Technical Conditions" in HG21514. 40
Marking example
Nominal pressure PN1.0, nominal diameter DN450, H, 230, A-type cover shaft ear, RF-type sealing surface, Class I material, and asbestos rubber sheet gasket for the swivel cover with neck flat welding flange manhole, the specified marking symbol is: Manhole RFI (A·G) A450—1.0HG21517-95H, = 250 (non-standard size) The specified marking symbol for the above manhole is: Manhole RFI (A·G) A450-1.0H, = 250HG21517-9541
Additional instructions
Month, this standard proposer, editor and main drafter
Proposing unit: Equipment Design Technology Center Station, Ministry of Chemical Industry Editor: China Tianchen Chemical Engineering Company Main drafters: Zhao Chenghe Li Wenren Shen Pengfei
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