HG 21519-1995 Vertical cover plate type flat welding flange manhole. Attached picture HG21519-1995 standard download decompression password: www.bzxz.net

Vertical hanging cover plate type flat welding flange manhole
HG21519-95
Subject content and scope of application
This standard specifies the type, basic parameters, technical requirements and relevant use regulations of carbon steel vertical hanging cover plate type flat welding flange manhole
This standard is applicable to vertical hanging cover plate type flat welding flange manhole with nominal pressure PN less than or equal to 0.6MPa and working temperature limited to the range specified in Table 32 according to material category. Note: The working temperature in Table 3-1 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 standard.
HGJ45-91
HGJ61-91
HGJ69-91
HGJ70-91
HGJ71-91
HGJ75-91
GB95-85
GB41-86
HG21514-95
Cited Standard
《Raised Face Flat Weld Steel Pipe Flange》
《Raised Face Steel Flange Cover》
"Asbestos rubber sheet gasket for steel pipe flanges" "Flexible graphite composite gasket for steel pipe flanges" "Polytetrafluoroethylene coated gasket for steel pipe flanges" "Fasteners for steel pipe flanges"
"Flat washers, Grade C"
"Type 1 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 3-1 to 3-3. 13
Standard No.
HGJ61-91
HGJ69--91
HGJ70-91
HGI71--91
HGJ45-91bzxZ.net
HGJ75-91
HGJ75-91
GB41-86
GB95-85
Nominal Pressure
Flange Cover
Nut M20
Washer 20
Seamless Steel Pipe
Support Plate
See Dimension Table
See Dimension Table
Category Code
Q235- A
Asbestos rubber sheet pad
Flexible graphite composite pad
PTFE coated pad
Q235-A
Q235-A·F
Q235-A
Q235-A·F
Q235-AF
Q235-A·F
Q235-A·F
Q235-A·F
Q235-A·F
Q235-A·F
The maximum non-shock working pressure at working temperature
Maximum non-shock working pressure
Note: The maximum non-shock working pressure at intermediate temperature can be determined by interpolation according to the pressure value in this table. 56
Table 3-1
Flexible graphite composite pad
Table 3-2
Nominal
diameter of paste.
Quantity diameter×length
4402824283616
（400）426×6540495320250210108450480×6595|550350250220110468|30263036500530X664560037530023011249332228/3236
600630×6755|7054304002401165483631363616
M20×90
Table 3—3||tt ||Diameter×Length
Centroid
32/M20×11592.0
M20X95
1632M20×120114
2040M20X125136
M20X95
[M24×110|20|40M24×140
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 H1 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. 58
Technical requirements
The technical requirements for manholes should comply with the provisions of Chapter 4 "Technical Conditions" in HG21514. 5
Marking example
Nominal pressure PN0.6, nominal diameter DN450, Hi=220, using Class I materials, and the gasket is made of asbestos rubber sheet. The specified marking symbol is: Manhole I (A·G) 450-0.6HG21519-95Hi=250 (non-standard size) The above example manhole has the specified marking symbol: Manhole I (A·G) 450-0.6H,=-250HG21519-9559
Additional instructions
Proposer, editor
and main drafters of this standard
Proposer: 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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