This standard specifies the type, size, technical requirements and relevant use regulations of threaded steel pipe flanges (American system). This standard applies to threaded steel pipe flanges with nominal pressure PN 2.0 MPa (Class 150) ^ -5.0 MPi (Class 300). HG 20620-1997 Threaded Steel Pipe Flange (American System) HG20620-1997 Standard download decompression password: www.bzxz.net

Threaded steel pipe flange
(American system)
HG 2062097
1 Subject content and scope of application
This standard specifies the type, size, technical requirements and relevant specifications of threaded steel pipe flanges (American system). This standard is applicable to threaded steel pipe flanges with nominal pressure PN2.MPa (Class150) ~ 5.0MPa (Class300). Thread 353
GB 7306
GB/T 12716
HG20615
HG20624
IIG20625
HG 20634
HG20635
Referenced standards
《Pipe threads sealed with threads》
《60° tapered pipe threads》
Types and parameters of steel pipe flanges (American system)》Technical conditions for steel pipe flanges (American system)》《Pressure-temperature grades of steel pipe flanges (American system)》《Fasteners for steel pipe flanges (American system)》《Selection regulations for steel pipe flanges, gaskets and fasteners (American system)》3 Flange types
3 .0.1 Flange sealing types include raised face (RF) and flat face (FF). Their sizes and selections are in accordance with the provisions of Section 6 and Chapter 8 of HG20615. The raised face flange's convex height f is included in the flange thickness C. 3..2 The applicable low square and diameter ranges of various flange types are in accordance with the provisions of Table 3.0.2. The applicable range of Table 30.2 is as follows: Close fitting type Raised face (R) Nominal force FN, MPa (class 150) NN15--.150 fClass 3uo) Flange size The size of the flange is in accordance with the provisions of Figure 4-1 and Table 4-1~2. Table 1-1PN2.0MPa (Class 150) Threaded pipe flange table 42PN5.0MPa (Class300) Threaded steel pipe flange N
Flat face (FF)
Raised face (RF)
Threaded steel pipe flange (T push)
Raised face (RF)
Nominal diameter: Flip pipe
21/2:65
Nominal diameter
PN2.0MPa (Clas5150) Threaded steel pipe flange table| |tt||Connection end
Bolt hole
Bolt hole
Center circle diameter
Table 4-2
Flange neck,
Flange principle
Theoretical weight
PN5.UMPn (CIass300) Threaded steel pipe flange connection size
Outer diameter Flange bolt inspection hole bolt flow screw guide NPSIEN
Outer diameter of the center circle
1174: 32
2 1/21 5
60,3165
135.7:280
150168.3320
Pipe thread specificationsbzxZ.net
R or NPT
(inch)
Threaded flange thread specifications
True hole diameter
! Weight · Rc or NPT
5 pipe thread
The pipe threads used for threaded flanges are divided into two types: (1) Adopting the 55 conical internal thread (Rc) specified in GB7306 (2) Adopting the 60\ conical pipe thread (NPT) specified in GB/TJ2716. 5.0.2 When 55 pipe thread is used, the outer diameter of the steel pipe used with DN150 flange should be 165.1mm. When 60° conical pipe thread is used, the outer diameter of the steel pipe used with DN65 flange should be 73mm: the outer diameter of the steel pipe used with DN125 flange should be 141.3mm. 358
Technical requirements
The technical requirements of flanges shall comply with the provisions of HG20624, and the maximum non-impact working pressure
The public pressure of flanges and the maximum non-impact working pressure at different temperatures shall comply with the provisions of HG20625. 8 Fastener length
The length of the fasteners (bolts, studs) used shall comply with the provisions of Appendix A of HG20634. Matching regulations
The matching of flanges, gaskets and fasteners shall comply with the provisions of HG20635. 10 Marking
The marking of flanges shall comply with the provisions of HG20615.
Additional Notes: This standard proposes the unit, the production unit and the main drafter proposes the unit: Chemical Industry Process Piping Design Technology Center Station Chemical Industry Equipment Design Technology Center Station
Editor: Chemical Industry Equipment Design Technology Center Station Main Drafter: Ying Daoyan Nujun
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