This standard specifies the nominal diameter, nominal pressure, flange type, connection size, sealing surface size and marking of steel pipe flanges (American system). This standard applies to steel pipe flanges and flange covers with a nominal pressure PN of 2.0MPa (Class 150) to 42.0MPa (Class 2500). This standard also applies to valves, pumps, chemical machinery, pipeline accessories and equipment parts that use flanges as the connection type. HG 20615-1997 Steel Pipe Flange Types and Parameters (American System) HG20615-1997 Standard Download Decompression Password: www.bzxz.net

Types and parameters of steel pipe flanges (American system) HG 20615-97 Content and scope of application This standard specifies the nominal diameter, nominal pressure, flange type, connection size, sealing surface size and marking of steel pipe flanges (American system). This standard applies to steel pipe flanges and flange covers with a nominal pressure PN of 2.0MPa (Class 150) to 42.0MPa (Class 2500). This standard also applies to valves, pumps, chemical machinery, pipeline accessories and equipment parts that use flanges as connection types. 281
HC20553
HG 20616
HG20617
HG20618
HG 20619
HG 20620
HG20621
HG 20622
HG20623
2 Reference standards
"System for the selection of sizes of seamless and welded steel pipes for chemical piping", "Necked flat-welded steel pipe flanges (American system)", "Necked butt-welded steel pipe flanges (American system)", "Integral steel pipe flanges (American system)", "Socket-welded steel pipe flanges (American system)", "Threaded steel pipe flanges (American system)"
"Butt-welded loose sleeve steel pipe flanges (American system)", "Steel pipe flange covers (American system)"
"Diameter steel pipe flanges (American system)\Regulations.
3 Nominal diameter and outer diameter of steel pipe
This standard applies to the outer diameter of steel pipes in the international general series. The nominal diameter TN and outer diameter of steel pipes are in accordance with Table 3-1. Table 3-1
NPS(in)
Nominal diameter
Outer diameter of steel pipe
Nominal diameter
NPS(in
Outer diameter of steel pipe
Nominal diameter
|NPS(in)
Outer diameter of steel pipe
Nominal diameter
NPS(in)
Outer diameter of steel pipe
Nominal diameter and outer diameter of steel pipe
168.·3219.1
1355+6
1118:1168
Nominal pressure
Nominal positive pressure of flange IPN includes the following six grades: 2. 0MPa(Class 150), 5. 0MPa(Class 300),11. 0MPa(Class 6001,15. 0MPa(Class 900), 26.0MPa(Class00), 42.0MPa(Class2500).284
Flange type
5.0.1 Flange type According to the provisions of Figure 5.0.1 and 5.0.1, flat welding flange with neck
socket welding flange
butt welding flange with neck
threaded flange
flange cover
Figure 5.,, 1. Flange type
integral flange
Butt-weld ring loose flange
(LF/SE)
Flange type
Flat welding method with a tongue
Butt welding method with a neck
Integral flange
Socket welding flange
Threaded flange
Butt-weld ring loose flange
Flange blue
Large diameter flange
Table 5.0.1 Flange type and type code
Flange type code
Standard number
HG 20616
HG20617
HG20618
HG20619
HG20620
HG20621
HG 20622
HG20623
[--7-0'$华
81902 0H||t t ||91502 JH | s)
583[2] : 6981]
（00G
Table 5.0.2-2
UN>60mDI Large true diameter flange beauty type and applicable range Flange type
Standard number
Nominal diameter
(Class I50)
Fu Song flange (WN;
HG20623
PN.MPa(Cass)
(Class so)
(Cass 600)
(Class 900)
Sealing surface type
The sealing type of the flange shall be in accordance with Figure 6.0.1 and Table 6.0. 1 specified raised face (RF)
groove face (TG)
ring joint face RJ)
Figure Ref. 0.
Seal face type
Concave white face (MEM)
Full plane (FF)
Tide-through type
Ring joint face
Seal face type
Nominal FN, MPu ((IHSs)
(Cuss 150)
(Class soc)
DA:5--15CO
DVi:~-60C
DV23-600
(Clas* 600) + (Cless 900)
IN15-900
DN15--600
1N15-~600
DN:5~-600
(Class 1500): (Cle 2500)
1)N15 ~ 6(00 DN15~ 300
1N15--300
DN15~-300
ON15-~300
Jiangsu: PN5.0MP flange surface method, using non-gold eyebrow flat sheet, the most reported olefin-wrapped pad and case-name composite pad, can be made into dense waterline. The code is RF (A)
6.0.2 The dense surface types of various types of flanges are specified in Table 6.0.2. Table 6.02
Flange type and Sealing surface type
Flange type
With flat welding method "(Y))
With coal method\ (WN)
Integral flange (IF)
Flange cover (SW)
Welded flange (Th)
Butt welding ring loose wire (LF/SE)
Flange cover (BT.)
Vertical flange (WN)
Sealing flange type
Tufted flange (RF)||t t||Flat surface (FF)
Four hundred (MFM)
Tandara (T)
Raised surface (RF)
Connection surface (RJ)
Full plane (FF)
Surface (MFM)
Birch surface (IG)
Raised surface (RF)
Bad connection surface (R[)
Flat surface (FF)
Raised surface (MHM)
Ring connection front (RJ )
MFM）
Mixed groove surface TG
Gurn surface (RF)bzxz.net
Gold plane (FF)
Raised surface (RF)
Sinus surface (RF)
Ring joint surface (RJ)
Chuanaotu (MFM)
Xiang groove (TG)
Refreshing surface (RE)
Pressure level PN.MPatClass）
2.0(Class 150)-~26.0(Cluss 1500)2. 0(Class 150)
3.0(Class 300)--26.0(Class 1500).0(Class 300).--26.0(Clas150t)1 2.0(ClaM 150)~-42.((Ctass 2500)2.0(Cla6 15()-~42.0(Class 2500)2. 0(Clzss 150)
5. 0(Cless 300)~-12. 0(Class 250)5.0(Cless 300)-~42.0(Class 2500)2.0(Clasx 150)~-42. 0(Class 2500)2. 0(Cluss 150) ~42.0(Clags 2500)2. 0(6:s5 150)
5. 0(Class 300)~42 .C(Class 2500)5.5(Claiss 3001--42.C
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