,,
This standard (HG 20592~20635-97) is formulated by revising the primary standard HGJ 44~76-91 as well as HG 20527-92 and HG 20529-92 by reference to ISO 7005-1 (1992), ANSI B16.5 and DIN standards. The new standard after revision includes the international current European and American systems and forms a set of standard in allusion to pipe flange, gasket and bolting which has intact contents and clear system and is suited for Chinese conditions and gears to the international conventions. The new standard will improve the current situations of standards in this field such as disordered system, poor matchability and obsolete contents.
Thereinto, HG 20592~20614-97 belongs to European system and is formulated by revising and combining HGJ 44~76-91, HG 20527-92, HG 20529-92 and HG 5001~5028-58. Compared with the former standard, the newly revised standard has the following changes:
1. Applicable to outside diameter of steel tube, extending to international current series (A) and domestic following series (B) from domestic following series;
2. Supplemented threaded flange and integral flange and cancelled flanging ring loose flange;
3. Adjusted the pressure class range of slip-on hubbed flange and slip-on-welding flange
Slip-on hubbed flange PN0.6~4.0MPa DN≤600mm
Slip-on-welding flange PN0.25~0.6MPa DN≤2000mm
PN1.0~2.5MPa DN≤600mm
4. Revised sealing face dimensions and flange technical conditions;
5. Increased material varieties such as cast steel material and low temperature steel forging;
6. The pressure-temperature table of stainless steel was revised on the basis of 1% yield strength;
7. Adapting to two sets of steel tube outside diameter series, and adjusted and supplemented the gasket dimension;
8. Supplemented rubber, synthetic rubber and non-asbestos rubber pressboards as well as modified (filled) polytetrafluoroethylene flat washer material; revised the asbestos rubber gasket standard as standard for flat washer made of various nonmetallic materials;
9. Increased bolting length matching for various flange joints;
10. Marked the pipe flanges with the standard No. in HG 20592.
HG 20615~20635-97 belongs to American system and its compilation principles are as follows:
1. Took ANSI B16.5 and B16.47 as reference standard for the part of pipe flange; the SI system of parameters and dimensions is based on ISO 7005-1 (1992) and ISO 7483 (1991);
2. Adopted the marking pressure class of ISO 7005-1 (1992) (cancelling Class 75 and Class 400) so that the pressure classes of pipe flanges in European system and American system will not be mixed up.
PN(MPa) Class
2.0 150
5.0 300
11.0 600
15.0 900
26.0 1,500
42.0 2,500
3. Restricted the applicable PN-DN range of threaded flange and loose flange:
Threaded flange PN2.0~5.0MPa DN15~150mm
Loose flange PN2.0~11.0MPa DN15~600mm
4. Incorporated welding neck-collar (ANSI B16.9 and MSS SP43) into loose flange standard;
5. Incorporated Series B large-diameter flange of in ANSI B16.47 (API 605), and cancelled Series A large-diameter flange;
6. Increased DN 550mm (PN 2.0~11.0MPa);
7. Two sealing face types, i.e., small male and female face and small tongue and groove face, were not listed;
8. Restricted the flange types applicable to ring-joint face (integral flange, welding neck flange, socket welding flange and flange cover);
9. Compiled the pressure-temperature table according to ISO 7005-1 (1992) and ANSI B16.5 (1988); the applicable pressures of 20# steel and 15CrMo were properly adjusted due to the difference of mechanical property at normal temperatures, and the corresponding material classification of 16Mn is Class 1.3;
10. Compiled gasket standard on the basis of ANSI B16.20 (1993) and B16.21 (1992);
11. Increased the table of bolting length matching various flange joints;
12. Determined standard system and standard constitution of the part of American system by reference to HG 20592~20614-97 (European system).
This standard was proposed and organized for preparation by the Equipment design technology center station of Ministry of Chemical Industry and the chemical process piping design technique center of Ministry of Chemical Industry.
Chief drafters of this standard: Ying Daoyan, Yu Jun and He Anliang.
PROFESSIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
中华人民共和国行业标准
HG 20601-97
Steel Pipe Flanges Cover (European System)
钢制管法兰、垫片、紧固件（欧洲体系）
1 Subject Content and Application Scope
This standard specifies types, dimensions, technical requirements and relevant application requirements of steel pipe flange covers (European system).
This standard is applicable to steel pipe flange covers with nominal pressure PN 0.25 MPa (2.5bar) ~25.0 MPa (250bar).
2 Normative References
HG 20592 Steel Pipe Flanges Types and Parameters (European System)
HG 20603 Specification for Steel Pipe Flanges (European System)
HG 20604 Steel Pipe Flanges Pressure-temperature Class (European System)
HG 20613 Fasteners Used for Steel Pipe Flanges (European System)
HG 20614 Selection of Steel Pipe Flanges, Gaskets and Bolting (European System)
3 Flange Cover Sealing Face Type or/and Application Scope
3.0.1 Flange cover has five sealing face types, i.e., raised face (RF), male and female face (MFM), tongue and groove face (TG), flat face (FF) and ring-joint face (RJ), and its dimension and selection shall be according to those specified in Chapter 6 and Chapter 8 of HG 20592.
The sealing face dimensions f1 and f2 of flange cover with raised face, male and female face as well as tongue and groove face are included in flange thickness C.
The platform height E of flange cover with ring joint face flange is not included in the flange thickness C.
3.0.2 The pressure and diameter range applicable to flange cover with various sealing face types shall be according to those specified in Table 3.0.2.
Table 3.0.2 applicable range (mm)
Sealing face type Nominal pressure PN, MPa (bar)
0.25
(2.5) 0.6
(6) 1.0
(10) 1.6
(16) 2.5
(25) 4.0
(40) 6.3
(63) 10.0
(100) 16.0
(160) 25.0
(250)
Raised face (RF) DNl0~2,000 DN10~1,200 DN10~600 DN10~400 DN10~300
Male and female face (MFM) - DN10~600 DN10~400 DN10~300 -
Tongue and groove face (TG) - DN10~600 DN10~400 DN10~300 -
Flat face (FF) DN10~600 DN10~1200 -
Ring-joint face (RJ) - DN15~400 DN15~300
4 Flange Cover Dimension
The dimension of flange cover shall comply with those specified in Figure 4-1 and Tables 4-1~10.
Table 4-1 PN0.25MPa (2.5bar) Steel Pipe Flange Cover
Table 4-2 PN0.6MPa (6bar) Steel Pipe Flange Cover
Table 4-3 PN1.0MPa (10bar) Steel Pipe Flange Cover
Table 4-4 PN1.6MPa (16bar) Steel Pipe Flange Cover
Table 4-5 PN2.5MPa (25bar) Steel Pipe Flange Cover
Table 4-6 PN4.0MPa (40bar) Steel Pipe Flange Cover
Table 4-7 PN6.3MPa (63bar) Steel Pipe Flange Cover
Table 4-8 PN10.0MPa (100bar) Steel Pipe Flange Cover
Table 4-9 PN16.0MPa (160bar) Steel Pipe Flange Cover
Table 4-10 PN25.0MPa (250bar) Steel Pipe Flange Cover
Figure 4-1 steel pipe flange cover (BL)
Table 4-1 PN0.25MPa (2.5bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
C Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole
L Number of bolt holes
n Thread
Th
10 75 50 11 4 M10 12 0.38
15 80 55 11 4 M10 12 0.44
20 90 65 11 4 M10 14 0.66
25 100 75 11 4 M10 14 0.82
32 120 90 14 4 M12 16 1.34
40 130 100 14 4 M12 16 1.59
50 140 110 14 4 M12 16 1.86
65 160 130 14 4 M12 16 2.45
80 190 150 18 4 M16 18 3.86
100 210 170 18 4 M16 18 4.75
125 240 200 18 8 M16 20 6.78
150 265 225 18 8 M16 20 8.34
200 320 280 18 8 M16 22 13.5
250 375 335 18 12 M16 24 20.2
300 440 395 22 12 M20 24 27.8
350 490 445 22 12 M20 24 34.7
400 540 495 22 16 M20 24 42.0
450 595 550 22 16 M20 24 51.2
500 645 600 22 20 M20 26 65.1
600 755 705 26 20 M24 30 102.9
700 860 810 26 24 M24 36 160.5
800 975 920 30 24 M27 38 217.5
900 1075 1020 30 24 M27 40 279.5
1000 1175 1120 30 28 M27 42 350.8
1200 1375 1320 30 32 M27 44 504.8
1400 1575 1520 30 36 M27 48 724.2
1600 1790 1730 30 40 M27 51 995.7
1800 1990 1930 30 44 M27 54 1304.6
2000 2190 2130 30 48 M27 58 1698.7
Table 4-2 PN0.6MPa (6bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
C Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole Number of bolt holes
n Thread
Th
10 75 50 11 4 M10 12 0.38
15 80 55 11 4 M10 12 0.44
20 90 65 11 4 M10 14 0.66
25 100 75 11 4 M10 14 0.82
32 120 90 14 4 M12 16 1.34
40 130 100 14 4 M12 16 1.59
50 140 110 14 4 M12 16 1.86
65 160 130 14 4 M12 16 2.45
80 190 150 18 4 M16 18 3.86
100 210 170 18 4 M16 18 4.75
125 240 200 18 8 M16 18 6.10
150 265 225 18 8 M16 20 8.34
200 320 280 18 8 M16 22 13.5
250 375 335 18 12 M16 24 20.2
300 440 395 22 12 M20 24 27.8
350 490 445 22 12 M20 24 34.7
400 540 495 22 16 M20 24 42.0
450 595 550 22 16 M20 24 51.2
500 645 600 22 20 M20 26 65.1
600 755 705 26 20 M24 30 102.9
700 860 810 26 24 M24 40 178.3
800 975 920 30 24 M27 44 251.9
900 1075 1020 30 24 M27 48 335.4
1000 1175 1120 30 28 M27 52 434.3
1200 1405 1340 33 32 M30×2 60 717.0
1400 1630 1560 36 36 M33×2 68 1093.8
1600 1830 1760 36 46 M33×2 76 1544.1
1800 2045 1970 39 44 M36×3 84 2130.1
2000 2265 2180 42 48 M39×3 92 2860.5
Table 4-3 FN1.0MPa (10bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
L Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole
L Number of bolt holes
n Thread
Th
10 90 60 14 4 M12 14 0.63
15 95 65 14 4 M12 14 0.71
20 105 75 14 4 M12 16 1.01
25 115 85 14 4 M12 16 1.23
32 140 100 18 4 M16 18 2.03
40 150 110 18 4 M16 18 2.35
50 165 125 18 4 M16 20 3.20
65 185 145 18 4 M16 20 4.06
80 200 160 18 8 M16 20 4.61
100 220 180 18 8 M16 22 6.21
125 250 210 18 8 M16 22 8.12
150 285 240 22 8 M20 24 11.4
200 340 295 22 8 M20 24 16.5
250 395 350 22 12 M20 26 24.1
300 445 400 22 12 M20 26 30.8
350 505 460 22 16 M20 26 39.6
400 565 515 26 16 M24 26 49.4
450 615 565 26 20 M24 28 62.9
500 670 620 26 20 M24 28 75.1
600 780 725 30 20 M27 34 123.7
700 895 840 30 24 M27 38 182.5
800 1015 950 33 24 M30×2 42 259.9
900 1115 1050 33 28 M30×2 46 343.8
1000 1230 1160 36 28 M33×2 52 473.2
1200 1455 1380 39 32 M36×3 60 764.7
Table 4-4 PN1.6MPa (16bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
C Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole
L Number of bolt holes
n Thread
Th
10 90 60 14 4 M12 14 0.63
15 95 65 14 4 M12 14 0.71
20 105 75 14 4 M12 16 1.01
25 115 85 14 4 M12 16 1.23
32 140 100 18 4 M16 18 2.03
40 150 110 18 4 M16 18 2.35
50 165 125 18 4 M16 20 3.20
65 185 145 18 4 M16 20 4.06
80 200 160 18 8 M16 20 4.61
100 220 180 18 8 M16 22 6.21
125 250 210 18 8 M16 22 8.12
150 285 240 22 8 M20 24 11.4
200 340 295 22 12 M20 24 16.2
250 405 355 26 12 M24 26 25.0
300 460 410 26 12 M24 28 35.1
350 520 470 26 16 M24 30 48.0
400 580 525 30 16 M27 32 63.5
450 640 585 30 20 M27 36 86.9
500 715 650 33 20 M30×2 36 108.6
600 840 770 36 20 M33×2 44 184.3
700 910 840 36 24 M33×2 48 235.7
800 1025 950 39 24 M36×3 52 325.0
900 1125 1050 39 28 M36×3 58 437.1
1000 1255 1170 42 28 M39×3 64 601.7
1200 1485 1390 48 32 M45×3 78 998.2
Table 4-5 PN2.5MPa (25bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
C Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole
L Number of bolt holes
n Thread
Th
10 90 60 14 4 M12 14 0.60
15 95 65 14 4 M12 14 0.71
20 105 75 14 4 M12 16 1.01
25 115 85 14 4 M12 16 1.23
32 140 100 18 4 M16 18 2.03
40 150 110 18 4 M16 18 2.35
50 165 125 18 4 M16 20 3.20
65 185 145 18 8 M16 22 4.29
80 200 160 18 8 M16 24 5.53
100 235 190 22 8 M20 24 7.59
125 270 220 26 8 M24 26 10.8
150 300 250 26 8 M24 28 14.6
200 360 310 26 12 M24 30 22.5
250 425 370 30 12 M27 32 33.5
300 485 430 30 16 M27 34 46.3
350 555 490 33 16 M30×2 38 68.0
400 620 550 36 16 M33×2 40 89.6
450 670 600 36 20 M33×2 46 119.9
500 730 660 36 20 M33×2 48 150.0
600 845 770 39 20 M36×3 58 244.3
Referred in HG 20601-1997: |
HG 20601-1997 is referred in:
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Introduction of HG 20601-1997
This standard (HG 20592~20635-97) is formulated by revising the primary standard HGJ 44~76-91 as well as HG 20527-92 and HG 20529-92 by reference to ISO 7005-1 (1992), ANSI B16.5 and DIN standards. The new standard after revision includes the international current European and American systems and forms a set of standard in allusion to pipe flange, gasket and bolting which has intact contents and clear system and is suited for Chinese conditions and gears to the international conventions. The new standard will improve the current situations of standards in this field such as disordered system, poor matchability and obsolete contents.
Thereinto, HG 20592~20614-97 belongs to European system and is formulated by revising and combining HGJ 44~76-91, HG 20527-92, HG 20529-92 and HG 5001~5028-58. Compared with the former standard, the newly revised standard has the following changes:
1. Applicable to outside diameter of steel tube, extending to international current series (A) and domestic following series (B) from domestic following series;
2. Supplemented threaded flange and integral flange and cancelled flanging ring loose flange;
3. Adjusted the pressure class range of slip-on hubbed flange and slip-on-welding flange
Slip-on hubbed flange PN0.6~4.0MPa DN≤600mm
Slip-on-welding flange PN0.25~0.6MPa DN≤2000mm
PN1.0~2.5MPa DN≤600mm
4. Revised sealing face dimensions and flange technical conditions;
5. Increased material varieties such as cast steel material and low temperature steel forging;
6. The pressure-temperature table of stainless steel was revised on the basis of 1% yield strength;
7. Adapting to two sets of steel tube outside diameter series, and adjusted and supplemented the gasket dimension;
8. Supplemented rubber, synthetic rubber and non-asbestos rubber pressboards as well as modified (filled) polytetrafluoroethylene flat washer material; revised the asbestos rubber gasket standard as standard for flat washer made of various nonmetallic materials;
9. Increased bolting length matching for various flange joints;
10. Marked the pipe flanges with the standard No. in HG 20592.
HG 20615~20635-97 belongs to American system and its compilation principles are as follows:
1. Took ANSI B16.5 and B16.47 as reference standard for the part of pipe flange; the SI system of parameters and dimensions is based on ISO 7005-1 (1992) and ISO 7483 (1991);
2. Adopted the marking pressure class of ISO 7005-1 (1992) (cancelling Class 75 and Class 400) so that the pressure classes of pipe flanges in European system and American system will not be mixed up.
PN(MPa) Class
2.0 150
5.0 300
11.0 600
15.0 900
26.0 1,500
42.0 2,500
3. Restricted the applicable PN-DN range of threaded flange and loose flange:
Threaded flange PN2.0~5.0MPa DN15~150mm
Loose flange PN2.0~11.0MPa DN15~600mm
4. Incorporated welding neck-collar (ANSI B16.9 and MSS SP43) into loose flange standard;
5. Incorporated Series B large-diameter flange of in ANSI B16.47 (API 605), and cancelled Series A large-diameter flange;
6. Increased DN 550mm (PN 2.0~11.0MPa);
7. Two sealing face types, i.e., small male and female face and small tongue and groove face, were not listed;
8. Restricted the flange types applicable to ring-joint face (integral flange, welding neck flange, socket welding flange and flange cover);
9. Compiled the pressure-temperature table according to ISO 7005-1 (1992) and ANSI B16.5 (1988); the applicable pressures of 20# steel and 15CrMo were properly adjusted due to the difference of mechanical property at normal temperatures, and the corresponding material classification of 16Mn is Class 1.3;
10. Compiled gasket standard on the basis of ANSI B16.20 (1993) and B16.21 (1992);
11. Increased the table of bolting length matching various flange joints;
12. Determined standard system and standard constitution of the part of American system by reference to HG 20592~20614-97 (European system).
This standard was proposed and organized for preparation by the Equipment design technology center station of Ministry of Chemical Industry and the chemical process piping design technique center of Ministry of Chemical Industry.
Chief drafters of this standard: Ying Daoyan, Yu Jun and He Anliang.
PROFESSIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
中华人民共和国行业标准
HG 20601-97
Steel Pipe Flanges Cover (European System)
钢制管法兰、垫片、紧固件（欧洲体系）
1 Subject Content and Application Scope
This standard specifies types, dimensions, technical requirements and relevant application requirements of steel pipe flange covers (European system).
This standard is applicable to steel pipe flange covers with nominal pressure PN 0.25 MPa (2.5bar) ~25.0 MPa (250bar).
2 Normative References
HG 20592 Steel Pipe Flanges Types and Parameters (European System)
HG 20603 Specification for Steel Pipe Flanges (European System)
HG 20604 Steel Pipe Flanges Pressure-temperature Class (European System)
HG 20613 Fasteners Used for Steel Pipe Flanges (European System)
HG 20614 Selection of Steel Pipe Flanges, Gaskets and Bolting (European System)
3 Flange Cover Sealing Face Type or/and Application Scope
3.0.1 Flange cover has five sealing face types, i.e., raised face (RF), male and female face (MFM), tongue and groove face (TG), flat face (FF) and ring-joint face (RJ), and its dimension and selection shall be according to those specified in Chapter 6 and Chapter 8 of HG 20592.
The sealing face dimensions f1 and f2 of flange cover with raised face, male and female face as well as tongue and groove face are included in flange thickness C.
The platform height E of flange cover with ring joint face flange is not included in the flange thickness C.
3.0.2 The pressure and diameter range applicable to flange cover with various sealing face types shall be according to those specified in Table 3.0.2.
Table 3.0.2 applicable range (mm)
Sealing face type Nominal pressure PN, MPa (bar)
0.25
(2.5) 0.6
(6) 1.0
(10) 1.6
(16) 2.5
(25) 4.0
(40) 6.3
(63) 10.0
(100) 16.0
(160) 25.0
(250)
Raised face (RF) DNl0~2,000 DN10~1,200 DN10~600 DN10~400 DN10~300
Male and female face (MFM) - DN10~600 DN10~400 DN10~300 -
Tongue and groove face (TG) - DN10~600 DN10~400 DN10~300 -
Flat face (FF) DN10~600 DN10~1200 -
Ring-joint face (RJ) - DN15~400 DN15~300
4 Flange Cover Dimension
The dimension of flange cover shall comply with those specified in Figure 4-1 and Tables 4-1~10.
Table 4-1 PN0.25MPa (2.5bar) Steel Pipe Flange Cover
Table 4-2 PN0.6MPa (6bar) Steel Pipe Flange Cover
Table 4-3 PN1.0MPa (10bar) Steel Pipe Flange Cover
Table 4-4 PN1.6MPa (16bar) Steel Pipe Flange Cover
Table 4-5 PN2.5MPa (25bar) Steel Pipe Flange Cover
Table 4-6 PN4.0MPa (40bar) Steel Pipe Flange Cover
Table 4-7 PN6.3MPa (63bar) Steel Pipe Flange Cover
Table 4-8 PN10.0MPa (100bar) Steel Pipe Flange Cover
Table 4-9 PN16.0MPa (160bar) Steel Pipe Flange Cover
Table 4-10 PN25.0MPa (250bar) Steel Pipe Flange Cover
Figure 4-1 steel pipe flange cover (BL)
Table 4-1 PN0.25MPa (2.5bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
C Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole
L Number of bolt holes
n Thread
Th
10 75 50 11 4 M10 12 0.38
15 80 55 11 4 M10 12 0.44
20 90 65 11 4 M10 14 0.66
25 100 75 11 4 M10 14 0.82
32 120 90 14 4 M12 16 1.34
40 130 100 14 4 M12 16 1.59
50 140 110 14 4 M12 16 1.86
65 160 130 14 4 M12 16 2.45
80 190 150 18 4 M16 18 3.86
100 210 170 18 4 M16 18 4.75
125 240 200 18 8 M16 20 6.78
150 265 225 18 8 M16 20 8.34
200 320 280 18 8 M16 22 13.5
250 375 335 18 12 M16 24 20.2
300 440 395 22 12 M20 24 27.8
350 490 445 22 12 M20 24 34.7
400 540 495 22 16 M20 24 42.0
450 595 550 22 16 M20 24 51.2
500 645 600 22 20 M20 26 65.1
600 755 705 26 20 M24 30 102.9
700 860 810 26 24 M24 36 160.5
800 975 920 30 24 M27 38 217.5
900 1075 1020 30 24 M27 40 279.5
1000 1175 1120 30 28 M27 42 350.8
1200 1375 1320 30 32 M27 44 504.8
1400 1575 1520 30 36 M27 48 724.2
1600 1790 1730 30 40 M27 51 995.7
1800 1990 1930 30 44 M27 54 1304.6
2000 2190 2130 30 48 M27 58 1698.7
Table 4-2 PN0.6MPa (6bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
C Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole Number of bolt holes
n Thread
Th
10 75 50 11 4 M10 12 0.38
15 80 55 11 4 M10 12 0.44
20 90 65 11 4 M10 14 0.66
25 100 75 11 4 M10 14 0.82
32 120 90 14 4 M12 16 1.34
40 130 100 14 4 M12 16 1.59
50 140 110 14 4 M12 16 1.86
65 160 130 14 4 M12 16 2.45
80 190 150 18 4 M16 18 3.86
100 210 170 18 4 M16 18 4.75
125 240 200 18 8 M16 18 6.10
150 265 225 18 8 M16 20 8.34
200 320 280 18 8 M16 22 13.5
250 375 335 18 12 M16 24 20.2
300 440 395 22 12 M20 24 27.8
350 490 445 22 12 M20 24 34.7
400 540 495 22 16 M20 24 42.0
450 595 550 22 16 M20 24 51.2
500 645 600 22 20 M20 26 65.1
600 755 705 26 20 M24 30 102.9
700 860 810 26 24 M24 40 178.3
800 975 920 30 24 M27 44 251.9
900 1075 1020 30 24 M27 48 335.4
1000 1175 1120 30 28 M27 52 434.3
1200 1405 1340 33 32 M30×2 60 717.0
1400 1630 1560 36 36 M33×2 68 1093.8
1600 1830 1760 36 46 M33×2 76 1544.1
1800 2045 1970 39 44 M36×3 84 2130.1
2000 2265 2180 42 48 M39×3 92 2860.5
Table 4-3 FN1.0MPa (10bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
L Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole
L Number of bolt holes
n Thread
Th
10 90 60 14 4 M12 14 0.63
15 95 65 14 4 M12 14 0.71
20 105 75 14 4 M12 16 1.01
25 115 85 14 4 M12 16 1.23
32 140 100 18 4 M16 18 2.03
40 150 110 18 4 M16 18 2.35
50 165 125 18 4 M16 20 3.20
65 185 145 18 4 M16 20 4.06
80 200 160 18 8 M16 20 4.61
100 220 180 18 8 M16 22 6.21
125 250 210 18 8 M16 22 8.12
150 285 240 22 8 M20 24 11.4
200 340 295 22 8 M20 24 16.5
250 395 350 22 12 M20 26 24.1
300 445 400 22 12 M20 26 30.8
350 505 460 22 16 M20 26 39.6
400 565 515 26 16 M24 26 49.4
450 615 565 26 20 M24 28 62.9
500 670 620 26 20 M24 28 75.1
600 780 725 30 20 M27 34 123.7
700 895 840 30 24 M27 38 182.5
800 1015 950 33 24 M30×2 42 259.9
900 1115 1050 33 28 M30×2 46 343.8
1000 1230 1160 36 28 M33×2 52 473.2
1200 1455 1380 39 32 M36×3 60 764.7
Table 4-4 PN1.6MPa (16bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
C Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole
L Number of bolt holes
n Thread
Th
10 90 60 14 4 M12 14 0.63
15 95 65 14 4 M12 14 0.71
20 105 75 14 4 M12 16 1.01
25 115 85 14 4 M12 16 1.23
32 140 100 18 4 M16 18 2.03
40 150 110 18 4 M16 18 2.35
50 165 125 18 4 M16 20 3.20
65 185 145 18 4 M16 20 4.06
80 200 160 18 8 M16 20 4.61
100 220 180 18 8 M16 22 6.21
125 250 210 18 8 M16 22 8.12
150 285 240 22 8 M20 24 11.4
200 340 295 22 12 M20 24 16.2
250 405 355 26 12 M24 26 25.0
300 460 410 26 12 M24 28 35.1
350 520 470 26 16 M24 30 48.0
400 580 525 30 16 M27 32 63.5
450 640 585 30 20 M27 36 86.9
500 715 650 33 20 M30×2 36 108.6
600 840 770 36 20 M33×2 44 184.3
700 910 840 36 24 M33×2 48 235.7
800 1025 950 39 24 M36×3 52 325.0
900 1125 1050 39 28 M36×3 58 437.1
1000 1255 1170 42 28 M39×3 64 601.7
1200 1485 1390 48 32 M45×3 78 998.2
Table 4-5 PN2.5MPa (25bar) Steel Pipe Flange Cover (mm)
Nominal diameter
DN Connection dimension Flange cover thickness
C Theoretical weight of flange cover
(kg)
Outer diameter of flange cover
D Diameter of bolt hole center circle
K Diameter of bolt hole
L Number of bolt holes
n Thread
Th
10 90 60 14 4 M12 14 0.60
15 95 65 14 4 M12 14 0.71
20 105 75 14 4 M12 16 1.01
25 115 85 14 4 M12 16 1.23
32 140 100 18 4 M16 18 2.03
40 150 110 18 4 M16 18 2.35
50 165 125 18 4 M16 20 3.20
65 185 145 18 8 M16 22 4.29
80 200 160 18 8 M16 24 5.53
100 235 190 22 8 M20 24 7.59
125 270 220 26 8 M24 26 10.8
150 300 250 26 8 M24 28 14.6
200 360 310 26 12 M24 30 22.5
250 425 370 30 12 M27 32 33.5
300 485 430 30 16 M27 34 46.3
350 555 490 33 16 M30×2 38 68.0
400 620 550 36 16 M33×2 40 89.6
450 670 600 36 20 M33×2 46 119.9
500 730 660 36 20 M33×2 48 150.0
600 845 770 39 20 M36×3 58 244.3
Contents of HG 20601-1997