This standard specifies the types and dimensions of steel pipe flanges for convex panel flat lamps with nominal pressures PN of 0.25, 0.6, 1.0, 1.6, and 2.5MPa. This standard is applicable to convex plate flat welded steel pipe flanges with nominal pressure PNO.25~2.5MPa. JB/T 81-1994 Convex panel flat welded steel pipe flange JB/T81-1994 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Convex panel flat welded steel pipe flange
Theme content and scope of application
JB/T81...94
Generation 8i
This standard specifies the type and dimensions of convex plate flat welded steel pipe flanges with a nominal medical strength PN of 0.25.0.6.1.0.1.6.2.5MPa.
This standard applies to convex plate flat welded steel pipe flanges with nominal pressure PN0.25~2.5MPa. 2
Quoted standards
JB/T74 pipeline flange technical conditions
3 The type and size of the flange should comply with the regulations in Figure 1 and Tables 1 to 5. The technical requirements of the small
K
Figure 1
method are in accordance with the provisions of JB/T74. 4
The nominal pressure of the flange and the maximum allowable working pressure at different temperatures are in accordance with the provisions of Appendix B of JB/T74. 5
6 Marking Example
Convex sheet-type flat-welded steel pipe manufacturing method with nominal diameter 100mm, nominal pressure 2.5MPa, size series 2: Method 100-25JB/T 81---94
Convex plate flat welded steel pipe with nominal diameter 100mm, nominal pressure 2.5MPa, size series 1. Legal benefit: flange 100-25 (series 1) JB/T81-94 Ministry of Machinery Industry of the People's Republic of China Approved on 1994-12-09 354
Implemented on 1995.10-01
Pipe
Nominal
Diameter
DN
-.|| tt||1
15
20
25
32
40
30
6.3||tt| |80
100)
125
Outer diameter
A
-
..
14||tt ||1.8
25
32
38
15
57
78
89
108
133
[59
150
(175) 194
1219
200
(225)| |tt||245
250
340
350
100
150
500
600||tt ||70
800
SOG
1000
1200
1400
273
325
377
126
480
530
630
720
8
920
1020| |tt||1220
1120
[h
1620
Flange outer diameter
JB/T 81 .- 94
Table 1PNo.25MPa convex panel type flat welded steel pipe flange traces ||80
90
100
1209
130
140
160
190/185||tt ||210/205
240/235
265/260
290
320/315
340
375/370| |tt||440/435
490/485
540/535
595/590
645/6-10
755||tt ||860
975
1075
1175
1375
1575
1 790/1 785
diameter| |tt||K
50
55
63
75
90
100
110||tt ||130
150
170
200
L
225
255
280
305
335
395
44.5
495
550
600
705
810| |tt||920
1020
1120
1320
1520
1730
continue
end||tt ||Screw hole diameter
L
Series 1/Series 2
12
12
12
12||tt| |14
14
14
14
18
18
18
18
18
18
18
18
23
23
23
23
23|| tt||26/25
26/25
30
30
30
30
30
30
Bolts, studs
Quantity
4
4
4
4
4
4
4
8
8
8
8
8
12
12| |tt||12
16
16
16
20
24
24
24||tt ||28
32
36
10
Thread Th.
Series 1/Series 2
M10
MJO
M10
MIo
M12
M12
M12
M12
M16
M16| |tt||M16
M16
MI
M16
M16
M16
M20
M20||tt ||M20
M20
M20
M24/M22
M24/M22
M27
M27
M? ?
N127
M27
M27
Dense surface size
d
32
4||tt| |50
63
7)
80
9
110)
125
145||tt| |175
200
230
255
280
310
362
412
462
518
568
670
775
880
980
1080
1280|| tt||1480
1690
2Www.bzxZ.net
2
3
3
3
3||tt| |3
3
3
:
4
3
5
L
法盖法》
小是
肉很||tt| |F
1
1
12
12
12
12
13
1
14
14
1.1
G
16
1s
20
22|| tt||H
19
26
33
39
16
59
75||tt| |T1
135
161
196
222
248
275
，
22
：328
38
22
1.3
22
2-1
2
2
26
26
28
30
30
32
32
184| |tt||634
31
724
21
984
1021
1224
112||tt ||1G24
法上
论论
道发
(1. 25
0.25
0.45
(0.81 :
0.95
1.4
1.13
1.
2. 26.
2.78
3.49||tt ||3.86
i.s8
5.933
7.52
9.-10
20.
11.7
Ti.!
rn.2
21.3
29. 1
36.7
.2
32 7
6.
78.
:.. 3
3.319
公称
通很
N
10| |tt||15
20
25
32
40
50
65
80||tt ||100
125
150
(175)
200
(225)
250
300| |tt||350
100
450
500
600
700
800
900||tt ||1000
356
管子
外很
A
14
18
25||tt| |32
38
45
57
73
89
108
133
159
194
219
245
273
325
377
426
480|| d| |tt||JB/T 81-94
表2PNO.60MPa凸表式式平没钢制管谢机制作连
螺梓孔
中心圆
系系1/系系2
75
80
90
100
120
130
140||tt ||160
190/185
210/205
240/235
265/260
290
320/315| |tt||340
375/370
440/435
490/485
540/535
595/590
645/640
755
860
975
1075
1175
diameter
K
50
55
65
75
90
100
110
130
150| |tt||170
200
225
255
280
305
335
395||tt ||445
495
550
600
705
810
920
1020
1120. |tt||12
12
14
14
14
14
18
18||tt ||18
18
18
18
18
18
23
23
23
23
23
26/25
26/25
30
30
30||tt ||寸
quantity
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8| |tt||12
12
12
16
16
16
20
24||tt ||24
24
28
螺梓、螺柱
螺纹Th.
系系1/系系2
M10
Mi0
M10
M10
M12
M12||tt| |M12
M12
M1f
M16
M16
M16
M16
M16
M16
M16
M20
M20
M20
M20
M20
M24/M22
M24 /M22
M27
M27
M27
工业面包装
d
32
40||tt| |50
60
70
80
90
110
125
145
175
200
230
255
280
310
362
412
462|| tt||518
568
670
775
880
980
1080
2||tt| |3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
5
5|| t | tt||12
12
14
14
16
16
16
16||tt| |18
18
20
20
22
22
22
24
24
26
28
28
30
30
32
32
34|| tt||36
15
19
26
33
39
46
59||tt| |75
91
110
135
161
196
222
248
276
328
380
430
484
534
634
724
824|| tt||924
1024
mm
艺院
论论
道发
kg
0.31||tt ||0.34
0.54
0.64
1.10
1.22
1.35
1.67
2.48
2.89
3.94
4. 47||h||5.54||h||6.07||h||6.60||h||8.03||h||10.30||h||12.59||h||15.20||h||17.59| |tt||20.67
26.37
37.10
46.20
55.10
64.36
公称
通很|| tt||DN
10
15
20
25
32
40
50||tt| |65
80
100
125
150
(175)
200
(225)|| tt||250
300
350
400
450
500
600
管子||tt| |外很
A
14
18
25
32
38
45
57
73
89
108
133
159
194
219
245| |tt||273
325
377
426
480
530
630
蛋外很
D
JB/T81-94
3PN1.0MPa凸光式平没钢制管蛋线包装表3
连
螺梓孔
中心圆
系系1/系系2
90
95
105
115
140/135| |tt||150/145
165/160
185/180
200/195
220/215
250/245||tt ||285/280
310
340/335
365
395/390
445/440
505/500| |tt||565
615
670
780
diameter
K
60
65||tt ||75
85
100
110
125
145
160
180
210
240
270
295
325
350
400
460
515| |tt||565
620
725
E
尺
接
螺栓孔化合
1| |tt||寸
quantity
系列1/系列2
14
14
14
14
18
18
18
18
18
18
18
23
23| |tt||23
23
23
23
23
26/25
26/25
26/25
30
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8| |tt||12
12
16
螺梓、螺柱
螺纹Th.
系系1/系系2
M12
M12
M12
M12
M16
M16||tt| |M16
M16
M16
M16
M16
M20
M20
M20
M20
M20
M20
M20
16
20
20
20
M24/M22
M24/M22
M24/M22
M27
工业面包装
d
40
45|| tt||55
65
78
85
100
120
135
153||tt| |185
210
210
265
295
320
368
428
482
532
585
685
2
2
2
2
2|| tt||3
3
3
3
3
3
3
3||tt| |3
3
3
4
4
4
4
4
5
艺艺艺
小明
内很
B
12
14
14
16
18
18
20
20
22
24
24
24| |tt||15
19
26
33
39
46
59
75||tt ||91
110
135
161
196
222
24
24
26
28
28
30
30
32
36
248
276| |tt||mm
艺院
论论
道作
kg
0.46
(0. 51
0.75
0.89
1.40
1.71
2.09
2.84
3.24
4.01| |tt||5.40
6.67
7. 44
8.24
9.30
10.70
112.90
328
380
16.90
43021.80| |tt||484
534
634
24.40
27.70
39.40
357
公称||tt ||通很
DN
10
15
24
25
32
40||tt| |50
65
St
1Ca
25
150
(175)
200||tt| |(225)
25
300
350
100
450
50m
600||tt| |子
外很
14
18
25
32
38
45
57
73
89
108
133
159
19.4
219
245| |tt||1273
$23
377
426
480
530
630
358||tt ||色外很
JB/T 81-94
表4PN1.6MPa凸光式平没钢制管色制制连
軺孔
中心圆
系系1/系系2：
90
5.5
105
115
140/135
150/145
1657160
185/180
200/195
220/215
250/245
285/280| |tt||310
3407335
365
405
460
520
580
640||tt ||715/705
840
diameter
K
60
65
85
100||tt ||110
125
145
160
180
210
2.10
270
295
325
355
110
170
525
585
650
770| |tt||接
軺没孔化合
1.
寸
水度
系列1/系列2
14| |tt||11
14
14
18
18
18
18
18||tt ||18
18
23
23
23
25
26/25
26/25| |tt||26/25
30
30
34
36/41
4
8
8
8
8
8
1.2
12
12
12
16| |tt||16
20
20
軺梓、螺柱
軺纹T
系系1/系系2
M12| |tt||M12
M12
M12
M16
MlG
M16
MI
M16||tt ||M16
ME
M20
M20
M20
M20
M24/M22
M24/M22| M24/M22 ||法“法》
小明「内很
0
45
ta
78
8:5
100
120
135
155
185
210
240
265| |tt||295
320
375
-135
185
343
fo8
718|| tt||3
3
3
3
3
3
4
4||tt| |11
1
2
2-1
26
28
28
30||tt| |1
G
i
lt
：
133
161
1196
19
mr
法
设计
道作
kH
,
9.71
0.87|| tt||1.18
J.
2. ()
2.61
3.

G、1
.92
8.
10.10
248
11.74)
30||tt ||32 276
328
3.4
.70
13. 1:
30 33. 30
88
136
31.43
10.2
1
56||tt ||531
53. 7.
.
公称
通很
TN
10
15
20
25
32
-40
50
65
80
100
125
150
(175)
200
(225)
2503
300
330
100||tt| |450
300
臂子
外很
A
14
18
25||tt| |32
38
45
57
73
89
108
133
159
19-1
219
243
273
325
377
426
180
530
艺外外很
表5
JB/T81--.94
PV2.5MPa凸光式式乎没钢制管法盖化学连
螺梓孔
中心國
diameter
系系1/系系2
90
95||tt| |105
115
140/135
150/145
165/160
185/180
200/195|| tt||235/230
270
300
330
360
395
425
485|| tt||5557550
620/610
6707660
730
K
60
65
75|| tt||85
100
110
125
145
160
190
220||tt| |250
280
310
340
370
430
490
550
600
660
接
尺
螺梓孔化合
1
系列1/系列2
14|| tt||14
1.1
18
18
18
18
8
23||tt| |26/25
26/25
26/25
26/25
30
30
30||tt| |34
36/34
36/34
36/41
軺梓、螺柱
quantity
4||tt ||4
4
4
8
8
8
8
8
12
12
12
12
16
16
16
20
20| |tt||軺纹Th
系系1/系系2
M12
M12
M12
M12
ME||tt| |M16
M16
M16
Mi6
M20
M24/M22
M24/M22
M24/M22
M24/M22
M27
M27
M27
M3
M33/M30
M33/M30|| tt||M33 / M36
8.5
100
120
135
160
188
218
248|| tt||278
302
332
390
148
505
555
610||tt| |2
2
2
2
3
3
3
3
3
3
3
3
3
3
1
法法益
原内任
-
16
18
18
20
22
24
21| |tt||26
28
30
30
32
32
3·1
31| |tt||36
42
48
！
1
26
33
39||tt ||59
o
135
161
：
196
222
法
耐论
质蟹
ky
()..
,3.
0.0
1.13
1.
2.7
3.2
1.1
G.
8.21
1(0.20)
4.50||tt| |248
17.
27618.90
328 26-60
380
13
181
534
52
34.3.||tt ||.(
Hit.y
67.31:
Note: The flange connection dimensions of Series 1 in Tables 1 to 3 are different from the national and German flange standard dimensions: Series 2 Dimensions of the original machine standard method: New household product design should give priority to the series! (The theoretical quality of the flange listed in Table 2~Table 5 refers to the series 2 method. Additional instructions:
This standard was proposed and managed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry. The main drafters of this standard were Li Junying, Wu Zhenjia, and Zhang Fenglin359
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