This standard replaces JB 79-59. JB/T 79.4-1994 Ring connection surface integral cast steel pipe flange JB/T79.4-1994 standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Ring connection surface integral cast steel pipe flange
Subject content and scope of application
JB/T 79. 4
Replaces JB7959|| tt | ~20.0MPa ring connection surface integral cast steel pipe flange. 2 Reference standard
JB/T74 pipeline flange technical conditions
3 The type and size of the flange should comply with the regulations in Figure 1 and Table 1~Table 4. X
Figure 1
Note: 1) The height of the protruding part is equal to the depth E of the trapezoidal groove, but is not limited by the tolerance of dimension F. The technical requirements for the fully flat 4-flange with the outline shown in the dotted line are allowed to be in accordance with JB/T74. 5 The nominal pressure of the flange and the maximum allowable operating pressure at different temperatures are in accordance with the regulations in Appendix B of JB/T74. The Ministry of Machinery Industry of the People's Republic of China approved the implementation of 7995-10-01 on 1994-12-09
349
nominal
tongzong
DN
15| |tt||20
25
32
4
50
G5
80
1.030||tt ||125
i50
(175)
200
(225)
250
300
339| |tt||400
500
Flange outer diameter
D
Series 1/Series 2
105
130/125
1403/135
155/150
170/165
180/175
205/200
215/210|| tt||250
295
3457340
3757370
415/405
440/430
470
530 )
5007595
670)
800
350
connect
Table 1
continue
Bolt hole
Center circle
Diameter
K
75
90
100
110||tt| |125
135
160
170
200
240
280
310
345
370
400
460
525
585
705
JB/T 79.4--94|| tt||PN6.3MPa ring connection surface integral cast steel pipe flange size ruler
Bolt hole diameter
t
Series】/Series 2
14||tt ||18
18
23
23
23
23
23
26/25||tt ||30
34
34
36/34
36/34
36/41
36/41||tt ||41
42/48
48/54
Quantity
8
12
12
12| |tt||12
Double-ended stud
Thread Th,
Series 1/Series 2
MI2
M16
M16
M20
M20
M20
M20
M20
M24/M22
M27
M30
M30
M33/M30
M33/M30
M33/M36
16
16
16|| tt||20
M33/M36
M36
M39/M42
M45/M48
Sealing surface ruler
F|| tt||15535
6845
9
7850
182
65
9575
E||tt| |6.50.8
6.50.8
6.3
method
thickness
18
2
0. 8
16.5,0.8
9
22
2-
16.50.824
1051 851 12
1301102| |tt||140115:12
1681115112
202175
12
2-1020512
27023512
30126512
32528012
352320
12
41237512
14751420
525
480
12
8| |tt||8
8
8
X
.
().8
0.8
26
28
30:
332
0.8
0.8
36
0.8
.8
0.8
38
法
33
61
68
80
11|| tt||1
nm
amount
1
18
18
2
20||tt| |2
128
162
181
210
421239
44 268
10.||tt| |46
0.#18
3. 8
10.8160
12
80.8
64059011
10| |tt||heart
66
301
326
8.1
4.42
500
70510||tt ||!
21
26
32
31
0
3
38
38|| tt||2
46
30
55
11
1
18
公称||tt| |通很
DN
15
20
25
32
40
50
65
80
100
125
150
(175)
200
(225)||tt ||250
300
350
400
艺外外很
D
系系1/系系2||tt| |105
130/125
140/135
155/150
170/165
195
220||tt| |230
265
315/310
355/350
380
430
470
505/500
585
655
715
连
JB/T79.4--94
表2PN10.0MPa环电视面推行滨钢管艺机分报
螺梓孔
中心圆
直袍
K
75
90||tt| |100
110
125
145
170
180
210
250
290
320
360
400
430
500
560
620
尺守| |tt||軺梓孔化合
1
系到1/系列2
14
18
18
23|| tt||23
26/25
26/25
26/25
30
34
3.1||tt| |34
36/41
41
41
42/48
48/54
48/54||tt| | quantity
4
4
8
8
8
8
12
12
12
12
12
双头軺柱
軺纹Th.
系系1/系系2
M12
M16
M16
M20
M20
M24/M22
M24/M22
M24/M22| |tt||M27
M30
M30
M30
M33/M36
M36
M36
16| |tt||16
16
M39/M42
M45/M48
M45/M48
d
55||tt ||68
78
工业而化学
E
35
45
50
18265||tt ||95175
112
85
9
9
12
138111012
14811512
172145
112
210|17512
250205
280|235
312|265
352280
382320| |tt||12
12
12
12
12
144237512
498420
558480||tt ||17
17
6.5
6.5
6.5
6.5
6.5
心
8
广x
艺
小明
0.8120
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
22
.
26
28| |tt||32
34
mm
兰骑
法
R
45
61|| tt||68
9()
94
115
132
38
160
03. 8
0.8
03. 8
810.8
0.8
0.8
0.8
11
11
0.8
0. 8
421189
461
222
481251
541284
56
313
60346| |tt||70
76
80
408
466
520
15
17||tt ||18
20
4
4
4
22
4
2
26
30
32
36
38
42
44
18
54| |tt||58
5
6
8
8
11
12
Gt||tt ||112
351
公称
通很
DN
15
20
25||tt| |32
1
50)
65
80
10
123
150
（175）
200
(225)
250
300
352
蛋外很
系系2
110
[30
140
165
175
215
245
260
300
335
390
460
480
545
580
665|| tt||连
JB/T79.4··94
表3PN16.0MPa
100
115
125
165
190
205
240
285|| tt||318
380
400
450
485
570
尺
螺栓孔化合|| tt||系列之
18
23
23
25
27
25
30||tt ||30
34
41
41
48
48
54
54
54
子
quantity
4
4
18
8
8
8| |tt||12
12
12
12
12
16
双头螺柱
螺纹Th.
系列2
M16
M20
M20
M22
M24
M22
M27
M27
M30
M36
M36
M42
M42
M48
M48| |tt||M48
工业面包装
E
5235916.5
6245
72
50
8565| |tt||9275
T:
法
原度
mm
领
法
.| |tt||N
2
49
0.826
9
16.5°
9
1329512|| tt||15211012
168:13012
200|160|12
238190
12
6.5
6.5||tt| |6.5
8
8
8
8
114
270205
10
325255
3451275
17
17
39030517
11
1
4253301711
510138023|| tt||14
0.828
0.8130
0.8
0.8
32
s
6||tt| |76
88
36
102
(3. 81 44
0.846
0.8
0.8
.8
.8
0.8
48||tt| |60
66
74
131
148
172
213
246
287
7813161
0.882
188
0. 8
100
345
578
452
R
17
20
22| |tt||24
28 5
33
34
36
14
4.8
56|| tt||8
110
110
110
58
0
60
76||tt| |10
1
110
公称
通很
DN
15
20
25
32
40
50
65
80
100
125
150| |tt||(175)
200
(225）
250
蛋外很
D
系统2| |tt||120
130
150
160
170
210
260
290||tt ||360
385
440
475
535
580
670
连
表4
接
螺梓孔
中心圆
diameter
K
82
90||tt| |102
115
124
160
203
230
292
318
360
394
440
483
572
JB/T 79.4--94
PV20.0MPa管艺机北京尺
螺梓孔化合
1.
系列2
23
23
25
25
27
25
30
34
41
41
48
48| |tt||54
58
58
寸
quantity
4
4
4||tt ||4
4
8
8
8
12
12
12
12
12
16
双头軺柱
軺纹Th.
系列2bzxz.net
M20
M20| |tt||M22
M22
M24
M22
M27
M30
M36
M36||tt ||M42
M42
M48
M52
M52
工业面包装
P
55||tt ||62
买0
45
17250
8565
90
9
Ernux||tt| |6. 5
6. 5
6.5
16.5
759
6.5
12895
12
16511012
190160112| |tt||245190
12
270205
305240
1340275
3801305
8
0.8||tt ||0.8
(0.8
0.8
0.8
0.8
0.8
0.8
Flange
Thickness
26
28
30
32
34
40
48
54
0.8 66
1410
0.8
17
17
11| |tt||11
11
0.8
0.8
0.8
418330171110.8
30838023
141||tt ||0.8
761
mm
Flange neck
—Saax
R
Nmu
51|| tt||60
67
78
90
108
137
160
204||tt| |237
270
82
84
301
92340
1100377
110
448
18
20
21
23
25
29
36
40|| tt||52
weak 6
60
63
5
5
5
5||tt ||8
8
ao
10
10
10
7010
76
94 | | tt | | to | Standard flange sizes are interchangeable, and new product designs should give priority to Series 1 sizes.
Additional notes:
This standard is proposed and administered by the Machinery Standardization Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Machinery Standardization Research Institute of the Ministry of Machinery Industry and Harbin Boiler Factory. The drafters of this standard are Li Junying and Wu Zhenjia. 353
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