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Welded pipe joints (31.5MPa)
I. Overview
Applicable to welded pipe joints for pipeline systems with oil as the medium. The nominal pressure is 31.5MPa and the working temperature is -25 ~ + 80 ℃.
Welded end straight pipe joint, welded end straight pipe joint, welded straight pipe joint, welded right angle pipe joint, welded four way pipe joint, welded bulkhead straight pipe joint, welded bulkhead right pipe joint, welded The types and sizes of the branch pipe joints and welded articulated pipe joints are according to the regulations in Figures 1 to 10 and Table 1.
Structure form
3. Dimensions

Tube diameter Do
Nominal diameter DN
d
d1
d2
d3
d4 (H12 / h12)
d5
D + 0.6 / + 0.44
l
l1
l2
6
3

M10X1
7.5
10
6.5
7
12
8
14
32
10
6
M10X1
11
10
10.5
11
twenty two
16
8
16.5
35
10
6
M14X1.5
11
14
12
16.5
35
14
8
M14X1.5
16
14
14.5
16
28
twenty two
12
19
43
14
8
M18X1.5
16
19
12
twenty one
43
18
10
M18X1.5
19
19
18.5
19
36
27
12
twenty one
45
18
10
M22X1.5
19
twenty four
14
twenty one
45
twenty two
15
M22X1.5
twenty two
twenty four
22.5
twenty two
46
30
14
twenty one
48
twenty two
15
M27X2
twenty two
28
16
twenty one
48
28
20
M27X2
28
28
28.5
28
56
36
16
twenty four
54
28
20
M33X2
28
34
16
twenty four
54
34
25
M33X2
34
34
34.5
34
64
42
16
26
65
34
25
M42X2
34
44
18
26
65
42
32
M42X2
42
44
42.5
42
78
52
18
28
72
42
32
M48X2
42
50
20
28
72
50
40
M48X2
50
50
50.5
50
90
60
20
30
78
Tube diameter Do
Nominal diameter DN
l3
l4
L
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
L11
6
3
3
twenty two
54
30
twenty four
12
twenty two
41
26
20
10
6
4
8
24.5
59.5
32.5
28.5
15
25.5
44.5
30.5
21.5
twenty three
8.5
15
10
6
25.5
60.5
14
8
5
10
29
72
41
35
20
29
49
38
27
29
11
20
14
8
29
72
18
10
7
12
33
78
45
39
twenty two
33
51
42
29

34

13
25
18
10
33
78
twenty two
15
8
14
34
82
48
43
26
35
55
46
30
43
17
30
twenty two
15
35
83
28
20
9
15
37
91
53
48
30
39
57
51
32
50
20
35
28
20
39
93
34
25
10
16
46
111
62
57
36
46
62
61
37
66
27
twenty four
34
25
48
113
42
32
12
17
50
122
68
64
40
48
68
68
39
82
34
30
42
32
52
124
50
40
15
19
56
134
76
74
48
54
74
78
43
94
38
33
Tube outer diameter Do
Nominal diameter DN
S
S1
S2
S3
S4
S5
S6
S7
O-ring JB / ZQ4224
washer
6
3
17
14
14
14
10
17
17
8X1.9
10
10
6
17
19
17
17
14
twenty two
twenty two
17
11X1.9
10
10
6
19
19
19
11X1.9
14
14
8
twenty two
27
twenty two
twenty two
19
30
27
19
16X1.9
14
14
8
twenty four
27
twenty four
16X1.9
18
18
10
27
32
27
27
twenty four
36
32
twenty four
20X2.4
18
18
10
30
32
30
20X2.4
twenty two
twenty two
15
30
36
30
30
27
41
36
30
24X2.4
twenty two
twenty two
15
36
36
24X2.4
27
28
20
36
41
36
36
32
50
41
36
30X3.1
27
28
20
41
41
41
30X3.1
33
34
25
46
50
46
46
41
55
50
41
35X3.1
33
34
25
55
50
55
35X3.1
42
42
32
55
60
55
55
50
65
60
55
40X3.1
42
42
32
60
60
60
40X3.1
48
50
40
65
70
65
65
60
70
70
60
45X3.1
48
Tube outer diameter Do
Nominal diameter DN
Weight kg
JB966-77
JB1883-77
JB970-77
JB971-77
JB972-77
JB973-77
JB974-77
JB975-77
JB977-77
JN978-77
6
3
0.039
0.052
0.028
0.032
0.064
0.087
0.077
0.096
0.021
10
6
0.060
0.082
0.055
0.068
0.145
0.190
0.158
0.183
0.046
0.059
10
6
0.071
0.103
14
8
0.143
0.210
0.150
0.160
0.370
0.5
0.344
0.366
0.12
0.103
14
8
0.155
0.235
18
10
0.199
0.325
0.190
0.250
0.510
0.680
0.505
0.53
0.160
0.190
18
10
0.236
0.356
twenty two
15
0.270
0.436
0.240
0.310
0.650
0.880
0.6
0.67
0.210
0.342
twenty two
15
0.320
0.480
28
20
0.390
0.620
0.370
0.470
0.920
1.250
0.95
1.02
0.280
0.660
28
20
0.450
0.640
34
25
0.600
1.000
0.630
0.760
1.530
2.180
1.68
1.97
0.470
1.320
34
25
0.850
1.224
42
32
1.060
1.624
1.050
1.220
2.400
3.800
2.03
2.53
0.670
2.140
42
32
1.170
1.730
50
40
1.670
2.430
1.570
2.050
3.9
5.300
3.34
3.84
1.050
3.330
Fourth, the mark description
a. Welded end straight pipe joint with pipe outer diameter D0 of 18mm, thread diameter d of 22mm and pitch of 1.5mm:
18-M22 1.5 JB / 966-77
b. Welded end straight pipe joint with pipe outer diameter D0 of 18mm, thread diameter d of 22mm and pitch of 1.5mm
Pipe connector 18-M22 1.5 JB / 1883-77
c. Welded end straight pipe joint with outer diameter D0 of 28mm:
Pipe joint 28 JB970-77
d. Welded right-angle pipe joint with outer diameter D0 of 28mm:
Pipe joint 28 JB971-77
e. Welded tee joint with outer diameter D0 of 18mm:
Pipe joint 18 JB972-77
f. Welded four-way pipe joint with outer diameter D0 of 18mm:
Pipe joint 18 JB973-77
g. Welded bulkhead straight pipe joint with outer diameter D0 of 28mm:
Pipe joint 28 JB974-77
h. Welded bulkhead straight angle pipe joint with outer diameter D0 of 28mm:
Pipe joint 28 JB975-77
i. Welded pipe joint with outer diameter D0 of 28mm:
Pipe joint 28 JB977-77
j. A-type welded hinge joint with outer diameter D0 of 28mm:
Pipe joint 28A JB978-77
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Address: Chengdong Industrial Park, Qidong City Phone: 0513-83660308, 83905568 Fax: 0513-83660318 Email: djrh888@163.com