This standard replaces JB 88-59. This standard specifies the type, size and technical requirements for metal toothed gaskets for steel pipe flanges. This standard is applicable to metal toothed gaskets for butt-welded steel pipe flanges with concave and convex surface integral cast steel pipe flanges with a nominal pressure PN of 4.0~16.0MPa specified in JB/T 79 and JB/T 82. JB/T 88-1994 Metal toothed gasket for pipeline flange JB/T88-1994 Standard download and decompression password: www.bzxz.net

J15 | | tt | | JB | Ministry of Industry
Published
Implemented on 1995-10-01
Machinery Industry Standard of the People's Republic of China
Metal toothed gaskets for pipeline flanges
1 Subject content and applicable scope
This standard specifies the type, size and technical requirements of metal toothed gaskets for steel pipe flanges JB/T88—94
JB88-59| |tt||This standard applies to metal toothed gaskets for integral cast steel pipe flanges with concave and convex surfaces and butt welded pipe flanges with a nominal pressure PN of 4.0 to 16.0MPa specified in JB/T79 and JB/T82. Reference standardsbzxZ.net
2
GB711
GB4237
High-quality carbon structural steel hot-rolled thick steel plate and wide steel strip stainless steel hot-rolled steel plate
3 gaskets The type and size of
3.1 The type of metal tooth gasket used for the concave and convex surface pipe flange with nominal pressure PN of 4.0, 6.3, 10.0 and 16.0MPa is as specified in Figure 1, and the size is as specified in Table 1.
3.2 The type of metal toothed gasket used for the concave and convex surface pipe flange with a nominal pressure PN of 20.0MPa shall be as specified in Figure 1, and the dimensions shall be as specified in Table 2.
d
De
Figure 1
Approved by the Ministry of Machinery Industry on 1994-12-09
29o
Implemented on 1995-10-01
97
nominal diameter
DN
10
15
20
25
32
40
50
65
80
100
125
150
175|| tt||200
225
250
300
350
400
450
500||tt| |600
700
800
98
Gasket outer diameter
D
34
39||tt ||50
57
65
75
87
109
120
149
175
203
233
259
286
312
363
421
473| |tt||523
575
675/677
777/767
882/875
JB/T88-94
Table 1
nominal pressure PN
gasket inner diameter
d.
13
18
23
27| |tt||35
45
57
76
87
105
131
155||tt ||185
211
234
260
311
361
413
463
515
513
703
811
Tooth pitch
1.5
1.5
1.5
1.5
1.5
1.5
1. 5
1.5
1.5
2
2
2
2
2
2
2
2
2
2
2|| tt||2
2
2
2
4. 0,6.3,10. 0.16.0 MPa
top width||tt ||0. 2
0. 2
0. 2
0. 2
0. 2
0. 2
0. 2
0. 2
0.2
0. 3
0. 3
0. 3
0.3||tt ||0. 3
0. 3
0. 3
0. 3
0.3
0, 3
0. 3
0. 3
0. 3
0. 3
0. 3
Forbidden film thickness
6||tt| |3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4|| tt||4
4
4
5
5
5
5
High||tt| |Tooth
5
0. 65
0. 65
0. 65
0.65
0. 65||tt| |0. 65
0. 65
0. 65
0. 65
0.85
0.85
0.85||tt| |0. 85
0.85
0.85
0. 85
0. 85
0.85
0.85
0.85
0.85
0.85
0. 85
0.85
mm
Number of teeth
out
9
10
10
10
10
11
11
11
11|| tt||12
12
12
13
13
13
15
15||tt| |15
15
16
16
16
nominal diameter
DN
15||tt| |20
25
32
40
50
65
80
100
125
150
175
200
225
250
Technical requirements
4.1
Gasket Outer diameter
De
27
34
41
49
55
69
96
115
137
169
189
213
244
267
318|| tt||Gasket inner diameter
d
15
22
26
34
40
St|| tt||72
88
105
133
153
177
204
227||tt| |258
JB/T88-94
Table 2
Nominal pressure PN
Tooth pitch
1.5
1.5||tt| |1.5
1.5
1. 5
1.5
1.5
1.5
2
2
2
2
2
2
2| |tt||20.0MPa
Tooth width
c
0. 2
0. 2
0. 2
0 . 2
0. 2
0. 2
0. 2
0.2
0. 3
0.3||tt| |0.3
0.3
0. 3
0.3
0.3
Gasket thickness
6
3|| tt||8
3
3
3
3
4
4
4||tt| |4
4
Tooth
High
A
0. 65
0. 65
0.65|| tt||0. 65
0. 65
0. 65
0. 65
0. 65
0.85
0.85
0.85
0. 85
0. 85
0. 85
0.85
The gasket material and applicable temperature range should comply with Table 3, other technical requirements should comply with the provisions of the corresponding standards. Table 3
Material name
08 or 10
oCr13
oCr19Ni9
00Cr17Ni12Mo2
Biaoxiong
GB711|| tt | |Limit deviation
+1.0
0
Gasket outer diameter D.
Limit deviation
0
1.0
Highest working precision
450
540
600||tt| |450
Gasket thickness:
Limit deviation
+0.25
0
4.3 The parallelism error of both ends of the metal toothed pad is per 100mm diameter The length shall not exceed 0.1mm. 4.4 The surface roughness R of the tooth surface of the metal toothed pad is 1.6 μm. 4.5 The metal toothed pad should be made of a whole steel plate, and tailor welding is not allowed. mm
Tooth
Effect
n
4
4
5
5
8| |tt||o
8
9
9
9
10
10
15||tt ||mm
mm
99
5 Marking and packaging
JB/T88-94
5.1 Gaskets should be packaged separately according to specifications and materials, and delivered The goods should be accompanied by a quality inspection certificate and labeled with the contents specified in Article 5.2. 5.2 Marking example
Metal toothed gasket for concave and convex surface pipe flange with nominal diameter 100mm, nominal pressure 6.3MPa, material 0Cr19Ni9: full tooth shape 100-630Cr19Ni9JB/T88-94 Additional instructions: ||tt ||This standard is proposed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Mechanical Standardization Research Institute of the Ministry of Machinery Industry and Beijing Huaguang Seals Factory. The drafters of this standard are Li Junying, Ye Baolong and Li Xinhua. 100
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