This standard replaces JB 89-59. JB/T 89-1994 Metal ring gasket for pipeline flanges JB/T89-1994 Standard download and decompression password: www.bzxz.net

J15
JB
Mechanical Industry Standard of the People's Republic of China
Pipeline Flanges and Gaskets
Published on December 9, 1994
Published by the Ministry of Machinery Industry of the People's Republic of China
Implemented on October 1, 1995
Mechanical Industry Standard of the People's Republic of China
Metal Ring Gaskets for Pipeline Flanges
Subject Content and Scope of Application
This standard specifies the types, sizes and technical requirements for octagonal metal ring gaskets for steel pipe flanges. JB/T 89—94
JB89-59
This standard applies to metal ring gaskets for ring-joined integral cast steel pipe flanges and butt-welded steel pipe flanges with nominal pressure PN of 6.3, 10.0, 16.0, 20.0MPa as specified in JB/T79 and JB/T82, and references standards
2
GB699
GB1220
JB755
3
High-quality carbon structural steel
Stainless steel bars
Technical conditions
Pressure vessel forgings
Technical conditions
Type and size of gasket
The type and size of metal ring gaskets shall conform to the requirements of Figure 1 and Table 1. Figure 1
Approved by the Ministry of Machinery Industry on December 9, 1994
Implemented on October 1, 1995
101
Nominal
Diameter
DN
10
15
20
25
32
40
50
65
80||tt ||100
125
150
(175)
200
(225)
250
300
350
400
450
500
4
p
35
35
45
5 0
65
75
85
110
115
145
175
205
235
265
280
320
375
420
480
540
590|| tt||PN6.3MPs
A
8
00
8
2
2
2
11
11
11
11
11
11
13
Technical requirements
4.1
4. 2
c
5.5
5. 5
5. 5
5.
0
8
0
0
8
8
8
H
13
13
13
13
13
16
16
16
16
16
16
16
16
16
16
16
16
20
P
35
35
45
50
65|| tt||75
85
110
115
145
175
205
235
265
280
320
375
420
480
JB/T89-94
Table 1
PN10.0MPa
A
11
11
11
11
11
11
11
11
11
11
15.5
15. 5
C
5. 5
8
8
8
10. 5
10.5
H
13
6
16
16
16
16
16
16
22
22
35
160
190
205
255
275
305
330
380
PN16.0 MPa
A
11
11
13
15.5
15.5
15.5
21
c
5.5
5.5
5.5
5.5
5.5
90
00
9
10.5
10. 5bzxz.net
10.5
10.5
H
13
13
13
13
13
13
16
16
16
16
20
22
22
22
22
||28
P
40
40
45
50
65
75
95
110
160
190
205
240
275
305
330
380
PN20.0 MPs
A
8
8
11
11
11
13
15.5
15.5
15.5
21
The gasket material and applicable temperature range shall comply with the provisions of Table 2. Other technical requirements shall comply with the provisions of relevant standards. Table 2
Material name
08 or 10
oCr13
oCr19Ni9.oCr17Ni12Mo2
Standard
GB699
GB1220
GB1220
Maximum working degree
450
540
600
C
5.5
5. 5
5.5
5.5
5.5
9
10.5
10.5
10.5
10.5
14
mm
H
13
13
13
13| |tt||13
16
16
16
16
20
22
22||tt ||22
22
28
The hardness value of the metal ring gasket material should be 30~40HB lower than the hardness value of the flange material, and its maximum value should not exceed the requirements in Table 3 . Table 3
Material name
08 or 10
OCr13
OCr19Ni9
0Cr17Ni12Mo2
102
Maximum hardness value| |tt||HB
120
140
160
160
JB/T89-94
4.3 Hardness of metal ring pad It should be measured uniformly around the entire circle, symmetrically everywhere, and the average hardness should comply with the requirements in Table 3. 4.4 The metal ring gasket should be made of forgings and undergo appropriate heat treatment and mechanical processing. The plated parts should meet the "grade requirements" of JB755. The metal ring gasket is not allowed to be mixed.
4.5 The limit deviation of the metal ring gasket size should comply with The provisions of Table 4. Table 4
Name
Pitch P
Ring width A
Ring height H
Ring plane Width C
Angle 23*
Corner radius,
Limit deviation
± 0. 18
±0. 20
± 0. 40
±0. 20
±0. 5*
±0. 40
mm
4.6 Metal ring gasket sealing surface ( The octagonal pad bevel) shall not have scratches, marks, cracks and warts, and the surface roughness R. is 1.6um. 4.7 If the metal ring pad is cut from 08 or 10 steel, the surface should be coated with anti-rust oil after inspection. . 5 Marking and packaging
5.1 Metal ring pads should be packaged separately according to specifications and materials, and the product quality inspection certificate should be attached when delivered. 5.2 The manufacturer's trademark and Mark content such as nominal pressure, nominal diameter and material grade, 5.3 marking example
Octagonal metal ring gasket with nominal diameter 150mm, nominal pressure 10.0MPa, material 0Cr13: Octagonal gasket 150-100.0Cr13JB/T8994 additional Note:
This standard was proposed by the Mechanical Standardization Institute of the Ministry of Machinery Industry. This standard was drafted by the Mechanical Standardization Institute of the Ministry of Machinery Industry and Beijing Huaguang Seals Factory. The main drafters of this standard are Li Junying, Ye Baolong, and Li Xinhua, 103.
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