Nominal Pipe Size

Outside Diameter at Bevel

Length

Radius of Fillet

Diameter of Lap

A 型

B 型

NPS

D

L

R

G

1/2
3/4
1

21.3
26.7
33.4

51
51
51

3.0
3.0
3.0

0.8
0.8
0.8

35
43
51

11/4
11/2
2

42.2
48.3
60.3

51
51
64

5.0
6.0
8.0

0.8
0.8
0.8

64
73
92

21/2
3
31/2

73.0
88.9
101.6

64
64
76

8.0
10.0
10.0

0.8
0.8
0.8

106
127
140

4
5
6

114.3
141.3
168.3

76
76
89

11.0
11.0
13.0

0.8
1.6
1.6

157
185
218

8
10
12

219.1
273.0
323.8

102
127
152

13.0
13.0
13.0

1.6
1.6
1.6

270
324
381

14
16
18

355.6
406.4
457.0

152
152
152

13.0
13.0
13.0

1.6
1.6
1.6

413
470
533

20
22
24

508.0
559.0
610.0

152
152
152

13.0
13.0
13.0

1.6
--
1.6

584
641
692

Minimum lap thickness shall not be less than nominal wall thickness.
Contact faces of stub ends shall have a concentric serration or spiral according to the purchaser's requirements.
These lengths and radius apply for schedule 40s or thinner stainless steel pipes.
Radius of fillet B is only effective to MSS SP-43 lap joint stub ends.