管道口徑尺寸換算

公稱尺寸inch

inch

公稱通徑DN

國標A

國標B

美標

日標

1/8"

6

10.3

1/4"

8

13.7

3/8"

10

17.1

1/2"

0.840

15

21.3

18

21.3

3/4"

1.050

20

26.9

25

26.7

27.2

1"

1.315

25

33.7

32

33.4

34

11/4"

1.660

32

42.4

38

42.2

42.7

11/2"

1.900

40

48.3

45

48.3

48.6

2"

2.375

50

60.3

57

60.3

60.5

21/2"

2.875

65

76.1

76

73.0

76.3

3"

3.500

80

88.9

89

88.9

89.1

31/2"

90

101.6

101.6

4"

4.500

100

114.3

108

114.3

114.3

5"

5.563

125

139.0

133

141.3

139.80

6"

6.625

150

168.3

159

168.3

165.20

8"

8.625

200

219.1

219

219.1

216.30

10"

10.750

250

273.0

273

273.1

267.40

12"

12.750

300

323.9

325

323.9

318.50

14"

14.000

350

355.6

377

355.6

355.60

16"

16.000

400

406.4

426

406.4

406.40

18"

18.000

450

457.0

478

457.2

457.20

20"

20.000

500

508.0

529

508.0

508.00

22"

22.000

550

559.0

558.8

558.00

24"

24.000

600

610.0

630

609.6

609.60

26"

26.000

650

660.0

660.4

660.40

28"

28.000

700

711.0

720

711.2

711.20

30"

30.000

750

762.0

762.0

762.00

32"

32.000

800

813.0

820

812.8

812.80

34"

34.000

850

864.0

863.6

863.60

36"

36.000

900

914.0

920

914.4

914.40

38"

38.000

950

965.0

965.2

965.20

40"

40.000

1000

1016.0

1020

1016.0

1016.00

42"

42.000

1050

1067.0

1066.8

1066.80

44"

44.000

1100

1118.0

1120

1117.6

1117.60

46"

46.000

1150

1168.0

1168.4

1168.40

48"

48.000

1200

1219.0

1220

1219.2

1219.20