管径(mm)

最小

闭气

时间(h: m: s)

最小闭气时间对应管段长度L(m)

检测管段长度L(m)，相应的标准闭气时间T (h: m: s)

10 m

20 m

30 m

40 m

60 m

80 m

100 m

300

0:5:35

62

0:5:35

0:5:35

0:5:35

0:5:35

0:5:35

0:7:15

0:9:3

400

0:7:26

46

0:7:26

0:7:26

0:7:26

0:7:26

0:9:40

0:12:53

0:16:6

600

0:11:9

31

0:11:9

0:11:9

0:11:9

0:14:29

0:21:44

0:28:59

0:36:13

800

0:14:52

23

0:14:52

0:14:52

0:19:19

0:25:45

0:38:38

0:51:31

1:4:24

900

0:16:44

21

0:16:44

0:16:44

0:24:27

0:32:36

0:48:54

1:5:12

1:21:30

1000

0:18:35

18

0:18:35

0:20:7

0:30:11

0:40:15

1:0:22

1:20:30

1:40:37

1200

0:22:19

15

0:22:19

0:28:59

0:43:28

0:57:57

1:26:56

1:55:55

2:24:53

1300

0:24:10

14

0:24:10

0:34:1

0:51:1

1:8:1

1:42:2

2:16:2

2:50:3

1400

0:26:2

13

0:26:2

0:39:27

0:59:10

1:18:53

1:58:20

2:37:46

3:17:13

1500

0:27:53

12

0:27:53

0:45:17

1:7:55

1:30:33

2:15:50

3:1:7

3:46:23

1600

0:29:45

12

0:29:45

0:51:31

1:17:16

1:43:2

2:34:33

3:26:4

4:17:35

1700

0:31:36

11

0:31:36

0:58:9

1:27:14

1:56:19

2:54:28

3:52:38

4:50:47

1800

0:33:28

10

0:33:28

1:5:12

1:37:48

2:10:24

3:15:36

4:20:48

5:26:0

1900

0:35:19

10

0:36:19

1:12:39

1:48:58

2:25:17

3:37:56

4:50:35

6:3:14

2000

0:37:11

9

0:40:15

1:20:30

2:0:44

2:40:59

4:1:29

5:21:58

6:42:28