Compressed Air Work And Diving 1909
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14
COMPRESSED AIR WORK.
TABLE V.
For Caisson and Tunnel Work.
Working Pressure in Pounds perSquare Inch. Pressure in Purgatory Lock in Pounds per Square Inch. Time in Minutes to be spent in Purgatory Air-Lock.
After 20 ininutes’ exposure. After 40 minutes’ exposure. After 1 hour’s exposure. After 2 hours’ exposure. After 3 hours’ exposure. After 4 hours’ exposure. After 6 hours’ exposure, or over.
•21 u 1 2 3 4
22 2 i 2 4 5 8 10
23 Q 3 5 8 11 15
•24 2A 1 3 4 7 11 14 20
‘2. > 3 2 3 5 9 13 18 26
26 9 4 (i 11 16 22 32
27 4 2 5 7 13 19 25 38
28 3 5 8 15 23 30 44
•29 •) 3 (i 9 18 26 35 50
30 ty 4 7 11 20 30 40 56
.31 6 4 8 12 23 35 45 62
32 4 9 14 27 40 50 68
.33 7 5 10 15 30 45 56 74
34 7J 5 11 17 34 50 63 80
35 8 (i 12 1!) 38 56 70 86
36 84 7 13 •21 42 62 76 92
37 S) 8 15 23 46 68 83 100
38 9| 8 17 25 50 74 90 108
39 9* 9 19 27 55 81 96 114
40 10 10 20 29 00 87 103 120
41 lOj 11 22 32 66 95 110 128
42 11 12 24 35 72 102 118 134
43 1U 13 26 38 78 110 126 142
44 12 14 •28 41 85 120 134 150
45 124 15 30 4.5 92 128 142 160
The figures in italic type are for emergency use only.