GroundRules
29 CFR Appendix A to Subpart S of Part 1926: Appendix A to Subpart S of Part 1926—Decompression Tables
Where this section sits in the code
- Title 29—Labor
- Subtitle B—Regulations Relating to Labor
- CHAPTER XVII—OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
- PART 1926—SAFETY AND HEALTH REGULATIONS FOR CONSTRUCTION
- Subpart S—Underground Construction, Caissons, Cofferdams and Compressed Air
1. Explanation. The decompression tables are computed for working chamber pressures from 0 to 14 pounds, and from 14 to 50 pounds per square inch gauge inclusive by 2-pound increments and for exposure times for each pressure extending from one-half to over 8 hours inclusive. Decompressions will be conducted by two or more stages with a maximum of four stages, the latter for a working chamber pressure of 40 pounds per square inch gauge or over.
Stage 1 consists of a reduction in ambient pressure ranging from 10 to a maximum of 16 pounds per square inch, but in no instance will the pressure be reduced below 4 pounds at the end of stage 1. This reduction in pressure in stage 1 will always take place at a rate not greater than 5 pounds per minute.
Further reduction in pressure will take place during stage 2 and subsequent stages as required at a slower rate, but in no event at a rate greater than 1 pound per minute.
Decompression Table No. 1 indicates in the body of the table the total decompression time in minutes for various combinations of working chamber pressure and exposure time.
Decompression Table No. 2 indicates for the same various combinations of working chamber pressure and exposure time the following:
a. The number of stages required;
b. The reduction in pressure and the terminal pressure for each required stage;
c. The time in minutes through which the reduction in pressure is accomplished for each required stage;
d. The pressure reduction rate in minutes per pound for each required stage;
Important Note:
The Pressure Reduction in Each Stage is Accomplished at a Uniform Rate. Do Not Interpolate Between Values Shown on the Tables. Use the Next Higher Value of Working Chamber Pressure or Exposure Time Should the Actual Working Chamber Pressure or the Actual Exposure Time, Respectively, Fall Between Those for Which Calculated Values Are Shown in the Body of the Tables.
Examples Minutes
Example No. 1: 4 hours working period at 20 pounds gauge.
Decompression Table No. 1: 20 pounds for 4 hours, total decompression time 43
Decompression Table No. 2:
Stage 1: Reduce pressure from 20 pounds to 4 pounds at the uniform rate of 5 pounds per minute.
Elapsed time stage 1: 16/5 3
Stage 2 (final stage): Reduce pressure at a uniform rate from 4 pounds to 0-pound gage over a period of 40 minutes.
Rate—0.10 pound per minute or 10 minutes per pound.
Stage 2 (final) elapsed time 40
Total time 43
Example No. 2: 5-hour working period at 24 pounds gage.
Decompression Table No. 1: 24 pounds for 5 hours, total decompression time 117
Decompression Table No. 2:
Stage 1: Reduce pressure from 24 pounds to 8 pounds at the uniform rate of 5 pounds per minute.
Elapsed time stage 1: 16/5 3
Stage 2: Reduce pressure at a uniform rate from 8 pounds to 4 pounds over a period of 4 minutes. Rate, 1 pound per minute elapsed time, stage 2 4
Transfer men to special decompression chamber maintaining the 4-pound pressure during the transfer operation.
Stage 3 (final stage): In the special decompression chamber, reduce the pressure at a uniform rate from 4 pounds to 0-pound gage over a period of 110 minutes. Rate, 0.037 pound per minute or 27.5 minutes per pound. Stage 3 (final) elapsed time 110
Total time 117
Decompression Table No. 1—Total Decompression Time
Work pressure p.s.i.g. Working period hours
1⁄2 1 11⁄2 2 3 4 5 6 7 8 Over 8
9 to 12 3 3 3 3 3 3 3 3 3 3 3
14 6 6 6 6 6 6 6 6 16 16 33
16 7 7 7 7 7 7 17 33 48 48 62
18 7 7 7 8 11 17 48 63 63 73 87
20 7 7 8 15 15 43 63 73 83 103 113
22 9 9 16 24 38 68 93 103 113 128 133
24 11 12 23 27 52 92 117 122 127 137 151
26 13 14 29 34 69 104 126 141 142 142 163
28 15 23 31 41 98 127 143 153 153 165 183
30 17 28 38 62 105 143 165 168 178 188 204
32 19 35 43 85 126 163 178 193 203 213 226
34 21 39 58 98 151 178 195 218 223 233 248
36 24 44 63 113 170 198 223 233 243 253 273
38 28 49 73 128 178 203 223 238 253 263 278
40 31 49 84 143 183 213 233 248 258 278 288
42 37 56 102 144 189 215 245 260 263 268 293
44 43 64 118 154 199 234 254 264 269 269 293
46 44 74 139 171 214 244 269 274 289 299 318
48 51 89 144 189 229 269 299 309 319 319
50 58 94 164 209 249 279 309 329
Decompression Table No. 2
[Do not interpolate, use next higher value for conditions not computed]
Working chamber pressure p.s.i.g. Working period hours Decompression data
Stage No. Pressure reduc. p.s.i.g. Time in stage minutes Pressure reduc. rate Min/pound Total time decompress minutes
From To
14 1⁄2 1 14 4 2 0.20 6
2 4 0 4 1.00 6
1 1 14 4 2 0.20 6
2 4 0 4 1.00 6
11⁄2 1 14 4 2 0.20 6
2 4 0 4 1.00 6
2 1 14 4 2 0.20 6
2 4 0 4 1.00 6
3 1 14 4 2 0.20 6
2 4 0 4 1.00 6
4 1 14 0 2 0.20 6
2 4 0 4 1.00 6
5 1 14 4 2 0.20 6
2 4 0 4 1.00 6
6 1 14 4 2 0.20
2 4 0 4 1.00 6
7 1 14 4 2 0.20
2 4 0 14 3.50 16
8 1 14 4 2 0.20
2 4 0 14 3.50 16
Over 8 1 14 4 2 0.20
2 4 0 30 7.50 32
16 1⁄2 1 16 4 3 0.20
2 4 0 4 1.00 7
1 1 16 4 3 0.20 7
2 4 0 4 1.00 7
11⁄2 1 16 4 3 0.20
2 4 0 4 1.00 7
2 1 16 4 3 0.20
2 4 0 4 1.00 7
3 1 16 4 3 0.20
2 4 0 4 1.00 7
4 1 14 4 3 0.20
2 4 0 4 1.00 7
5 1 14 4 3 0.20 7
2 4 0 4 3.50 17
6 1 14 4 3 0.20
2 4 0 30 7.50 33
7 1 14 4 3 0.20
2 4 0 45 11.25 48
8 1 14 4 3 0.20
2 4 0 45 11.25 48
Over 8 1 14 4 3 0.20
2 4 0 60 15.00 63
18 1⁄2 1 18 4 3 0.20
2 4 0 4 1.00 7
1 1 18 4 3 0.20
2 4 0 4 1.00 7
11⁄2 1 18 4 3 0.20
2 4 0 4 1.00 7
2 1 18 4 3 0.20
2 4 0 5 1.25 8
3 1 18 4 3 0.20
2 4 0 8 2.00 11
4 1 18 4 3 0.20
2 4 0 14 3.50 17
5 1 18 4 3 0.20
2 4 0 45 11.25 48
6 1 18 4 3 0.20
2 4 0 60 15.00 63
7 1 18 4 3 0.20
2 4 0 60 15.00 63
8 1 18 4 3 0.20
2 4 0 70 17.50 73
Over 8 1 18 4 3 0.20
2 4 0 84 21.00 87
20 1⁄2 1 20 4 3 0.20
2 4 0 4 1.00 7
1 1 20 4 3 0.20
2 4 0 4 1.00 7
11⁄2 1 20 4 3 0.20
2 4 0 5 1.25 8
2 1 20 4 3 0.20
2 4 0 12 3.00 15
3 1 20 4 3 0.20
2 4 0 12 3.00 15
4 1 20 4 3 0.20
2 4 0 40 10.00 43
5 1 20 4 3 0.20
2 4 0 60 15.00 63
6 1 20 4 3 0.20
2 4 0 70 17.50 73
7 1 20 4 3 0.20
2 4 0 80 20.00 83
8 1 20 4 3 0.20
2 4 0 100 25.00 103
Over 8 1 20 4 3 0.20
2 4 0 110 27.50 113
22 1⁄2 1 22 6 3 0.20
2 6 0 6 1.00 9
1 1 22 6 3 0.20
2 6 0 6 1.00 9
11⁄2 1 22 6 3 0.20
2 6 0 13 2.20 16
2 1 22 6 3 0.20
2 6 0 21 3.50 24
3 1 22 6 3 0.20
2 6 0 35 5.85 38
4 1 22 6 3 0.20
2 6 0 65 10.83 68
5 1 22 6 3 0.20
2 6 0 90 15.00 93
6 1 22 6 3 0.20
2 4 0 100 16.67 103
7 1 22 6 3 0.20
2 6 0 110 18.35 113
8 1 22 6 3 0.20
2 6 0 125 20.80 128
Over 8 1 22 6 3 0.20
2 6 0 130 21.70 133
24 1⁄2 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 4 1.00 11
1 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 5 1.25 12
11⁄2 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 16 4.00 23
2 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 20 5.00 27
3 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 45 11.25 52
4 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 85 21.25 92
5 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 110 27.50 117
6 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 115 28.80 122
7 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 120 30.00 127
8 1 24 8 3 0.20
2 8 4 4 1.00
3 4 0 130 32.50 137
Over 8 1 24 8 3 0.20
2 8 4 8 2.00
3 4 0 140 35.00 151
26 1⁄2 1 26 10 3 0.20
2 10 4 6 1.00
3 4 0 4 1.00 13
1 1 26 10 3 0.20
2 10 4 6 1.00
3 4 0 5 1.25 14
11⁄2 1 26 10 3 0.20
2 10 4 6 1.00
3 4 0 20 5.00 29
2 1 26 10 3 0.20
2 10 4 6 1.00
3 4 0 25 6.25 34
3 1 26 10 3 0.20
2 10 4 6 1.00
3 4 0 60 15.00 69
4 1 26 10 3 0.20
2 10 4 6 1.00
3 4 0 95 23.75 104
5 1 26 10 3 0.20
2 10 4 8 1.33
3 4 0 115 28.80 126
6 1 26 10 3 0.20
2 10 4 8 1.33
3 4 0 130 32.50 141
7 1 26 10 3 2.20
2 10 4 9 1.50
3 4 0 130 32.50 142
8 1 26 10 3 0.20
2 10 4 9 1.50
3 4 0 130 32.50 142
Over 8 1 26 10 3 0.20
2 10 4 30 5.00
3 4 0 30 32.50 163
28 1⁄2 1 28 12 3 0.20
2 12 4 8 1.00
3 4 0 4 1.00 15
1 1 28 12 3 0.20
2 12 4 8 1.00
3 4 0 12 3.00 23
11⁄2 1 28 12 3 0.20
2 12 4 8 1.00
3 4 0 20 5.00 31
2 1 28 12 3 0.20
2 12 4 8 1.00
3 4 0 30 7.50 41
3 1 28 12 3 0.20
2 12 4 10 1.25
3 4 0 85 21.20 98
4 1 28 12 3 0.20
2 12 4 14 1.75
3 4 0 110 27.50 127
5 1 28 12 3 0.20
2 12 4 20 2.50
3 4 0 120 30.00 143
6 1 28 12 3 0.20
2 12 4 20 2.50
3 4 0 130 32.50 153
7 1 28 12 3 0.20
2 12 4 20 2.50
3 4 0 120 32.50 153
8 1 28 12 3 0.20
2 12 4 32 4.00
3 4 0 130 32.50 165
Over 8 1 28 12 3 0.20
2 12 4 50 6.25
3 4 0 130 32.50 183
30 1⁄2 1 30 14 3 0.20
2 14 4 10 1.00
3 4 0 4 1.00 17
1 1 30 14 3 0.20
2 14 4 10 1.00
3 4 0 15 3.75 28
11⁄2 1 30 14 3 0.20
2 14 4 10 1.00
3 4 0 25 6.25 38
2 1 30 14 3 0.20
2 14 4 14 1.40
3 4 0 45 11.25 62
3 1 30 14 3 0.20
2 14 4 17 1.70
3 4 0 85 21.20 105
4 1 30 14 3 0.20
2 14 4 30 3.00
3 4 0 110 27.50 143
5 1 30 14 3 0.20
2 14 4 35 3.50
3 4 0 130 32.50 165
6 1 30 14 3 0.20
2 14 4 35 3.50
3 4 0 130 32.50 168
7 1 30 14 3 0.20
2 14 4 45 4.50
3 4 0 130 32.50 178
8 1 30 14 3 0.20
2 14 4 55 5.50
3 4 0 130 32.50 188
Over 8 1 30 14 3 0.20
2 14 4 71 7.10
3 4 0 130 32.50 204
32 1⁄2 1 32 16 3 0.20
2 16 4 12 1.00
3 4 0 4 1.00 19
1 1 32 16 3 0.20
2 16 4 12 1.00
3 4 0 20 5.00 35
11⁄2 1 32 16 3 0.20
2 16 4 15 1.25
3 4 0 25 6.25 43
2 1 32 16 3 0.20
2 16 4 22 1.83
3 4 0 60 15.00 85
3 1 32 16 3 0.20
2 16 4 28 2.33
3 4 0 95 23.75 126
4 1 32 16 3 0.20
2 16 4 40 3.33
3 4 0 120 30.00 163
5 1 32 16 3 0.20
2 16 4 45 3.75
3 4 0 130 32.50 178
6 1 32 16 3 0.20
2 16 4 60 5.00
3 4 0 130 32.50 193
7 1 32 16 3 0.20
2 16 4 70 5.83
3 4 0 130 32.50 203
8 1 32 16 3 0.20
2 16 4 80 6.67
3 4 0 130 32.50 213
Over 8 1 32 16 3 0.20
2 16 4 93 7.75
3 4 0 130 32.50 226
34 1⁄2 1 34 18 3 0.20
2 18 4 14 1.00
3 4 0 4 1.00 21
1 1 34 18 3 0.20
2 18 4 14 1.00
3 4 0 22 5.50 39
11⁄2 1 34 18 3 0.20
2 18 4 25 1.80
3 4 0 30 7.50 58
2 1 34 18 3 0.20
2 18 4 35 2.50
3 4 0 60 15.00 98
3 1 34 18 3 0.20
2 18 4 43 3.10
3 4 0 105 26.25 151
4 1 34 18 3 0.20
2 18 4 55 3.93
3 4 0 120 30.00 178
5 1 34 18 3 0.20
2 18 4 62 4.43
3 4 0 130 32.50 195
6 1 34 18 3 0.20
2 18 4 85 6.07
3 4 0 130 32.50 218
7 1 34 18 3 0.20
2 18 4 90 6.43
3 4 0 130 32.50 223
8 1 34 18 3 0.20
2 18 4 100 7.15
3 4 0 130 32.50 233
Over 8 1 34 18 3 0.20
2 18 4 115 8.23
3 4 0 130 32.50 248
36 1⁄2 1 36 20 3 0.20
2 20 4 16 1.00
3 4 0 5 1.25 24
1 1 36 20 3 0.20
2 20 4 16 1.00
3 4 0 25 6.25 44
11⁄2 1 36 20 3 0.20
2 20 4 30 1.88
3 4 0 30 7.50 63
2 1 36 20 3 0.20
2 20 4 40 2.50
3 4 0 70 17.50 113
3 1 36 20 3 0.20
2 20 4 52 3.25
3 4 0 115 28.75 170
4 1 36 20 3 0.20
2 20 4 65 4.06
3 4 0 130 32.50 198
5 1 36 20 3 0.20
2 20 4 90 5.63
3 4 0 130 32.50 223
6 1 36 20 3 0.20
2 20 4 100 6.25
3 4 0 130 32.50 233
7 1 36 20 3 0.20
2 20 4 110 6.88
3 4 0 130 32.50 243
8 1 36 20 3 0.20
2 20 4 120 7.50
3 4 0 130 32.50 253
Over 8 1 36 20 3 0.20
2 20 4 140 8.75
3 4 0 130 32.50 273
38 1⁄2 1 38 22 3 0.20
2 22 6 16 1.00
3 6 0 9 1.50 28
1 1 38 22 3 0.20
2 22 6 16 1.00
3 6 0 30 5.00 49
11⁄2 1 38 22 3 0.20
2 22 6 20 1.25
3 6 0 50 8.34 73
2 1 38 22 3 0.20
2 22 6 30 1.88
3 6 0 95 15.83 128
3 1 38 22 3 0.20
2 22 6 35 2.19
3 6 0 140 23.35 178
4 1 38 22 3 0.20
2 22 6 50 3.12
3 6 0 150 25.00 203
5 1 38 22 3 0.20
2 22 6 55 3.44
3 6 0 165 27.50 223
6 1 38 22 3 0.20
2 22 6 70 4.38
3 6 0 165 27.50 238
7 1 38 22 3 0.20
2 22 6 85 5.32
3 6 0 165 27.50 253
8 1 38 22 3 0.20
2 22 6 95 5.93
3 6 0 165 27.50 263
Over 8 1 38 22 3 0.20
2 22 6 110 6.88
3 6 0 165 27.50 278
40 1⁄2 1 40 24 3 0.20
2 24 8 16 1.00
3 8 4 4 1.00
4 4 0 8 2.00 31
1 1 40 24 3 0.20
2 24 8 16 1.00
3 8 4 5 1.25
4 4 0 25 6.25 49
11⁄2 1 40 24 3 0.20
2 24 8 16 1.00
3 8 4 20 5.00
4 4 0 45 11.25 84
2 2 40 24 3 0.20
1 24 8 25 1.56
3 8 4 20 5.00
4 4 0 95 23.75 143
3 1 40 24 3 0.20
2 24 8 30 1.88
3 8 4 30 7.50
4 4 0 120 30.00 183
4 1 40 24 3 0.20
2 24 8 45 2.81
3 8 4 35 8.75
4 4 0 130 32.50 213
5 1 40 24 3 0.20
2 24 8 47 2.94
3 8 4 53 13.25
4 4 0 130 32.50 233
6 1 40 24 3 0.20
2 24 8 55 3.44
3 8 4 60 15.00
4 4 0 130 32.50 248
7 1 40 24 3 0.20
2 24 8 65 4.06
3 8 4 60 15.00
4 4 0 130 32.50 258
8 1 40 24 3 0.20
2 24 8 75 4.70
3 8 4 60 15.00
4 4 0 130 32.50 268
Over 8 1 40 24 3 0.20
2 24 8 95 5.93
3 8 4 60 15.00
4 4 0 130 32.50 288
42 1⁄2 1 42 26 3 0.20
2 26 10 16 1.00
3 10 4 6 1.00
4 4 0 12 3.00 37
1 1 42 26 3 0.20
2 26 10 16 1.00
3 10 4 12 2.00
4 4 0 25 6.25 56
11⁄2 1 42 26 3 0.20
2 26 10 16 1.00
3 10 4 23 3.83
4 4 0 60 15.00 102
2 1 42 26 3 0.20
2 26 10 16 1.00
3 10 4 30 5.00
4 4 0 95 23.75 144
3 1 42 26 3 0.20
2 26 10 16 1.00
3 10 4 50 8.34
4 4 0 120 30.00 189
4 1 42 26 3 0.20
2 26 10 17 1.06
3 10 4 65 10.83
4 4 0 130 32.50 215
5 1 42 26 3 0.20
2 26 10 27 1.69
3 10 4 85 14.18
4 4 0 130 32.50 245
6 1 42 26 3 0.20
2 26 10 27 1.69
3 10 4 100 16.67
4 4 0 130 32.50 260
7 1 42 26 3 0.20
2 26 10 30 1.88
3 10 4 100 16.67
4 4 0 130 32.50 263
8 1 42 26 3 0.20
2 26 10 35 2.19
3 10 4 100 16.67
4 4 0 130 32.50 268
Over 8 1 42 26 3 0.20
2 26 10 60 3.75
3 10 4 100 16.67
4 4 0 130 32.50 293
44 1⁄2 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 8 1.00
4 4 0 16 4.00 43
1 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 20 2.50
4 4 0 25 6.25 64
11⁄2 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 27 3.38
4 4 0 72 18.00 118
2 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 40 5.00
4 4 0 95 23.75 154
3 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 60 7.50
4 4 0 120 30.00 199
4 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 85 10.62
4 4 0 130 32.50 234
5 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 105 13.13
4 4 0 130 32.50 254
6 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 115 14.38
4 4 0 130 32.50 264
7 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 120 15.00
4 4 0 130 32.50 269
8 1 44 28 3 0.20
2 28 12 16 1.00
3 12 4 120 15.00
4 4 0 130 32.50 269
Over 8 1 44 28 3 0.20
2 28 12 40 2.50
3 12 4 120 15.00
4 4 0 130 32.50 293
46 1⁄2 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 10 1.00
4 4 0 15 3.75 44
1 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 25 2.50
4 4 0 30 7.50 74
11⁄2 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 35 3.50
4 4 0 85 21.20 139
2 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 47 4.70
4 4 0 105 26.25 171
3 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 65 6.50
4 4 0 130 32.50 214
4 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 95 9.50
4 4 0 130 32.50 244
5 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 120 12.00
4 4 0 130 32.50 269
6 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 125 12.50
4 4 0 130 32.50 274
7 1 46 30 3 0.20
2 34 14 16 1.00
3 10 4 140 14.00
4 4 0 130 32.50 289
8 1 46 30 3 0.20
2 30 14 16 1.00
3 14 4 150 15.00
4 4 0 130 32.50 299
Over 8 1 46 30 3 0.20
2 30 14 25 1.56
3 14 4 160 16.00
4 4 0 130 32.50 318
48 1⁄2 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 12 1.00
4 4 0 20 5.00 51
1 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 35 2.92
4 4 0 35 8.75 89
11⁄2 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 45 3.75
4 4 0 80 20.00 144
2 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 60 5.00
4 4 0 110 27.50 189
3 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 90 7.50
4 4 0 120 30.00 229
4 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 120 10.00
4 4 0 130 32.50 269
5 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 140 11.67
4 4 0 130 32.50 209
6 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 160 13.33
4 4 0 130 32.50 309
7 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 170 14.17
4 4 0 130 32.50
8 1 48 32 3 0.20
2 32 16 16 1.00
3 16 4 170 14.17
4 4 0 130 32.50
50 1⁄2 1 50 34 3 0.20
2 34 18 16 1.00
3 18 4 14 1.00
4 4 0 25 6.25 58
1 1 50 34 3 0.20
2 34 18 16 1.00
3 18 4 40 2.86
4 4 0 35 8.75 94
11⁄2 1 50 34 3 0.20
2 34 18 16 1.00
3 18 4 55 3.93
4 4 0 90 22.50 164
2 1 50 34 3 0.20
2 34 18 16 1.00
3 18 4 70 5.00
4 4 0 120 30.00 209
3 1 50 34 3 0.20
2 34 18 16 1.00
3 18 4 100 7.15
4 4 0 130 32.50 249
4 1 50 34 3 0.20
2 34 18 16 1.00
3 18 4 130 8.58
4 4 0 130 32.50 279
5 1 50 34 3 0.20
2 34 18 16 1.00
3 18 4 160 11.42
Decompression Table No. 2—Continued
[Do not interpolate, use next higher value for conditions not computed]
Working chamber pressure p.s.i.g. Working period hours Decompression data
Stage No. Pressure reduc. p.s.i.g. Time in stage minutes Pressure reduc. rate Min/pound Total time decompress minutes
From To
4 4 0 130 32.50 309
6 1 50 34 3 0.20
2 34 18 16 1.00
3 18 4 180 12.85
4 4 0 130 32.50 329
Collected 2026-08-27T02:25:20Z. Source file · JSON