Code of Federal Regulations > Title 29 > Chapter XVII > Part 1926 > Subpart S > Appendix Appendix A - Appendix A to Subpart S of Part 1926

Regulations last checked for updates: Nov 22, 2024

Title 29 - Labor last revised: Oct 31, 2024

Appendix Appendix A - Appendix A to Subpart S of Part 1926—Decompression Tables

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
Work pressure p.s.i.g.	1/2	1	1 1/2	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
		Stage No.	From	To	Time in stage minutes	Pressure reduc. rate Min/pound	Total time decompress minutes
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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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
	1 1/2	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 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
	Stage No.	From	To	Time in stage minutes	Pressure reduc. rate Min/pound	Total time decompress minutes
	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

[44 FR 8577, Feb. 9, 1979; 44 FR 20940, Apr. 6, 1979, as amended at 58 FR 35311, June 30, 1993]

authority: 40 U.S.C. 3704; 29 U.S.C. 653,655,and; and Secretary of Labor's Order No. 12-71 (36 FR 8754), 8-76 (41 FR 25059), 9-83 (48 FR 35736), 1-90 (55 FR 9033), 6-96 (62 FR 111), 3-2000 (65 FR 50017), 5-2002 (67 FR 65008), 5-2007 (72 FR 31159), 4-2010 (75 FR 55355), 1-2012 (77 FR 3912), or 8-2020 (85 FR 58393), as applicable; and 29 CFR part 1911, unless otherwise noted

source: 44 FR 8577, Feb. 9, 1979; 44 FR 20940, Apr. 6, 1979, unless otherwise noted.