46 CFR Part 197, Appendix A to Part 197 - Air No-Decompression Limits

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View PDF at GPO Pt. 197, App. A
Appendix A to Part 197—Air No-Decompression Limits
The following table gives the depth versus bottom time limits for single, no-decompression, air dives made within any 12-hour period. The limit is the maximum bottom time in minutes that a diver can spend at that depth without requiring decompression beyond that provided by a normal ascent rate of 60 fsw per minute. (Although bottom time is concluded when ascent begins, a slower ascent rate would increase the bottom time thereby requiring decompression.) An amount of nitrogen remains in the tissues of a diver after any air dive, regardless of whether the dive was a decompression or no-decompression dive. Whenever another dive is made within a 12-hour period, the nitrogen remaining in the blood and body tissues of the diver must be considered when calculating his decompression.
Air No-Decompression Limits
Depth (feet): No-decompression limits (minutes)
(Source: U.S. Navy Diving Manual, 1 September 1973.)
35 310
40 200
50 100
60 60
70 50
80 40
90 30
100 25
110 20
120 15
130 10

Title 46 published on 2013-10-01

no entries appear in the Federal Register after this date.

Title 46 published on 2013-10-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 46 CFR 197 after this date.

  • 2014-05-08; vol. 79 # 89 - Thursday, May 8, 2014
    1. 79 FR 26391 - Workplace Safety and Health for Merchant Mariners
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      Request for comments on petition for rulemaking.
      Comments and related material must either be submitted to our online docket via http://www.regulations.gov on or before August 6, 2014, or reach the Docket Management Facility by that date.
      33 CFR Parts 140, 142, and 150