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

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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)
35 310
40 200
50 100
60 60
70 50
80 40
90 30
100 25
110 20
120 15
130 10

(Source: U.S. Navy Diving Manual, 1 September 1973.)

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United States Code

Title 46 published on 09-May-2017 04:27

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

  • 2015-08-24; vol. 80 # 163 - Monday, August 24, 2015
    1. 80 FR 51173 - Commercial Diving Operations—Reopening of Comment Period
      GPO FDSys XML | Text
      Notice of proposed rulemaking; reopening of comment period.
      The comment period for the notice of proposed rulemaking published on February 19, 2015 (80 FR 9152), is reopened. Comments and related material must be submitted to the docket by October 23, 2015. Comments sent to the Office of Management and Budget (OMB) on collection of information must reach OMB on or before October 23, 2015.
      46 CFR Parts 8 and 197