46 C.F.R. Appendix A to Part 197—Air No-Decompression Limits
Title 46 - Shipping
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.
Title 46: Shipping
PART 197—GENERAL PROVISIONS
Subpart C—Benzene
Appendix A to Part 197—Air No-Decompression Limits
Air No-Decompression Limits No-decompression Depth (feet): 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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