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Course Outline

After the second dive, the following details are known.

  • TOD: 15 m/49 ft.
  • Actual depth: 15 m/49 ft.
  • NDL: 33 min.
  • Actual time: 30 min.
  • Cylinder: 90 bar/1,323 psi (gas pressure on surface)

Calculating SAC

SAC is calculated by using the following information.

  • Gas used: 110 bar/1,677 psi or 1,221 L/44.72 cu. ft.

    110 bar × 11.1 L = 1,221 L

    80 cu. ft. × 1,323 ÷ 3,000 = 35.28 cu. ft.

    80 cu. ft. - 35.28 cu. ft. = 44.72 cu. ft.

  • Time: 35 minutes

    30 min. (Dive Time) + 2 min. (Ascent Time) + 3 min. (Safety Stop Time) = 35 min.

  • Average depth: 12 m/39 ft./2.2 bar

Metric

1,221 L ÷ 35 min. = 34.88 L p/m (RMV)


34.88 L ÷ 2.2 bar = 15.85 L p/m (~16 L p/m) (SAC)

Imperial

44.72 cu. ft. ÷ 35 min. = 1.28 cu. ft. p/m (RMV)


1.28 cu. ft. p/m ÷ 2.2 bar = 0.58 cu. ft. p/m (SAC)

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