Scuba Bottle Floodable Volume

FV = Cylinder Floodable Volume in cubic feet N = Number of cylinders PI = Initial pressure in psig PR = Reserve pressure in psig

Example: A set of twin 80-cubic foot scuba cylinders is charged to 2,800 psig. The floodable volume of one cylinder is 0.399 cubic foot.

After equalization, a reserve pressure of 250 psig is assumed.

CDC . 0.399 x 2 x (2, 800- 250) EBS volume available = -^--

The following floodable volume numbers are provided for reference:

Scuba 72 0.420

Scuba 80 0.399

Scuba 90 0.398

K Bottle 1.620

EBS II Bottle 0.926

The volume of gas available in the EBS II may be obtained from its O&M technical manual, Appendix B.

The above formula may be rearranged as shown below to determine the minimum bank pressure that will just provide the required EBS volume (Vr):

17-10.5.4 EBS Deployment Procedures.

1. When directed by the Diving Supervisor, the EBS tender shall attach the EBS to either a descent line or the diver's marker float and lower the EBS to 10 fsw below the diver's first decompression stop.

2. Upon arrival at the EBS, the diver(s) shall signal arrival at the EBS (one on the lazy shot). The EBS tender shall report signal receipt to the Diving Supervisor, who will control the divers' ascent to the first decompression stop and continue to control their ascent and stops throughout in-water decompression.

17-10.6 Omitted Decompression. Certain emergencies may interrupt or prevent specified decompression. UBA failure, exhausted diluent or oxygen gas supply, and bodily injury are examples that constitute such emergencies. Omitted decompression must be made up to avoid later difficulty. Table 17-13 contains specific guidance for the initial management of omitted decompression in an asymptomatic MK 16 diver. For further information on omitted decompression, see Chapter 21.

17-10.6.1 At 20 fsw or Shallower. If the deepest decompression stop omitted is 20 fsw or shallower, the diver may be returned to the water stop at which the omission occurred.

■ If the surface interval was less than 1 minute, add 1 minute to the stop time and resume the planned decompression at the point of interruption.

■ If the surface interval was greater than 1 minute, compute a new decompression schedule by multiplying the 20- and/or 10-foot stop time(s) by 1.5. After

Deepest Decompression Stop Omitted

Decompression Status




Chamber Available

No Chamber Available


No decompression stops required

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