DIVING MEDICAL TECHNICIAN REFERENCE and FORMULAS
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DIVING MEDICAL TECHNICIAN REFERENCE and FORMULAS NOAA Diving Program Appendix H:Layout 1 1/7/11 11:29 AM Page H-3 NOAA NO-DECOMPRESSION TABLE MULTIPLE AIR DIVES WARNING: EVEN STRICT COMPLIANCE WITH THESE CHART 1 — DIVE TIMES WITH END-OF-DIVE GROUP LETTER CHARTS WILL NOT GUARANTEE AVOIDANCE OF MAXIMUM DIVE TIME REQUIRING DECOMPRESSION STOP 00 DECOMPRESSION SICKNESS. CONSERVATIVE USAGE 00 IS STRONGLY RECOMMENDED. DEPTH NO-STOP TIME MINUTES REQUIRED AT 20 fsw (6.1 msw) 00 msw fsw 180 12.2 40 12 20 27 36 44 53 63 73 84 95 108 121 135 151 163 14 RNT RESIDUAL NITROGEN TIME 130 150 + ABT ACTUAL BOTTOM TIME 13.7 45 11 17 24 31 39 46 55 63 72 82 92 102 114 125 2 25 100 110 130 ESDT EQUIVALENT SINGLE DIVE TIME 15.2 50 80 89 4 8 34 (USE ESDT TO 9 15 21 28 34 41 48 56 63 71 92 DETERMINE 80 90 100 END-OF-DIVE 16.8 55 8 14 19 25 31 37 43 50 56 63 71 74 4 10 17 LETTER GROUP) 65 80 90 18.3 60 7 12 17 22 28 33 39 45 51 57 60 2 14 23 55 60 70 THESE CHARTS ARE BASED ON THE U.S. NAVY AIR DECOMPRESSION 21.3 70 6 10 14 19 23 28 32 37 42 47 48 9 14 24 TABLES 7, 8, & 9 REV. 6 45 50 60 24.4 80 5 9 12 16 20 24 28 32 36 39 10 17 30 35 40 45 27.4 90 4 7 11 14 17 21 24 28 30 4 14 23 30 35 40 30.5 100 4 6 9 12 15 18 21 25 3 15 26 25 30 35 33.5 110 3 6 8 11 14 16 19 20 3 14 27 20 25 30 36.6 120 3 5 7 10 12 15 2 8 24 15 20 25 39.6 130 2 4 6 9 10 1 4 17 O Z fsw 40 45 50 55 60 70 80 90 100 110 120 130 msw 12.2 13.7 15.2 16.8 18.3 21.3 24.4 27.4 30.5 33.5 36.6 39.6 GROUP LETTER 13 12 11 10 9 8 7 6 5 5 5 4 2:20 3:36 4:31 5:23 6:15 7:08 8:00 8:52 9:44 10:36 11:29 12:21 13:13 14:05 14:58 15:50 150 113 81 64 51 40 32 24 20 15 10 6 A :10 1:17 2:12 3:04 3:56 4:49 5:41 6:33 7:25 8:17 9:10 10:02 10:54 11:46 12:38 13:31 21 18 17 15 14 12 10 9 8 8 7 6 1:16 2:11 3:03 3:55 4:48 5:40 6:32 7:24 8:16 9:09 10:01 10:53 11:45 12:37 13:30 142 107 75 59 46 36 29 21 17 12 8 4 B :10 :56 1:48 2:40 3:32 4:24 5:17 6:09 7:01 7:53 8:45 9:38 10:30 11:22 12:14 29 25 23 20 19 16 14 12 11 10 9 9 :55 1:47 2:39 3:31 4:23 5:16 6:08 7:00 7:52 8:44 9:37 10:29 11:21 12:13 134 100 69 54 41 32 25 18 14 10 6 1 C :10 :53 1:45 2:38 3:30 4:22 5:14 6:07 6:59 7:51 8:43 9:35 10:28 11:20 E L ) U 37 32 29 26 24 20 18 16 14 13 12 :52 1:44 2:37 3:29 4:21 5:13 6:06 6:58 7:50 8:42 9:34 10:27 11:19 D W :10 :53 1:45 2:38 3:30 4:22 5:14 6:07 6:59 7:51 8:43 9:35 10:28 E 48 36 14 11 S 126 93 63 28 21 7 3 D H M C 32 29 19 17 :52 1:44 2:37 3:29 4:21 5:13 6:06 6:58 7:50 8:42 10:27 2 45 40 35 25 22 16 14 9:34 . S 2 118 85 57 42 31 23 17 11 8 4 1 :10 :53 1:45 2:38 3:30 4:22 5:14 6:07 6:59 7:51 8:43 9:35 E E 1 ( V I 38 35 22 20 :52 1:44 2:37 3:29 4:21 5:13 6:06 6:58 7:50 9:34 T 55 48 42 29 25 18 8:42 W I S T 108 77 50 36 25 19 14 8 5 2 F :10 :53 1:45 2:38 3:30 4:22 5:14 6:07 6:59 7:51 8:43 F E 0 P 40 :52 1:44 2:37 3:29 4:21 5:13 6:06 6:58 4 64 56 44 26 23 7:50 8:42 E 49 34 29 R :10 :53 1:45 2:38 3:30 4:22 5:14 6:07 N 99 69 43 30 20 14 10 4 2 6:59 7:51 ) G A H W 74 64 57 51 46 39 33 29 :52 1:44 2:37 3:29 4:21 5:13 6:06 6:58 7:50 T S 6:07 M :10 :53 1:45 2:38 3:30 4:22 5:14 6:59 R 89 61 35 23 14 9 6 1 H E 2 . 2 52 W 85 73 65 58 44 38 :52 1:44 2:37 3:29 4:21 5:13 6:06 6:58 1 O ( 78 52 27 16 8 4 1 :10 :53 1:45 2:38 3:30 4:22 5:14 6:07 L I L W A S 97 83 73 65 58 :52 1:44 2:37 3:29 4:21 5:13 6:06 H F :10 :53 1:45 2:38 3:30 S 9 2 4:22 5:14 0 66 42 19 J 4 S E :52 1:44 2:37 3:29 E 109 93 81 72 4:21 5:13 V H I :10 :53 1:45 2:38 3:30 4:22 T 54 32 11 2 K D E E 90 :52 1:44 2:37 3:29 4:21 S 122 104 V I U :10 :53 1:45 2:38 3:30 T 41 21 2 L I O T T E 136 115 :52 1:44 2:37 3:29 P E 27 10 :10 :53 1:45 2:38 E R M R A 152 :52 1:44 2:37 11 N :10 :53 1:45 :52 1:44 O :10 :53 :52 Z :10 CHART 3 — REPETITIVE DIVE TIME CHART 2 — SURFACE INTERVAL TIME RED NUMBERS (TOP) ARE RESIDUAL NITROGEN TIMES (RNT) Time Ranges in hours: minutes 00 BLACK NUMBERS (BOTTOM) ARE ADJUSTED Enter Chart 2 from the top, 00 NO-STOP REPETITIVE DIVE TIMES move down to find surface interval time, ACTUAL DIVE TIME SHOULD NOT EXCEED THIS NUMBER move left to find the next repetitive group letter. COPYRIGHT 2010 BY NOAA/BPC No-Decompression Air Dive Table H-3 DIVING FORMULAS BAROMETRIC PRESSURE CONVERSIONS Units PSIG PSIA ATM ATA FSW FSWA FFW FFWA PSIGþ Add 14.7 Divide by Add 14.7, Divide by Divide by Divide by Divide by 14.7 divide 14.7 .445 .445 + 33 .432 .432 + 34 PSIAþ Minus 14.7 Minus 14.7, Divide by Minus 14.7, Divide by Minus 14.7, Divide by divide 14.7 14.7 divide .445 .445 Divide .432 .432 ATMþ Times 14.7 Times 14.7, Add 1 Times 33 Times 33 Times 34 Times 34 add 14.7 + 33 + 34 ATAþ Minus 1, Times 14.7 Minus 1 Times 33, Times 33 Times 34, Times 34, times 14.7 minus 33 minus 34 FSWþ Times Times .445, Divide by 33 Add 33, Add 33 Times 1.03 Times 1.03 .445 add 14.7 divide 33 + 34 FSWAþ Minus 33, Times .445 Minus 33, Divide by Minus 33 Minus 33, Times 1.03 times .445 Divide 33 33 times 1.03 FFWþ Times Times .432, Divide by 34 Add 34, Times .97 + 34 Add 34 .432 add 14.7 divide 34 Times .97 FFWAþ Minus 34, Times .432 Minus 34, Divide by Minus 34, Times .97 Minus 34 times .432 Divide 34 34 times .97 “T” formula: Temperature Conversions: EAD: Partial Pressure C = .556 x (ºF –32) F = (1.8 x C) + 32 1 - FO2 x (D + 33) º - 33 Total Pressure % Gas Rankine = ºF + 460 .79 (Absolute) (Decimal) Kelvin = C + 273 Volume Standards 1 Ft3 of Seawater weighs 64 Lbs. 1 Ft3 of Freshwater weighs 62.4 Lbs. BOYLE’S LAW: P1V1 = P2V2 P1 = P2xV2 V1 = P2xV2 P2 = P1xV1 V2 = P1xV1 V1 P1 V2 P2 CHARLES’ LAW: V1 = T1 V2 T2 V1 = T1xV2 V2 = V1xT2 T1 = V1xT2 T2 = T1xV2 T2 T1 V2 V1 GAY-LUSSAC’S LAW: P1 = T1 P2 T2 P1 = T1xP2 P2 = P1xT2 T1 = P1xT2 T2 = T1xP2 T2 T1 P2 P1 AIR REQUIREMENT FORMULAS 1. SURFACE AIR CONSUMPTION RATE (SAC) - (Answer in psi per min) SAC = ∆ PSI ÷ Time (mins) Depth (ATA) 2.