Talk:Maximum operating depth

Question

"This makes one to ask the question: So what is the average maximum depth a human can/is allowed to swim without body damage?"

Assuming you mean free diving (diving without SCUBA gear, using a single lungfull of air from the surface), check out http://en.wikipedia.org/wiki/Free-diving Ryan (talk) 11:07, 21 September 2010 (UTC)

If you mean on scuba, then see Deep diving, particularly the section Ultra-deep diving. There's also an article on Atmospheric diving suit that may be of interest. --RexxS (talk) 18:51, 21 September 2010 (UTC)

Tables

I don't think that those tables are helpful. Axl ¤ [Talk] 08:08, 24 February 2009 (UTC)

I disagree; they are useful, and I tried finding this information for a few minutes on Google without much luck (for meter tables; plenty of foot tables, or tables for Air, EAN32, EAN36 only). I've got full tables in my dive books and software, but nothing googleable. I came here based on google.

As they are, the tables are kind of useless due to going up in steps of 3; you really want to hit EAN32 and EAN36 (by a wide margin, the most widespread mixes; EAN32 is basically standard nitrox for most divers), so it should be a step of 1, 2, or 4. I'll probably calculate the tables and update it myself, although I want to double-check everything since incorrect PO2 is potentially lethal. Ryan (talk) 11:03, 21 September 2010 (UTC)

Here's an overprecise table giving MOD in metres against FO2 in 1% increments from 21% to 40%

Maximum operating depth in metres for fraction O₂ in 1% increments for max ppO₂=1.4 bar

FO2 (%)	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40
MOD (m)	56.7	53.6	50.9	48.3	46.0	43.8	41.9	40.0	38.3	36.7	35.2	33.8	32.4	31.2	30.0	28.9	27.8	26.8	25.9	25.0

The values are close enough for linear interpolation. Hope that helps. --RexxS (talk) 18:34, 21 September 2010 (UTC)

Incorrect/inadequate reference for the NOAA recommendation

The reference (Lang, M.A. (2001). DAN Nitrox Workshop Proceedings. Durham, NC: Divers Alert Network. p. 197. Retrieved 2008-06-24) given for the statement, "The maximum single exposure limits recommended in the NOAA Diving Manual are 45 minutes at 1.6 bar, 120 minutes at 1.5 bar, 150 minutes at 1.4 bar, 180 minutes at 1.3 bar and 210 minutes at 1.2 bar" seems to be inadequate. The specific recommendation was not found on the specified page or in the entire document for the matter! — Preceding unsigned comment added by Ktp.kti (talk • contribs) 07:23, 14 November 2012 (UTC)

The NOAA single exposure limits are on page 52 of DAN Nitrox Workshop Proceedings. I've amended the page parameter to indicate the correct page. --RexxS (talk) 15:02, 21 November 2012 (UTC)

No 32%??

Really? It's only the most widely used gas mix after air... — Preceding unsigned comment added by 76.91.189.52 (talk) 07:50, 15 October 2016 (UTC)

Your point is that the tables should include 32%? What is your suggested solution? At present the table increments by 3%. A 2% increment would make the tables 50% wider. One can interpolate to get intermediate values, or calculate any MOD using the formulae. Wikipedia is not a training or operating manual, and should not be used as such. Do you consider that 32% MOD should be specified for any reason other than that 32% is the most commonly used mix? • • • Peter (Southwood) ^(talk): 08:13, 15 October 2016 (UTC)

To be honest, if I were designing those tables, I'd use 4% increments to 40% and 10% increments after that (which would be kinder to mobile users as well). I'd also round the depths in metres to whole numbers. In reality, the accuracy of neither an oxygen analyser nor a depth gauge are good enough to warrant that degree of precision in the displayed depths. --RexxS (talk) 12:19, 15 October 2016 (UTC)

Maximum Operating Depth (MOD) in feet of sea water for pO2 1.2 to 1.6

MOD (fsw)		% oxygen
		4	8	12	16	20	24	28	32	36	40	50	60	70	80	90	100
Maximum pO2 (bar)	1.6	1287	627	407	297	231	187	156	132	114	99	73	55	42	33	26	20
	1.5	1205	586	380	276	215	173	144	122	105	91	66	50	38	29	22	17
	1.4	1122	545	352	256	198	160	132	111	95	83	59	44	33	25	18	13
	1.3	1040	503	325	235	182	146	120	101	86	74	53	39	28	21	15	10
	1.2	957	462	297	215	165	132	108	91	77	66	46	33	24	17	11	7

Rounded to nearest fsw

Maximum Operating Depth (MOD) in metres of sea water for pO2 1.2 to 1.6

MOD (msw)		% oxygen
		4	8	12	16	20	24	28	32	36	40	50	60	70	80	90	100
Maximum pO2 (bar)	1.6	390	190	123	90	70	57	47	40	34	30	22	17	13	10	8	6
	1.5	365	178	115	84	65	53	44	37	32	28	20	15	11	9	7	5
	1.4	340	165	107	78	60	48	40	34	29	25	18	13	10	8	6	4
	1.3	315	153	98	71	55	44	36	31	26	23	16	12	9	6	4	3
	1.2	290	140	90	65	50	40	33	28	23	20	14	10	7	5	3	2

Rounded to nearest msw

Perhaps something like that? --RexxS (talk) 12:58, 15 October 2016 (UTC)

Looks fine to me. Is there any advantage to the fancy table format (double frame borders)? I find them slightly distracting. • • • Peter (Southwood) ^(talk): 19:45, 15 October 2016 (UTC)

@Peter: There's no advantage at all. In fact, using class="wikitable" is preferable for consistency across the project - it also automatically centres the headings, so markup is even simpler. I merely left as much of the original formatting in place for expediency. Below are the tables revised to use "wikitable" for comparison:

Maximum Operating Depth (MOD) in feet of sea water for pO2 1.2 to 1.6

MOD (fsw)		% oxygen
		4	8	12	16	20	24	28	32	36	40	50	60	70	80	90	100
Maximum pO2 (bar)	1.6	1287	627	407	297	231	187	156	132	114	99	73	55	42	33	26	20
	1.5	1205	586	380	276	215	173	144	122	105	91	66	50	38	29	22	17
	1.4	1122	545	352	256	198	160	132	111	95	83	59	44	33	25	18	13
	1.3	1040	503	325	235	182	146	120	101	86	74	53	39	28	21	15	10
	1.2	957	462	297	215	165	132	108	91	77	66	46	33	24	17	11	7

Rounded to nearest fsw

Maximum Operating Depth (MOD) in metres of sea water for pO2 1.2 to 1.6

MOD (msw)		% oxygen
		4	8	12	16	20	24	28	32	36	40	50	60	70	80	90	100
Maximum pO2 (bar)	1.6	390	190	123	90	70	57	47	40	34	30	22	17	13	10	8	6
	1.5	365	178	115	84	65	53	44	37	32	28	20	15	11	9	7	5
	1.4	340	165	107	78	60	48	40	34	29	25	18	13	10	8	6	4
	1.3	315	153	98	71	55	44	36	31	26	23	16	12	9	6	4	3
	1.2	290	140	90	65	50	40	33	28	23	20	14	10	7	5	3	2

Rounded to nearest msw

I'd be more than happy to see that style used instead. --RexxS (talk) 20:33, 15 October 2016 (UTC)

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