<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Would there be any problem locating that valve below the water line, I don't want have any available ports up high.</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] Acceptable cabin pressure swing<BR>Date: Sat, 27 Feb 2016 12:18:40 -0600<BR><BR></DIV><DIV>Yes, I thought I gave the number for the stainless steel version. Yes ss is the way to go.</DIV><DIV><BR></DIV><DIV>Thanks for catching this.<BR><BR><BR><DIV>Cliff Redus</DIV></DIV><DIV><BR>On Feb 27, 2016, at 9:40 AM, Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV>Cliff,</DIV><DIV>that item is carbon steel. I think Brian will be diving in sea water.</DIV><DIV>Cheers Alan<BR><BR>Sent from my iPad</DIV><DIV><BR>On 28/02/2016, at 4:07 am, Cliff Redus via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV>Brian, see McMaster Carr part number 4620K41. This has a 1 psi cracking pressure, not 0.5 psi that I mentioned earlier.<DIV><BR></DIV><DIV>Cliff<BR><BR>On Thursday, February 25, 2016, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BLOCKQUOTE style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;"><DIV style="font-family: Arial,sans-serif; font-size: 10pt;"><DIV>Cliff, Where did you find that 1/2 psi relief valve?</DIV><DIV> </DIV><DIV>Brian Cox<BR><BR>--- <A>personal_submersibles@psubs.org</A> wrote:<BR><BR>From: Cliff Redus via Personal_Submersibles <<A>personal_submersibles@psubs.org</A>><BR>To: Personal Submersibles General Discussion <<A>personal_submersibles@psubs.org</A>><BR>Subject: Re: [PSUBS-MAILIST] Acceptable cabin pressure swing<BR>Date: Thu, 25 Feb 2016 19:05:00 -0600<BR><BR></DIV><DIV dir="ltr"><DIV>Jon for my boat, I have a pressure relief valve with a 1/2 psi cracking pressure to vent pressure while on the surface. I have a high cabin pressure alarm that triggers at 20 psia (5.3 psig) and a cabin lower pressure alarm set at 12 psia (-2.7 psig). In the PLC I also record and display the cabin pressure at the time the hatch is closed and log all alarm states every second. </DIV><DIV><BR></DIV><DIV>I have never had either a high or low cabin pressure alarm while diving. I have had elevated cabin pressure caused by accidently having the backup manual O2 value open and a leak in an air fitting on anther occasion.</DIV><DIV><BR></DIV><DIV>Cliff</DIV></DIV><DIV><BR><DIV>On Wed, Feb 24, 2016 at 1:12 PM, Jon Wallace via Personal_Submersibles <SPAN dir="ltr"><<A>personal_submersibles@psubs.org</A>></SPAN> wrote:<BR><BLOCKQUOTE style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;"><BR>
I think this is somewhat subjective but what is general consensus on maximum cabin pressure swing (higher/lower) relative to hatch closing at the start of a dive before setting off alarms? My thought is that an alarm should sound well before any point of emergency. I'm considering sounding a warning at 2psi +/- and an alarm at 4psi +/- but I'm not sure if this is too strict.<BR>
<BR>
Jon<BR>
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