[PSUBS-MAILIST] Hp valves

Fri Jan 22 23:45:22 EST 2016

Alec, What kind of gauges are you using.

Pete
--------------------------------------------
On Fri, 1/22/16, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Hp valves
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Date: Friday, January 22, 2016, 10:15 PM

 The
 original Kittredge arrangement is two SCUBA tanks inside the
 hull, with ball valves allowing you to switch between them.
 On Snoopy I moved the tanks outside, with independent HP
 lines into the hull. They had separate hull stops, and from
 those were combined in a manifold. The HP lines had check
 valves so that air could only enter the manifold but not
 back up, so that if for whatever reason (say a blown tank
 valve O ring) you lost pressure in one of the tanks, its
 check valve would prevent the manifold and the second tank
 from emptying. In Shackleton I have reproduced the same
 exact arrangement except everything but the gauges and BIBS
 has moved outside. 
 Best,
 Alec 
 On Fri, Jan 22, 2016 at
 9:09 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 I don't know
 Brian, maybe Alec could answer
 that.G. L. have that golden rule
 that I quoted,Section 2
 A.1..."Wherever expedient & feasible, submersibles
 are to be constructed in such a waythat failure of any single component cannot
 give rise to a dangerous situation."   That seems a good rule of thumb to
 design from.Cheers
 Alan

        From: Brian Cox via
 Personal_Submersibles <personal_submersibles at psubs.org>
  To: Personal
 Submersibles General Discussion <personal_submersibles at psubs.org>

  Sent: Saturday, January
 23, 2016 2:41 PM
  Subject: Re:
 [PSUBS-MAILIST] Hp valves

 Alan,  Are the Kittridge
 subs all redundant in that respect?  
  Brian

 --- personal_submersibles at psubs.org
 wrote:

 From: Alan James via
 Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion
 <personal_submersibles at psubs.org>
 Subject: Re: [PSUBS-MAILIST] Hp valves
 Date: Fri, 22 Jan 2016 22:57:07 +0000 (UTC)

 Brian,just
 looked up the G.L. rules Section 9 piping systems, pumps
 & compressors.It says 1.2 Pipes
 which are led thriught the pressure hull are to be fitted
 with 2 shut off valves.One of which
 is to be fitted immediately at the hull
 wall.    In 3.3 it says " The
 compressed air supply is to be carried in at least 2
 separate banks of receivers with
 thesame total
 volume."Alan

 From: Alan
 James via Personal_Submersibles <personal_submersibles at psubs.org>
  To: Personal
 Submersibles General Discussion <personal_submersibles at psubs.org>

  Sent: Saturday, January
 23, 2016 11:31 AM
  Subject: Re:
 [PSUBS-MAILIST] Hp valves

 Brian,can you split the HP air in to two lines so
 you have two HP lines coming in.That way if one line failed you would have a
 back up. Also if a HP line rupturedor connection broke, then you would only
 have half the pressure in the hull.Inside my ambient I never see HP air, but I
 have two separate air systems& valves to use both simultaneously or
 separately.I am not sure
 what other psubbers do. This is bound to be covered in the
 Busby book.   I have
 heard reference to  subs being stuck in the mud through
 sitting on the bottom&
 coming up carrying a load of extra weight in the form of
 mud. I noticed in Carsten'svideo that he sat on the bottom &
 pivoted. I am guessing to let the divers out,
 butsounds like a good
 practice on a muddy sea bed.Alan

 From: Brian
 Cox via Personal_Submersibles <personal_submersibles at psubs.org>
  To: Personal
 Submersibles General Discussion <personal_submersibles at psubs.org>

  Sent: Saturday, January
 23, 2016 10:23 AM
  Subject: Re:
 [PSUBS-MAILIST] Hp valves

 Alan,   The air would
 most likely vent thru the hatch and then I'd be at
 whatever pressure the ambient water pressure would be .  If
 there was no air to surface I guess I'd have to
 bail.   I will have an additional tank outside the hull
 for filling the ballast however.  That will be for raising
 and lowering the sub with scuba while out side the sub.  I
 was thinking it would be kind of neat to set it on the
 bottom in about 30' water. That way I wouldn't have
 to anchor it ! Brian

 --- personal_submersibles at psubs.org
 wrote:

 From: Alan James via
 Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion
 <personal_submersibles at psubs.org>
 Subject: Re: [PSUBS-MAILIST] Hp valves
 Date: Fri, 22 Jan 2016 17:51:26 +0000 (UTC)

 Hi
 Brian,I questioned G.L. on a number
 of items in thier rules for submarines& there are some grey areas that you
 would have to argue the point overwith an inspector.One general rule is that no one failure can
 cause a major event.If the
 pipe failed at that elbow & you couldn't stop the
 flow of HP air,what sort
 of pressure could you be left with in the
 hull?Would you be able to
 blow the ballast tanks if you lost your airfrom that failure or do you have a redundant
 air supply?Cheers
 Alan

 From: Brian
 Cox via Personal_Submersibles <personal_submersibles at psubs.org>
  To: Personal
 Submersibles General Discussion <personal_submersibles at psubs.org>

  Sent: Saturday, January
 23, 2016 6:34 AM
  Subject: Re:
 [PSUBS-MAILIST] Hp valves

 ABS says " as close as
 possible"  I guess I'm ok with a short nipple
 coming off a elbow. Brian

 --- personal_submersibles at psubs.org
 wrote:

 From: Brian Cox via
 Personal_Submersibles <personal_submersibles at psubs.org>
 To: "PSubs " <personal_submersibles at psubs.org>
 Subject: [PSUBS-MAILIST] Hp valves
 Date: Wed, 20 Jan 2016 08:34:43 -0800

 Is there any distinction as
 to how close a HP shut off valve or check valve has to be
 to the hull penetration so as to meet ABS requirements?  
 Can there be a short nipple between an elbow and the valve
 for instance? Brian
 Cox
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