[PSUBS-MAILIST] Vacuum vacuum

Tue Apr 30 05:03:04 EDT 2019

Why you not use just the Dieselengine for that purpose..  :-)

-----Original-Nachricht-----
Betreff: Re: [PSUBS-MAILIST] Vacuum vacuum
Datum: 2019-04-30T04:24:45+0200
Von: "Brian Cox via Personal_Submersibles" 
<personal_submersibles at psubs.org>
An: "Personal Submersibles General Discussion" 
<personal_submersibles at psubs.org>

Alan,   All you would need to do is open a valve.   But I was mainly just 
doing it to test that I have everything back together that I took apart.  
It's a hell of a lot easier that hooking up a vacuum pump.  The other thing 
is that if your hatch dogs are not compressing your hatch down very hard ( 
like mine ) then potentially if you were lingering at the surface right at 
the hatch level you could get some leakage passed the hatch o ring.  

Brian

--- personal_submersibles at psubs.org wrote:

From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion 
<personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Vacuum vacuum
Date: Tue, 30 Apr 2019 14:14:46 +1200

Brian,
I am wondering if it is worth doing!
None of the Psubs do it that I know of ( correct me if I'm wrong).
If you pulled a vacuum & the sub stayed at that pressure then you
would need to pressurise the hull to get out! But good test to see 
that the hatch is sealing ok.
Alan

On 30/04/2019, at 11:03 AM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
wrote:

    Hi All,
                       Tried the Vacuum cleaner , shop vac , method of
    pulling a vacuum on the sub today.   Works really great!   I pulled
    about neg 2 psi and it pulled the hatch down instantly and is holding
    nicely.  The large volume of air vacuum works a lot better than using a
    vacuum pump since it tends to pull surface area of the hatch all at
    once , where as when using the vacuum pump I remember having to sit on
    the hatch to make it grab.   I'm trying to remember Phil Nuytten's
    procedure after the vacuum is pulled, was it to bring the cabin
    pressure gauge dial back to zero by turning the dial indicator?  And
    with his bellows add system there was another adjustment I believe.  

    Brian

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