Re: [PSUBS-MAILIST] Vacum test

[MerlinSub@t-online.de]

A predive vacum test is not very usefull to check the boat design or construction mistakes.

If you like to do this you need a pressure chamber were the boat fits in 
and pressure it to 1,25 of the max operation depths. 

A light vaccum test (under pressure test) its usefull to remember you that you have forgotten a vale, an o-ring 
or an open plug were you last week in the shop remove an old antenna cable or so. 
Or here in the North Sea that a vales was freeze broken over night. 
Or for a very expierence old submariner that he has forgotten that the hatch is still open.. 
Is just part of the predive procedure like check o2 storage or battery status. 

It cost nothing, is no work and need only 1-2 minutes time. You will realize big holes in seconds and small once in minutes. 
Important ist that the barometer stands like a rock for 1-2 minutes. 

Peppers has an internal volume of 400 Liters and my lungs has about 4 Liter = 1% 
To reduce the internal pressure from 1000 Milibar to 950 Milibar =5% needs 5 time breathing. 

On a K-Boat maybe a little more. 

vbr Carsten 


<ShellyDalg@aol.com> schrieb:
> A vacuum test sounds like a way to check for a pin hole leak, but seems  
> like a lot of work. A pin hole at 250 feet will squirt some water maybe, or 
> more  likely drip some, but if you welded the fittings, hull, tower, etc. your 
> self  you should know if it's screwed up. I'm not sure a shop vac test for 
> leaks is  all that useful. 
> Deep water testing un-manned via cable and/or remote control is still going 
>  to be required, and it's quite possible a pin hole leaking at depth 
> wouldn't  leak at 2 feet or with a shop vac. Nice little exercise though if you've 
> got  time on your hands.
> Brent: are you hot dipping the entire hull ? I love that idea, but it  
> sounds expensive. Got any more info on this? Frank D.
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