[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PSUBS-MAILIST] Barometers



Psubbers:
Save yourself a lot of packaging headaches: Go to a recreational aircraft store (usually around airports) and buy a skydivers altimeter - rugged,nicely housed, and 'cheap like borscht'! Covers the range you need and in readable increments.
As Vance and Cartsten and others have said - if the pressure rises after 'hatch-latched', thats bad news and you need to find out why.
Don't panic when the pressure drops, tho' . . .it's usually just temperature change as you descend into the gloom !
Phil  
----- Original Message -----
Sent: Wednesday, December 29, 2010 9:34 AM
Subject: Re: [PSUBS-MAILIST] Barometers

Barometers are useful for your life support. An inch of mercury equals about 1/2 psi. When the pressure is up an inch, run the scrubber until your pressure is down an inch. You maintain a maximum differential of 1 psi and it works a treat, and it's cheap.

If you have a gas leak in the boat, my friends, you need to be on the trailer or in the shop fixing it. This is no question here. No gas leaks. That is why buying and using the best valves, Swagelok connectors or equivalent and SS tubing is so important. Once set, it holds. That makes it worth the price. Leave the air conditioning connectors to the air conditioning folks.

If something untoward happens, get out of the water and go after the leak with Snoop. Also, carry a Snoop squeeze bottle in your tool kit. Any questions, start checking on the spot. All in all, unless you've got big volume like the Euronaut, get back to the surface.

Vance



-----Original Message-----
From: Alan James <alanjames@xtra.co.nz>
To: personal_submersibles <personal_submersibles@psubs.org>
Sent: Wed, Dec 29, 2010 6:40 am
Subject: Re: [PSUBS-MAILIST] Barometers

Carsten,
was that your experience with SGT Peppers?
I am also making a small sub & Having a small internal volume 
it would be more likely to have larger variations in pressure.
Alan

----- Original Message ----- 
From: <MerlinSub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Thursday, December 30, 2010 5:17 AM
Subject: Re: [PSUBS-MAILIST] Barometers


A standard barometer is just fine. 
Read it during closing the hatch - and adjust the "stay" arrow to the number. 
Means bring both indicators to the same figure.
If during the dive the barometer indicator increase this means you have a gas 
leak in your sub..
To much oxygen flow or a leak in the compress air system. 

vbr carsten

"Alan James" <alanjames@xtra.co.nz> schrieb:
> Hi,
> I've just started looking at barometers.
> The standard range for a barometer seems to be round 960 - 1060 milli bars.
> This is a range of 1.47 psi. This seems small considering pressure changes
> due to cold or hot conditions & fluctuations due to O2 consumption & response 
times of the life support
> system to adjust for this. Can anyone comment on wether a standard barometer 
stays within it's scale, 
> or wether I'd be better off buying something electronic with a wider range.
> Regards Alan
> 




************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 53
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************





************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 53
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************