WARPIG Tech Talk - Air - Re: air transport


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WARPIG Tech Talk - Air
Re: air transport

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Posted by WARPIG Tech on June 29, 2002 at 09:27:11:

In Reply to: Re: air transport posted by LanceR on June 28, 2002 at 18:05:59:

: Are you driving?
: Check the guage periodically, and vent some gas if the pressure gets high. Don't leave the tank in a hot car.

The altitude pressure difference does not matter at all, and will not be reason to vent any pressure.

Air pressure at sea level (barring minor changes due to weather) is 14.7 psi. Air pressure at 18,000 feet (much higher than he will be going) is 7.35 psi.

Reducing the outside pressure has the same effect as increasing the inside pressure (ie - it's relative pressure). Now, when we're talking about a 3,000 psi or 4,500 psi tank, you're not going to have to watch it and vent it for a change of 3 or 4 psi to avoid overpressurizing it. You won't even be able to see a pressure change that small on the gauge unless you've got an Angel Air.

More important is making sure that the DOT exemption is current - that hydrotesting is up to date - otherwise it is a crime to transport it on highways. Also, it needs to be secured and protected in the vehicle.

See you on the field,
-Bill Mills

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Subject:Message:
: : Are you driving? : : Check the guage periodically, and vent some gas if the pressure gets high. Don't leave the tank in a hot car. : The altitude pressure difference does not matter at all, and will not be reason to vent any pressure. : Air pressure at sea level (barring minor changes due to weather) is 14.7 psi. Air pressure at 18,000 feet (much higher than he will be going) is 7.35 psi. : Reducing the outside pressure has the same effect as increasing the inside pressure (ie - it's relative pressure). Now, when we're talking about a 3,000 psi or 4,500 psi tank, you're not going to have to watch it and vent it for a change of 3 or 4 psi to avoid overpressurizing it. You won't even be able to see a pressure change that small on the gauge unless you've got an Angel Air. : More important is making sure that the DOT exemption is current - that hydrotesting is up to date - otherwise it is a crime to transport it on highways. Also, it needs to be secured and protected in the vehicle. : See you on the field, : -Bill Mills

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