External pressure.

hanhdvk43 · **Joined:** Wed Apr 01, 2009 7:28 am **Posts:** 7

Goodmorning

Mods, please help me, internal pressure of tank = -1.0bar, that mean external pressure = +1.0bar, it's correct? if not correct, how to calculate?

thank you
Best regards.

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 603

hanhdvk43 wrote:

Goodmorning

Mods, please help me, internal pressure of tank = -1.0bar, that mean external pressure = +1.0bar, it's correct? if not correct, how to calculate?

thank you
Best regards.

Gage Pressure is the Absolute pressure minus the athmospheric pressure. Being the pressure gage an instrument which measures the differential pressure between ambient and the vessels pressure.
Pg = Pa-Athm.
Athmosferic pressure is 1 Bar
Therefore
Pg = Pa-1
if in the vessel there is vacuum i.e. Pa = 0
Pg = 0 - 1
Pg = -1
Mind that Code always refers to Pg

Frohnert · **Posted:** Wed Dec 30, 2009 3:50 pm

hanhdvk43 wrote:

Goodmorning

Mods, please help me, internal pressure of tank = -1.0bar, that mean external pressure = +1.0bar, it's correct? if not correct, how to calculate?

thank you
Best regards.

correct

hanhdvk43 · **Joined:** Wed Apr 01, 2009 7:28 am **Posts:** 7

Gonzaga wrote:

hanhdvk43 wrote:

Goodmorning

Mods, please help me, internal pressure of tank = -1.0bar, that mean external pressure = +1.0bar, it's correct? if not correct, how to calculate?

thank you
Best regards.

Gage Pressure is the Absolute pressure minus the athmospheric pressure. Being the pressure gage an instrument which measures the differential pressure between ambient and the vessels pressure.
Pg = Pa-Athm.
Athmosferic pressure is 1 Bar
Therefore
Pg = Pa-1
if in the vessel there is vacuum i.e. Pa = 0
Pg = 0 - 1
Pg = -1
Mind that Code always refers to Pg

Thank you very much.

External pressure.

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