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Pressure Measurement Confusion
#1
Posted 22 October 2016 - 08:40 PM
#2
Posted 22 October 2016 - 08:42 PM
#3
Posted 22 October 2016 - 08:51 PM
It will read "vacuum". Bourdon measures "gauge" pressure, that is, relative to the surroundings.
#4
Posted 23 October 2016 - 03:23 AM
If I take this to a pressurised chamber of 3kg/cm2 gauge, what the PG connected to tyre will read?
rsk,
It should show 3kg/cm2g, provided that this value is being among PG measuring range....
#5
Posted 23 October 2016 - 09:59 AM
If I take this to a pressurised chamber of 3kg/cm2 gauge, what the PG connected to tyre will read?
rsk,
It should show 3kg/cm2g, provided that this value is being among PG measuring range....
#6
Posted 24 October 2016 - 10:28 AM
tyre is getting pressurised to 5 kg/cm2, due to internal pressure of 2 kg/cm2 and external chamber's pressure of 3kg /cm2. But same 3kg /cm2 is also acting outside of PG bourbon tube. I think it should read 2kg/cm2 only as earlier. Please clarify.
#7
Posted 24 October 2016 - 12:00 PM
Sir
tyre is getting pressurised to 5 kg/cm2, due to internal pressure of 2 kg/cm2 and external chamber's pressure of 3kg /cm2. But same 3kg /cm2 is also acting outside of PG bourbon tube. I think it should read 2kg/cm2 only as earlier. Please clarify.
rsk,
Your descriptions are confusing...a simple sketch might help to understand the actual matter...
Anyway, appears the PG would show vacuum equal to 1kg/cm2 ...
#8
Posted 24 October 2016 - 04:02 PM
Simplifying assumption: tire volume is constant. Convert the pressures to absolute pressure to make computation easier. Outside the pressurized chamber, the tire has internal pressure of 3 kg/cm2(abs). The external pressure is 1 kg/cm2(abs). Pressure gauge measures the difference and shows internal pressure of 2 kg/cm(g). Then move the tire into the pressurized chamber. The tire has internal pressure of 3 kg/cm2(abs). The external pressure is 4 kg/cm2(abs). The pressure gauge measures the difference and shows -1 kg/cm2(g).
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