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Q: What term is more commonly use in refrigeration psia or psig?

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psia to psig psig - 15 15 - 15= 0 psig

psia=psig+atmospheric pressure where, atmospheric pressure = 14.7psi therefore psig=psia-atmospheric pressure psig=100-14.7 psig=85.3psig

70 psig

55 psig +15=70

The Compound Gauge measures above and below atmospheric pressure (in psig and inches of mercury).

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psia to psig psig - 15 15 - 15= 0 psig

psia=psig+atmospheric pressure where, atmospheric pressure = 14.7psi therefore psig=psia-atmospheric pressure psig=100-14.7 psig=85.3psig

70 psig

PSIA is Pounds per Square Inch Absolute, as opposed to PSIG which is PSI Gauge. PSIA is absolute pressure. For example, normal atmospheric pressure is about 14.7 PSIA, so a PSIA device connected to atmosphere would read 14.7. PSIG is relative pressure, so if system pressure is 15.7 PSIA, and atmospheric pressure is 14.7 PSIA, then PSIG would be 1.0

Add air pressure.

approximately 14.5PSIA.

Convert 70 psig to kPa (kilopascal) 1 psia = 6.89 kPa 70 psig + 15 = 85 psia 85 X 6.89 = 583.6 85 X 6.89= 585.65 is the correct math

add atmosperic pressure to gage pressure to convert to psia one atm standard = 14.7 psi

psia is absolute pressure which is atmospheric pressure relative to a vacuum of zero pressure and equals 14.7 psi psig is Gage pressure which is pressure relative to absolute pressure and equals the amount above 14.7 psi

psia IS the abbreviation. It stands for Pounds per Square Inch Absolute. When determining a pressure, you are typically measuring it with something that is subjected to atmospheric pressure (1atm~14psia) just like you and I. So say you inflate your tires to 35 psi and check it with a tire gauge. That reading is the GAUGE pressure, or psig. Typically, gauge pressures will not use the G at the end because people tend to be good enough at noticing that there's a difference between "psi" and "psia" and start to ask questions. The ABSOLUTE pressure is the gauge pressure plus the atmospheric pressure. Expressed in equation form, this looks like: psia = psig + atm -or- psig = psia - atm In the case of a vacuum, where there is less than atmospheric pressure, an absolute gauge will read positive values while a typical gauge will read negative values. The equation still holds true. Example: Absolute pressure = 4 psia 1 atm ~ 14 psia What is the gauge pressure? -10 psig 4 psia - 14 psia = -10 psig

The difference between Absolute Presure and Gauge Pressure is 14.7psi. So zero gauge pressure (0psig) = 14.7 psia. 600 psig = 614.7 psia. Calibrate the tranmitter so 4mA is obtained at 14.7 psig and 20mA is obtained at 614.7psig. The span will be 600 psi in both cases.

The perfect answer requires understanding of the density of the water at different temperatures and pressures at all levels of depth. NOTE: The distinction between PSIG and PSIA is that PSIG is pressure as compared to local (atmospheric) pressure which becomes negative for a vaccum (pressure less than the local pressure). O PSIA is a perfect vacuum and normal atmospheric pressure is ~14.7 PSIA (0 PSIG when referenced to atmospheric local pressure) Without getting too "deep" into the perfect answer, using an approximation thumbrule of 1/2 psi increase per 1 foot of water depth, the answer is approximately 328 PSIG or ~ 343 PSIA.

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