A compressor is operating at an inlet pressure of 14.7 (atmospheric pressure at the time of measurement) and a compressor discharge pressure of 123 psig. Calculate the absolute pressure ratio across the compressor.
• Difference between psig (gauge pressure) and psia (absolute pressure) • How to convert gauge pressure to absolute pressure using local atmospheric pressure • Formula for pressure ratio across a compressor
• What must you do to the 123 psig discharge pressure before comparing it to the 14.7 psi atmospheric pressure? • Once both inlet and discharge pressures are on the same absolute scale, how do you form the ratio? • Are you using the correct inlet pressure value in absolute terms, or accidentally mixing gauge and absolute units?
• Be sure the discharge pressure is converted from psig to psia before forming the ratio • Confirm the inlet pressure is already absolute (since it is given as atmospheric) and not gauge • After computing the ratio, compare your numerical result carefully to the closest listed choice without rounding too early
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