Compressor outlet absolute pressure: terminology What is the term used for the absolute pressure of air measured at the outlet (delivery side) of a compressor?

Introduction / Context:
Clear terminology is essential when reading compressor specifications and performance curves. The pressure measured at the outlet nozzle or delivery header of a compressor is a standard data point used to define pressure ratio and duty.

Given Data / Assumptions:

• We refer to absolute pressure at the outlet, not gauge pressure unless stated.
• Steady delivery into a receiver or process line.

Concept / Approach:
The absolute pressure at the compressor outlet is called the discharge pressure. It is paired with the inlet (suction) pressure to define the compression ratio: r = p_out / p_in. The term “back pressure” is used in different contexts (e.g., exhaust systems), and “critical pressure” relates to choked flow theory, not compressor outlet nomenclature.

Step-by-Step Solution:

Verification / Alternative check:
Compressor datasheets list suction pressure, discharge pressure, and pressure ratio; these terms are universally used in industry standards.

Why Other Options Are Wrong:

Back pressure: generic term for resistance pressure downstream, not the designated outlet absolute pressure term.Critical pressure: relates to nozzle choking, not outlet measurement naming.Atmospheric or stagnation pressures are not the specific descriptor for outlet line pressure in this context.

Common Pitfalls:
Confusing gauge and absolute units; always check whether the specification uses bar(a) or bar(g).

Final Answer:

Discharge pressure