B08_-_Attachment_2_-_Performance_curve_-_Existing_Equipment.pdf

This document is a Performance Curve for a Spencer Turbo-Compressor from The Spencer Turbine Co. in Windsor, Connecticut. The graph details the performance specifications of a specific compressor (Machine No. 251673) with a rated capacity of 330 ICFM at 7.0 PSIG. Key technical parameters include an inlet temperature of 70°F, inlet pressure of 12.92 PSIA, and a 20 HP motor operating at 3500 RPM. The performance curve graphically represents the relationship between volume (ICFM) and input amperage to motor, as well as pressure in inches of mercury, showing how the compressor's performance characteristics change across different operational volumes from 100 to 400 ICFM. The chart also indicates an estimated surge limit, which is critical for understanding the compressor's safe operational range.