Same-reference arithmetic only
Compressed-Air Flow Aggregation
Sum explicit end-use free-air flows on one declared reference basis. The duty-weighted value is a time-average estimate; the all-listed sum is a simple coincidence envelope. Neither is a compressor-sizing verdict.
Flow arithmetic
Two different sums
The first is an arithmetic time average if each duty fraction is valid over the same interval. It loses event timing and cannot predict a peak. The second assumes every listed source flow occurs together; it is not a statistical diversity calculation. Purge, drains, artificial demand and other losses must be explicit rows or otherwise measured.
FAD and reference conditions
ISO 1217:2009 with Amendment 1:2016 is the published displacement-compressor acceptance-test standard for volume flow and power, confirmed in 2021 and now under revision. A compressor’s stated performance must be compared on its applicable test/reference basis; this page does not reproduce the standard or certify FAD.
The CAGI Compressed Air System Design guide stresses that end-use and compressor capacity are commonly stated as free-air volume and that demand dynamics, storage and capacity control are central to design. The US DOE compressed-air evaluation protocol develops load profiles from measurements and quantifies leakage separately.
Not compressor sizing: verify measured time-resolved demand/peaks, required pressure at each point after losses, air quality/dryers and purge, receiver/header storage, compressor control and turndown, unloaded energy, duty rating, ambient/altitude, redundancy, future change, leakage program and manufacturer performance at the same reference conditions.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
