Enter three points of the pump curve and the system curve to see the operating point, the effect of pumps in parallel or series, and how much a variable frequency drive saves versus a throttling valve.
Pre-sizing and estimating tool: results do not replace design, calculations or reports signed by a licensed professional, nor verification against the applicable codes and standards.
Pump curve in the chosen arrangement, system curve, pump curve at reduced speed for the required flow, and the operating points.
Electric power with throttling and with a drive, for flows from 40% to 100% of the operating point.
Cash flow of the improvement: investment in year 0 and annual savings escalated at the rate entered, discounted at the MARR.
The report gathers this page's inputs, results, equations, assumptions and references, with fields for project, engineer and revision. In the print dialog, choose Save as PDF.
It is where the pump curve crosses the system curve. The calculator fits a parabola through the three catalog points and solves the intersection with H = Hs + K·Q².
No. They double flow at the same head, but the system needs more head at higher flow. The real gain depends on the system curve slope: in friction-dominated systems it is small.
When flow stays below rated much of the time and the static share of head is low. With high static head, speed cannot drop much and savings shrink.
Important notice: Indus Metrics tools produce estimates and pre-sizing results from the data you enter and from published engineering methods. They do not replace design, calculations or reports signed by a licensed professional engineer (PE), nor verification against the applicable codes, standards and regulations, such as OSHA rules and the ASME codes. Material and fuel properties vary: check manufacturer data or your own process analyses before deciding. By using this site you agree to the Terms of Use.
© 2026 Indus Metrics. Found an error? Write to contato@seudominio.com.