Hydraulic power vs cavitation margin
The module ties velocity head, elevation, suction losses, and vapor pressure to estimate cavitation margin. Use manufacturer NPSHR curves for procurement decisions.
Model assumptions
- Single-line incompressible model; temperature-dependent vapor pressure must be entered consistently with fluid tables.
- NPSHa uses your stated margins and velocity head treatment as implemented in the tool; verify against internal company standards.
- Pump curves, control valve throttling, and transient events are not modeled.
- Instrumentation tap locations and velocity profile distortion are neglected.
References & further reading
- Karassik et al., Pump Handbook — NPSH definitions and field practice.
- ANSI/HI standards for rotodynamic pump tests where applicable to your workflow.
Shareable URL
When the toolbar exposes “Copy shareable link”, inputs can be encoded in the URL so colleagues can reopen the same case. All computations run locally in your browser; this tool may not expose share links yet.
Frequently asked questions
- Why does NPSHa change when I tweak suction line losses?
- Because NPSHa is built from suction-side energy balance including hfs.
- Is NPSHr from the vendor required?
- For final selection yes; this tool accepts a typed NPSHr placeholder for screening.
- Are calculations cloud-based?
- No. They run in your browser.
Extended copy on this page (headings, assumptions, references, FAQs) may be drafted or localized with AI assistance; engineering judgment and governing codes still apply. Numerical models run locally in your browser as implemented. For contract-critical work, cite primary standards and qualified review.