Fluids, pumps and piping
Results do not select a final pipe class, pump, valve, pressure rating, material, NPSH margin or mechanical-integrity requirement. Multiphase flow, transients, cavitation, non-Newtonian behavior, fittings, control behavior and manufacturer curves may require methods beyond a simplified calculator.
Heat transfer, thermodynamics, HVAC and refrigeration
Results depend on property data, boundary conditions, fouling, phase behavior, equipment geometry, control strategy and operating envelope. Refrigerant pressure-temperature data and compliance values must come from an appropriate confirmed property source or governing requirement.
Electrical power and protection
Voltage-drop, conductor, fault, protection and power calculations are not final electrical designs. Applicable wiring rules, protective-device coordination, fault duties, installation methods, ambient conditions, derating, earthing and local jurisdiction requirements must be checked separately.
Structural, civil and geotechnical
Structural and soil calculations are screening aids only. Loads, combinations, stability, connections, material factors, serviceability, durability, seismic/wind actions, ground investigation and governing design standards require project-specific professional review.
Mechanical design and materials
Shaft, fatigue, buckling, bearing, bolt, spring, corrosion and materials calculations can omit stress concentrations, manufacturing tolerances, load spectra, reliability factors, environment, degradation and manufacturer-specific limits. They are not final component selections.
Process, chemical, pressure relief and fire
Process calculations do not constitute a HAZOP, relief-system design, fire-protection design, operating procedure or process-safety approval. Real systems require validated properties, reaction behavior, credible scenarios, safeguards, codes and competent review.
Instrumentation and control
Scaling, signal, PID and dynamic calculations do not establish final alarm, trip, SIL, cybersecurity, control-loop or safety-system settings. Plant dynamics, failure modes, sensor limits and lifecycle requirements remain project-specific.
Water, wastewater, energy and renewables
Results do not establish regulatory compliance, treatment performance, grid interconnection, structural suitability, environmental permitting or bankable energy yield. Local conditions and governing requirements must be applied.
Source status
A published source is displayed only when PROFENG has confirmed the relationship and bibliographic basis. If that exact mapping is not confirmed, the public status is Source being confirmed. A citation does not imply review, approval, affiliation or endorsement by the author, publisher or standards body.
Calculation records
Calculation records preserve inputs, outputs, formula notation, assumptions, source state and automated verification metadata.