πŸ”Š Control Valve Noise & Cavitation Predictor

IEC 60534 Screening β€’ Cavitation/Flashing β€’ Gas Choking β€’ Noise Estimate β€’ Trim Recommendations

Use: Quick screening to identify cavitation/flashing risk and potential high noise.
Note: Final noise compliance must be verified using full IEC 60534-8-4 / vendor tools.

Mode & Units

Pressures & Temperature

Valve / Trim Inputs

Flow & Properties

Key Indicators

Ξ”P = P1 βˆ’ P2: -
Cavitation Index, Οƒ (liquid): -
Choked Limit (liquid), Ξ”Pch: -
Flow Regime / Risk: -

Gas/Steam Checks

x = Ξ”P / P1: -
Choked? (gas): -

Noise (Screening)

Estimated Noise @ 1 m: -
Noise Category: -

Recommendations

Suggested Trim / Mitigation: -
Liquid choking check used: Ξ”Pch = FL2 Β· (P1 βˆ’ FFΒ·Pv) (absolute pressures).
Liquid Οƒ used: Οƒ = (P1 βˆ’ Pv) / (P1 βˆ’ P2). Lower Οƒ β‡’ higher cavitation risk.
Gas choking check used: x β‰₯ xTΒ·Fk (screening). Noise is an engineering approximation.

Technical Notes

Variable Definitions
  • P1, P2: upstream/downstream absolute pressure at the valve (kPa(a) or psia).
  • Ξ”P = P1 βˆ’ P2.
  • Pv: liquid vapor pressure at temperature T (absolute).
  • FL: liquid pressure recovery factor (valve/trim dependent).
  • FF: flashing factor used with Pv in choking limit screening.
  • Οƒ: cavitation index (screening): Οƒ = (P1 βˆ’ Pv)/(P1 βˆ’ P2).
  • x: pressure drop ratio for gas/steam: x = Ξ”P/P1.
  • xT: valve pressure ratio factor (gas), vendor/trim dependent.
  • k: isentropic exponent (Cp/Cv), Z: compressibility factor, MW: molecular weight.

Formulas / Logic (Screening)
  • Liquid choking (incipient cavitation/choked cavitation limit): Ξ”Pch = FL2 Β· (P1 βˆ’ FFΒ·Pv). (Absolute pressures)
  • Cavitation index: Οƒ = (P1 βˆ’ Pv)/(P1 βˆ’ P2). Lower Οƒ β‡’ higher cavitation likelihood.
  • Flashing check: P2 ≀ Pv β‡’ flashing likely (screening).
  • Gas choking check (screening): compare x with a valve-dependent choking limit based on xT and k (vendor/IEC methodology is required for guarantees).
  • Gas density (ideal-gas screening): ρ₁ = (P1Β·MW)/(ZΒ·RuΒ·T), with Ru=8314.462618 kPaΒ·mΒ³/(kmolΒ·K).
  • Noise: engineering heuristic for quick risk banding. For compliance, use IEC 60534-8-4 vendor noise prediction.

Assumptions / Notes
  • This tool is intended for screening and early design checks. Final valve sizing/noise/cavitation class requires detailed IEC 60534 (incl. 60534-2-1 and 60534-8-4) and vendor software.
  • Use absolute pressures consistently. Ensure Pv matches the entered temperature and fluid composition.
  • FL, FF, xT should preferably come from the vendor datasheet for the selected trim and size.
  • If results indicate cavitation/flashing/choking risk, consider staged pressure reduction, low-noise/anti-cavitation trims, or revisiting Ξ”P allocation.
πŸͺ We use cookies to improve your experience. Learn more