πŸ›’οΈ Knockout Drum Sizing (Relief & Flare)

API 521 Screening β€’ 300 Β΅m droplets β€’ Allowable velocity β€’ Mist eliminator β€’ Retention time

Method: Liquid droplet settling in gas using drag correlation (iterative Cd), then allowable superficial gas velocity = SF Γ— Vt (safety factor). Mist eliminator face velocity check included (mesh pad). Retention time gives liquid holdup volume.

Mode & Units

Gas Conditions at KO Drum

Liquid / Droplet Separation

Retention Time & Liquid Flow

Mist Eliminator (Mesh Pad)

Horizontal Options (only)

Gas Properties & Flows

Gas Density, ρg: -
Gas Vol. Flow, Qg: -

Separation (300 Β΅m default)

Terminal Settling Velocity, Vt: -
Allowable Superficial Gas Velocity, Vallow: -
Required Vapor Area, Areq: -

Mist Eliminator Check

Demister Required Area: -
Demister Available Area: -

Vessel Sizing (Preliminary)

Selected Internal Diameter (ID): -
Liquid Holdup Volume: -
Estimated Length/Height: -
Gas density: ρg = (P·MW)/(Z·R·T) (P in kPa, MW kg/kmol, R=8.314 kPa·m³/kmol·K, T in K)
Droplet settling (iterative): Vt = sqrt( (4 g d (ρLβˆ’Οg)) / (3 Cd ρg) )
Allowable velocity: Vallow = SF Β· Vt
Area: Areq = Qg / Vallow (Qg in mΒ³/s)
Liquid holdup: Vhold = (ṁL/ρL)·tret
πŸͺ We use cookies to improve your experience. Learn more