Reaction Relief Sizing

Reaction Parameters

Reaction Type

Reaction Volume

ft³

Reaction Enthalpy (-ΔH)

BTU/lb-mol

Reaction Temperature

°F

Concentration [A]

mol/ft³

Concentration [B]

mol/ft³

Rate Constant (k)

1/hr

Specific Heat Rate

BTU/hr-ft³

Vessel & Liquid Properties

Reacting Mass

Specific Heat (Cp)

BTU/lb-°F

Latent Heat (λ)

BTU/lb

Vessel Volume

ft³

Vessel Fill

Vapor Density

lb/ft³

Typical: Cp = 0.4-0.6 BTU/lb-°F, λ = 150-200 BTU/lb

Relief Device Parameters

Relief Type

Set Pressure

psig

Back Pressure

psig

Molecular Weight

g/mol

Specific Heat Ratio (k)

Cp/Cv

Discharge Coefficient

Discharge Coefficients:
Conventional: 0.975 | Balanced: 0.85
Rupture Disk: 0.62 | Pilot: 0.95

About This Calculator

Emergency relief sizing for runaway reactions per AIChE/DIERS methodology and API RP 520/521.

Key Aspects:

Heat Generation: Reaction kinetics
Stability: TMR, self-heat rate assessment
Relief Sizing: Vapor generation method

Reaction Parameters

Vessel & Liquid Properties

Relief Device Parameters

Reaction Relief Results

About This Calculator

Key Aspects:

Related Calculators

Gas Density

Pipeline Hydraulics

Line Sizing

Pipe Volume