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Home Calculation Methods
Calculation Methods
This section provides guidance on how to perform some chemical engineering calculations that are common in the process industries.  It also provides guidance on how to layout a formal calculation so that it can be checked and be understood by other engineers. 
 

Preparing Calculations

abacus_small

Almost any design involves calculations, ranging from scoping estimates to detailed sizing calculations. Whilst style is a matter of personal taste, this article gives a few pointers on how to prepare process engineering calculations.

 

Calculating Liquid Volumes in Partially Filled Tanks

gunpowder_vessel

This article describes how to calculate liquid hold-up in partially filled horizontal vessels – including in ones with domed ends.

 

Calculating Bubble & Dew Points for Ideal Mixtures

Calculation of the bubble and dew points of a mixture is key to the understanding of distillation columns.  This article describes how to calculate bubble and dew points for ideal mixtures.

 

Use of the Ideal Gas Equation

ideal_gas_eqn_2The Ideal Gas Equation is one of the most common equations found in chemical engineering.  When can it be used and when is a more sophisticated equation required?

 

Calculating Radioactive Decay

radioactivityProcess engineers working in the nuclear industry sometimes need to calculate rates of radioactive decay.  This article explains how to do this.

 

Choked Flow in Gases

orifice plateAny calculation of gas flow through a restriction should consider whether the flow will be choked.  This article explains how.

 

Calculating Liquid Pressure Drops across Control Valves

valve_small

Control valves are frequently used to regulate flow.  This article describes how pressure drops across control valves can be calculated in liquid service.

 

Calculating Pressure Drops in Pipe Fittings

pipes_smallOften pipe fittings, such as valves, bends and other items, make up a big chunk of the total pressure drop.  This article discusses how pressure drops in pipe fittings can be estimated.

 

Calculating Pressure Drops in Straight Pipe

Straight Pipes
This article discusses how to estimate pressure drops for fluids flowing down straight pipe.

 

Calculating Pressure Drops in Gas Pipelines

pressure_gauge_smallPressure drop for gas flow is made complicated as gases are compressible.  This article discusses how to calculate pressure drops in gas systems.