Rules of Thumb

Selecting & Designing Equipment

Hints and Rules can be provided for many types of equipment - from compressors to distillation columns, to heat exchanges, to vessels. Such guidelines are useful in preliminary design calculations and cost estimates.

These hints may be valuable for preliminary design and cost-estimating. They have been obtained from a variety of sources and publications and are intended as a helpful first estimate only.
The hints given here are subject to various qualifications. Accordingly, most of the rules are best applied by experienced engineers familiar with their application. Glyde would like to emphasise whilst helpful the use of these hints is at the complete risk of the user and professional advice should be obtained for specific designs.
We ask that all people adopt the much vaunted concept "When in doubt ASK"  
Ask Glyde

These hints are from a variety of sources including SM Wales, Perry Chemical Engineers Handbook, and others with more information on these available from

H I N T S  A N D  R U L E S

Drying and Solids

Conveyors for Particular Solids

Cooling Towers

Compressors and Vacuum Pumps

Crushing and Grinding

Extraction, Liquid-Liquid

Crystallatisation from Solution


Heat Exchangers

Mixing and Agitation

Particle Size Enlargement





Previous Hint

Size Seperation of Particles

Utilities, Common Specifications

Vessels (Storage Tanks)

Next Hint (Drying and Solids)

C O N T A C T   G L Y D E

The information is arranged by commonly recognised categories. In some instances, definitions and general statements have been included for clarity.