Rules of Thumb
Heat Exchangers
  1. Take true countercurrent flow in a shell and tube exchanger as the basis for comparison.
  2. Tubeside is for corrosive, fouling, scaling and high pressure fluids.
  3. Shellside is for viscous and condensing fluids.
  4. Pressure drops are 1.5 psi for boiling liquids and 3-9 psi for other services.
  5. Double pipe exchangers are competitive at duties requiring 100-200 ft².
  6. Plate and frame exchangers are suited to sanitary service, and, in stainless steel, are 25-50% cheaper than shell and tube units.

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 Filtration Heat Exchangers Mixing and Agitation
Particle Size Enlargement Piping Pumps Reactors Refrigeration
Filtration Size Seperation of Particles Utilities, Common Specifications Vessels (Storage Tanks) Mixing and Agitation
C O N T A C T   G L Y D E