Pipe equivalent length in pneumatic transportPipe equivalent length for calculation of pressure drop in conveying pipes 

Pneumatic
Transport
Types of pneumatic transport Conveying phases Dilute Phase transport Dense Phase transport Air mover Roots Blower After Cooler Airlock Rotary Valve Product inlet / Injector Piping Pickup
velocity
Conveying speed / velocity Air volumetric and mass flowrate Pipe Equivalent Length Solids velocity in pipe Bends Solids Breakage Pressure drop Pipe Diameter or Bore
Design methods
Pipe Blockage
Powder Buildup
Selecting dilute or dense
phase
Horizontal Conveying
Vertical Conveying

1. DefinitionSeveral methods to calculate the pressure drop expected in a pneumatic conveying pipe and design it is using the notion of equivalent pipe length. This notion is actually quite convenient to simplify the calculation of pressure drop. It converts the singularities of the pipe layout (vertical sections, bends, valves...etc...) into an equivalent length of straight horizontal pipe which is representing the same pressure drop as the singularity. This page is explaining different ways to calculate the pipe equivalent length. 2. Calculation of pipe equivalent length  simplified methodA very simple way to calculate the equivalent length is to count on the pipe layout the length of horizontal pipe, vertical pipes and the number of bends. The pipe equivalent length can be estimated in this shortcut method by L_{e} = L_{h}+2*L_{v}+5*NB With :  Le = equivalent length of the pipe (m) Lh = length of horizontal pipe in the whole pipe layout (m)  Lv = length of vertical pipe in the whole pipe layout (m)  NB = number of bends Do not use this method for detail design. But it can be useful for a preproject or quite troubleshooting on a production line. 3. Calculation of pipe equivalent length  detailed method
Note : this page is under development and review, it will be updated soon. 
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