# Thread: Review and help needed for pneumatic conveying system design

1. ## Review and help needed for pneumatic conveying system design

Hello,
so, I am designing open system vacuum conveying system similar to as shown in attached photo.Review-of-pneumatic-conveying-system[5].jpg.
I have following data estimated(as per logic diagram attached here. Courtsey: pneumatic conveying design guide by David mills..)Capture.PNG

Available data
Bulk density of :
-Material flow rate required(Mp)=10,000kg/h
-Conveying distance(L)=45m
-Pipe bore(guessed)(d)=0.2032m/(8")
-Delta P(pressure drop)=?
-Conveying air inlet velocity=36m/s
-Air mass flow rate(Ma)=1.32kg/s
-Air requirements= 1.617 cubic-meter/s or 3426.2 CFM.

As shown in the image there will be two 90 degree bends. and cyclone inlet is located at 10 feet height(so vertical height of pipe around 8 feet)
Assumption:Pressure at the inlet of the pipe(from which the material will enter) will be equal to atm. pressure
I am also attaching an image of cyclone design parameter as shown in the book. cyclone.PNG

I wanted to know whether the calculations are correct and how to design the cyclone from available data.
Any help will be much appreciated.

Thanks

2. Dear Vishal Panchal,

From the information in your installation description, the following remarks:

The material and the material properties are not given.
The material losses cannot be estimated.

The solid loading ratio can be calculated as material mass flow divided by the air mass flow.
SLR=10000/3600/1.32=2.1

-Delta P(pressure drop)=?
The pressure drop (vacuum) can be calculated as:
Vacuum = 1.13/1.617-1=0.3 bar.

A cyclone in combination with a positive displacement vacuum pump is not a good idea.
A cyclone does not filter all the dust, which then passes the blower, which will wear out fast.

It is not clear, whether all the partial pressure drops are calculated.
(air, velocity, acceleration, suspension, material/dust separator, rate control, etc.)

Apart from designing a vacuum system, the technology is also an important issue, s.a. nozzle intakes, valves, rotary valve(-leakage), etc.

Take care