total pipe length = 135 mm and 2 elbows???????????????

Why bother with a conveying system.

Where have you got the solid friction factor from? ■

Dear anil0298,

From the attachment it is clear that the pipe length is 137 m.

Assuming an average particle size of 1 mm (0.001 m) and the material density, the suspension velocity should be around 8 m/sec

That requires an end velocity of approx 32 m/sec.

From your data it can be derived that you are using approx 0.148 m3/sec of air.

Combined with 1.5 tons per hour (0.417 kg/sec) this results in a SLR of 2.35

This must be considered very low, but that could also be the intention, looking at your very low calculated pressure.

Although, a pressure of 0.1 bar seems already the resistance pressure of an air only pipe.

Going through your calculation, to check it, is almost undoable, not knowing the background of your calculation system.

I understand the calculation problems of these types of pneumatic installations by someone who had not the chance of learning by trial and error. The right figures and calculation algorithms are not easy available.

Where have you got the solid friction factor from?

success ■

Dear anil0208,

As I am not familiar with the books, you used, I cannot comment on that.

Regarding your test-setup, it will certainly generate information.

How this information is processed, depends on the calculation method, which you apply.

As the test pipe is short, a lot of the pressure drop will be contributed to acceleration, speciall with the 2 bends.

Scaling up from 3” to real dimensions, where flows can become turbulent, can also be very difficult.

Maybe, the pressure taps should be located at the sides of the flow after a bend.

This, to be as sure as possible that you only measure static pressure, without a dynamic pressure component.

But, you have to start somewhere.

Success. ■