Dear mohamedgomaa,

If I understand you right, you must design a suction/pressure unit with one air PD compressor.

From your vacuum and pressure selection, I believe that you know that the suction side influences the pressure side.

That requires a lot of iterative calculations to find the optimum solution.

And the air leakage through the rotary valve influences also both parts of the conveying system (vacuum and discharge).

Part of the PD blower pressure drop is the suction intake pressure drop, the filter-receiver pressure drop, and the ground storage filter pressure drop.

Using a cyclone instead of a self-cleaning filter will destroy your lobe blower.

The Solid Loading ratio is not a variable to choose, but a variable value which emerges from the calculations.

Not knowing your calculation, it is not possible to say whether your calculation is suitable.

It will certainly not be simple. ■

Your figure of SLR of 22 is correct for 5000 m3/hr at exhauster intake

( I am assuming Sm3/hr) and 100 tph (metric).

Assuming no air losses (which is flawed as there will be

RV leakage and since it is a big RV doing almost 200 m3/hr).

The air velocity in the system will be in good range up to 400 m3/hr

of RV leakage. With no bends and vertical sections there is a good

chance it will achieve the rate with the stated rating of the air mover.

Make sure that the filter is generously sized and there is not too much

dp across the filter. ■

From your data follows:

160 kW/22m= 7.72 kW/m

This seems extra ordinally high.

Also the SLR (approx. 27) seems far too low for 22 m length

For a 45 m long suction arm, a SLR of 30 is usual at 0.45 bar vacuum.

Check your calculations. ■