Dear Ali,

The Solids Loading Ratio (SLR) is depending on the pneumatic conveying properties of the material, the conveying length, the applied conveying pressure, altitude, conveying gas, airflow, pipe diameter, etc..

Neither of these data are mentioned and therefore, it is impossible to answer your question.

I believe that you are operating a centrifugal fan blower, now operating at a high pressure, where the air flow is minimal.

More information is needed, to formulate a more relevant reply.

(Pneumatic conveying is simple in principle, but very complex to calculate)

Best regards

Teus ■

Kindly provide some details for the conveying system, material properties and blower details.

There is no such thing as average solid loading ratio. It will depend on the above mentioned

things. The general range for lean phase system is between 2-10. ■

Pardon: how can you expect to change the line size(s) without knowing the loading ratio, and vice versa?

We have no indication of your blower performance; existing flow regime or material properties.

You need to be more specific. ■

Originally Posted by alekogs

Dear all,

I am working on a rewamping of the existing pneumatic transport system.

Can anyone let me know about the average solids ratio to consider? (To be more specific Phi= MP/3,6*Ma ratio).

I am trying to change the line size in order to eliminate the operation of the blower in the dead zone as per the curve.

Rgds

Ali

===============================================================================

Dear Ali,

You may be using a much higher conveying velocity than that required. Reducing the velocity will be much cheaper than replacing the pipeline. Suggest you calculate the conveying velocity using the blower curve (air flow in cfm) and the pipe line diameter. Then find out what the minimum conveying velocity is.

You can then change the airflow by reducing the blower speed or by using a different impeller, or by venting out some of the conveying air.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting

Email: polypcc@aol.com ■

I your problem solved?

Satinder Chadha ■