Dear kchetan,

Measuring the pressure drop in a pneumatic conveying system is quite easy.

Measure the pressure at the outlet of the convey air compressor ( = approx. pressure intake conveying system) and the pressure at the end of the conveying system (normally approx ambient pressure)

The difference between the 2 measurements is the pressure drop over the system under the conditions prevailing during the measurement.

For the measurement an ordinary manometer will do.

When a pneumatic conveying system (PCS) is going to be used for another solid, the installation should be recalculated for that new material.

The important property in this respect is the suspension velocity of that new material.

Depending on the suspension velocity of the new material compared to the used material and the required capacity determines the need to change the installation.

This can involve the airflow (compressor), pipe size and filter installation.

In addition, the safety implications of the new product need to be evaluated. (F.i. explosion risk)

Your question was general, for a more detailed and specific answer, you need to inform the forum in more detail.

Have a nice day.

Teus ■

Dear kchetan,

Visit the following site:

Pneumatic conveying, Performance and Calculations:

https://news.bulk-online.com/?p=65

The technology of pneumatic conveying is simple in its principle, however, a mathematical description is very complex, due to the number of parameters and the relations between them.

A summary of those parameters (but not complete) is:

Suspension velocity

Material loss factor

Phenomena related pressure drops (gas, elevation, suspension, acceleration, material)

Gas velocity

Product velocity

Acceleration

Bend friction

Sedimentation

Operational altitude

Temperature

Turbulence

Velocity profile

Residence time of particle in pipeline

Drag factor

Particle density

Bulk density

Compressor- or vacuum pump characteristics

Material flow properties

Etc.

All these parameters have influence on the gas conditions, which are subject to the gas laws.

A calculation algorithm describes the relation between all these parameters and physical laws, among which the most important of all is the law of conservation of energy.

A change in one parameter influences the gas conditions and as a feedback mechanism, all the other parameters influence the gas conditions again.

This makes the calculation of a pneumatic conveying system so complex.

In addition, a pneumatic conveying designer has to have extensive field experience to design the equipment and controls, making a system work.

Everybody has to start as new in this field and it takes quite some time to become an expert in this industry when guided by older engineers, learning from their mistakes and field events.

It is possible.

Success

Teus ■

Dear KChetan

Designing pneumatic conveying system (such as prediction of pressure drop, minimum transport condition etc) invloves many flow and solids parameters (many of them are already mentioned in the previous post) and the models are generally based on empirical work (pilot plant testing). You can start with the Marcus text... I think you can get some models there.

regards

ssmallick ■