Dear Chris Jiang,

The pressure drop in a vacuum system is somewhere between 0 bar and 1 bar.

The minimum pressure drop is with air only through the conveying system, whereby the vacuum pump is suctioning the maximum airflow in kg/sec

With a vacuum of 1 bar, the absolute pressure at the vacuum pump inlet is zero, resulting in an air flow of 0 kg/sec.

Your pneumatic conveying design must be for the situation, whereby the conveying rate, air velocity and pipe diameter matches the airflow and the resulting vacuum.

Using an ordinary positive displacement blower, the maximum vacuum is 0.5 bar.

Designing for a SLR of 10 – 20 will define the airflow in kg/sec with the design conveying rate.

Success ■

For conveying tea, conveying velocity should be low to reduce breakage of tea particles. Use of dense phase will reduce particle breakage. Also, use sanitary construction equipment to prevent contamination.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting ■

Originally Posted by kevinjcg

Dears

i will design a tea powder vacuum conveying system, tea powder bulk density: 0.3, conveying distance: 20m, vertical distance: 11, if i use LSR:10-20, how much pressure drop is necessary for system.

Best Regards

For tea, a dense phase conveying system will be better than dilute phase. Dense phase will minimize particle attrition and dust in tea.

Amrit Agarwal

Pneumatic Conveying Consulting ■