The first thing to do is provide skirting rubbers on the lower conveyor. Extend the cover on the lower conveyor at least 3 belt widths past the chute. Fit rubber curtains inside the lower cover as well as at the exit. Fit a rubber curtain behind the chute, near the tail pulley.

2000 cu.m/h would be enough for a narrow belt and if the height difference is not too great.

Obtain a copy of "Industrial Ventilation" published by The American Conference of Governmental Industrial Hygienists. This will tell you all you need to know.

An 'insertable' filter, installed as you show, will collect the dust and prevent its escape but will put it back on the conveyor so that it becomes a problem again at the next transfer (or discharge point). There will also be a dump of dust when the dust filter stops.

Michael Reid. ■

That is a very common problem that we encounter.

The first ting to do is to take an air flow reading. This can be done by placing an anemometer at the outlet of the transfer chute. This will give an average air velocity. This is then multiplied by the area of the outlet to find a total air flow. The collector required will have to be slightly larger than the airflow generated to create a negative pressure within the chute.

Once that has been calculated, an Insertable can be sized from

http://www.martin-eng.com/products/m...dust-collectormartin torit powercore cpv insertable dust collector

We can size this collector from calculated airflows, but it does not take into account all of the variables in a transfer point, so a measured solution is the best. Based on your information, I was not able to calculate the airflow without the drop height. The height of the drop has a great impact on the air (and dust) generated.

We have a rep in Israel and I am forwarding this application to him.

IN.PC Compant Limited

Power Division

powerin@netvision.net.il

Andrej Deman

972-9-8850084 ■

please contact us.

maybe we can help with our dust suppression system DUSTEX

and the sealing CAREX to avoid dust problems

www.vsr-industrietechnik.dewww.vsr industrietechnik.de

With best regards

VSR-Industrietechnik GmbH

W. Schlabach

Export Manager ■

I agree with Michael Reid's advice. This may even improve the control at Conv.A discharge. If it does not, you may need to install a smaller Insertible Filter on Conv.A discharge hood with similar modification to the hood as suggested by "Industrial Ventilation".

It is rather important to design the transfer points with large ( high and long )hoods to provide surge volume for displacement air and thus reduce the presure build up in the hood that causes the dust leak. The pressure build up in the hoods are directly proportional with the ratio of displacement air to hood volume.

There is now an improved design, low profile, low cost Insertible Filters using a new technology called "POWER-CORE" are available in the market. Please contact www.hawthornesystems.comwww.hawthornesystems.com or cal 419-643-5861 for more information . We will be glad to further advise and provide solutions to your present and/or future dust control problems.

Sincerely,

Unsal Yonak

Vice President

Projects Manager

HAWTHORNE SYSTEMS INC.

312 W.Main Str.

Beaverdam, OH

419-643-5861

www.hawthornesystems.comwww.hawthornesystems.com ■

Please indicate the difference in height between two belts and also the belt speed.

Regards,

cbray ■