In the VSMA screen area calculation, Factor A represents the amount of feed that can be handled per square foot of deck area for various size screen apertures.

This basic capacity is an empirical value that has been established assuming that the feed gradation to the deck comprises 25% of material larger than the apertures, and 40% of the feed material less than half the aperture size. It also assumes material weighing 100 lib per cubic foot, and a screening surface with an open area equivalent to a normal duty woven wire.

The calculation factors (G) open area, (B) oversize, (C) halfsize, and the Weight Factor (F) compensate for differences in the original base assumptions (in Factor A), and the actual conditions. ■

Mr Senthilkumar

check

http://vibfem.com.au/resources/vibra...cityPaper.pdf ■

Dear Sir: John's info is correct.......but, you must also......do the most important thing, actually 2 very important things now.

BEFORE YOU CONFIRM THE SIZE OF THE SCREEN NEEDED.

1. You must double check the BED DEPTH CALCULATION using the VSMA formula.........to confirm the size you calculated for above is still OKAY. If bed depth is too deep......screen with carry fines over.

2. It is highly desirable if available, to have someone with experience with the actual material being screened to offer their opinion of the size VSMA picked for you. As the whole calc is by assumptive data in the first place.

Someone who knows, might say .......yeah the size is ok but, in my opinion it should be 7 feet wide or 20 feet long because.....of ABC reason. And they would be right with knowledge.

Keep Smiling.... ■