Here is a bit more of the iceberg: :>))

1. Two deck VS is always better, gives much more flexibility now and in the future. Can be used as a load reliever deck also, to take the BED DEPTH or thickness of the mat of material down to acceptable depths.

2. Making the deck a large one surface unit would NOT be practical. Can not spread to wide widths, can not put a shaft in a very wide unit easily, not practical and the rule of thumb for V.S. is plus/minus relationship of 1 to 3 dimension for WIDTH vs LENGTH.

3. You can change the aperture later no problem, you will handle the TONNAGE assuming the SIEVE analysis of the particle gradations in the FEED MATERIAL are basically the same as the original job.

4. Proper SETUP means the following: that the speed of the V.S. box is proper and the STROKE of the V.S. is proper and the SLOPE of the V.S. is proper for the job that one is trying to do.

short example: coarse screening (BIG material) would typically be a lower SPEED of say 800 RPM range, larger STROKE of say 1/2" circle and lower SLOPE or angle of say 15 degree .

CONVERSELY, fine screening would be setup with faster RPM say 1400, smaller stroke say 3/16" circle or smaller, and steeper SLOPE of say 22 to 25 degrees.

CAPACITY: is expressed usually by a customer asking for 500TPH OF -25mm product. Feed is expressed as say.....100% of feed material passing say 50mm down to dust going to the V.S.

Lots more ICEBERG to go............... ■

1. Yes, applies to both screens.

2. Spreading sideplate to sideplate immediately at top of screen WILL in fact decrease bed depth and increase efficiency.

3. Motors are sized to accomodate the total static weight of the body that the motor has to turn from a dead stop. On electric motors for VS, that typically are hi startup torque or hi efficiency standard motor but, twice the hp if using standard TEFC motor.

We only need lots of amps at start but, once the heavy side of the shaft or counterweighted wheel turns over the 12 oclock position.......we are off and running and will run at half motor amps from then on.

4. Different designed bodies require different motor configurations. Modules are driven SEPARATELY or independently requiring smaller hp per module vs ONE BIG BODY which requires more HP to start and to drive.

Wishing you happy vibrations...... ■

Probably because if only one deck at 25mm......the BED DEPTH or thickness of the MAT of material on one deck only would in fact EXCEED the VSMA rules FOR recommended bed depth at a specific opening.

VSMA states the BED DEPTH at the "discharge end" or 20 foot mark in this case should NOT EXCEED 3 times the opening in the wirecloth or other media.

If we tried to do this all on one deck only.......the bed depth at this tonnage would probably exceed 3 times 25mm DEEP...and this would cause the screener to carryover FINES....due to the stroke not being able to stratify the COARSE to allow fines to find their way thru the 25mm opening.

Hope this does not confuse..... ■

BOTH styles would easily do the job.

1. Screening at 25mm (1") most VSMA and other screen manufactures charts will identify you should easily pass 3.13 TPH per square foot of screen on the low side to 3.56 STPH per square foot on the high side.

Let's take an average: and call it 3.35 STPH passing per sq foot

2. So....850 STPH divided by 254 square feet of screening area is theoretically required to do this job. 10x24 = 240 sq feet x 2 decks = 480 sq feet availability. YOUR machine E10242

2. Other assumptions are 18-20 degree slope 100# per cu foot weight of material and screening at 95% efficiency

3. The other OMNI units are not enough square footage to do the job. The differential slopes are no prob, and basically will help vs hinder production rates.

4. Crushed limestone is pretty free flowing granular material and nice to screen

5. You will want to make sure the STROKE or circle on the screen we picked above is set up properly to do the 25mm separation. YOu will want to be 3/8" stroke around 850 plus/minus RPM range running WITH the FLOW of material not uphill or counterflow.

Hoping this is remotely helpful. George Baker - Moderator ■

In reviewing my post, i see I said both units would do the job...but as mentioned further in the posting.......only one has enough square footage to do the job.

Sorry bout that. Keep Smiling.

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