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To calculate a drum plant's rate of production:
- Multiply the aggregate tons per hour (x) times 100% minus
the moisture content (y)
- Add the oil tons per hour (z)
- Assume the following x=209, y=4.3%, z=11.76
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 To
calculate the length of a slat conveyor at a 45 degree angle:
- Measure height (h), multiply by 1.41416
- Assume the following: h=65
- Example: 65x 1.41416=91.9204 feet long slat at 45 degrees
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To
calculate the speed in feet-per-minute of a slat conveyor,
the following is needed:
- Motor RPM-(rpm)
- Motor sheave size-(ms)
- Driven sheave size (ds)
- Gear box ratio-(gbr)
- Head sprocket size-(hs)
- Assume the following: RPM=1755, ms=8", ds=14", gbr=25.13,
to 1 and hs=9"
- Calculate the sheave ratio, i.e.: 8" drive, 14" driven
- Multiply motor speed by the answer = input RPM
- Input RPM divided by gear box ratio x diameter of head pulley
x.2618=slat speed in feet per minute
- Example: 8 divided by 14 = .571 x 1755 = 1002.86 input rpm
div. 25.13 gbr head shaft rpm 39.91 x 9 = 359.19 x .2618 = 94.04
FPM
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Baghouse
It requires approximately 165 CFM of air to produce 1 ton of hot
mix.
To find the correct baghouse size of a particular drum:
- Radius x radius x 3.142 (pi) x *1000 = CFM required
- Example: Assume a 9 foot drum. 4.5 x 4.5 = 20.25 x 3.142 =
63.6255 x 1000 = 63,625.5 CFM
- This drum would require a 65,000 CFM baghouse
*1000 equals the air velocity through the dryer/mixer. This figure
is usually down around 750 to 850 fpm, but using the 1000 fpm give
a little bit of over sizing which is a good thing since you don't
want the air flow through the baghouse to limit production rates.
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To
find the square feet of cloth in a particular baghouse
you need
to know the diameter of bag (D), Length of bag (L), and number
of bags (N):
- The formula is: D x 3.142 = A
- A div 12 = B
- B x L = SF (sq. ft. per bag)
- SF x N = total sq. ft. of cloth in baghouse
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To find air to cloth ratio (Should be 5.1 to 1 in batch, and 5.5
to 1 drum plants)
- Determine square footage of an individual bag (X)
- Multiply that by the number of bags (Y)
- Divide that answer by baghouse CFM (Z). X times Y = total square
feet of cloth (sq/ft). Z divide sq/ft = air to cloth ratio
Most manufacturers figure drum air velocity at between 900 & 1000
FPM
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Pumps:
- HL225 .01898 gallons per revolution
- K225 .1055 gallons per revolution
- L225 .23 gallons per revolution
- 2" Q34 .23 gallons per revolution
- 3" Q34 .61 gallons per revolution
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