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Rock Crushers For Sale

Small Portable Rock Crusher

Engines and Generator Sets

Occasionally, a rock crushing plant requires the use of diesel fueled engines to operate plant equipment (not including trucks or front-end loaders) and/or a diesel fueled generator set for electrical power. These engines are a source of air contaminants and must be permitted. The appropriate table must be submitted with the application, as well as, emission calculations for each engine. When a permit for a portable rock crushing plant is being applied for and the expected stay at any one location is less than 12 consecutive months, then the portable generator set may not require permitting. However, if a diesel engine is attached to a crusher machine(or other equipment) as its sole source of power then an authorization for this engine is required regardless of the length of stay at a site. An alternative method of getting an authorization for an engine is through Chapter 106, Exemptions from Permitting, under Permit by Rule 106.512. The application requirements for Permit by Rule 106.512 are stated in the rule and must be submitted in a separate application package.


Transfer Point Emissions

Batch and continuous transfer points occur at various locations in the process. Use the maximum hourly and annual throughput through each transfer point to calculate the hourly and annual emissions. If several points have the same characteristics (controls, through puts) enter the number of like points to decrease the number of calculations required. A second table is provided for additional transfer point calculations, as necessary. If a single conveyor belt length exceeds 300 feet in length, use an additional calculation labeled “Conveying.” Use the equations that follow Table 4. Record the results in the lower portion.

Note: The applicant may use the drop point equation from AP-42 to evaluate drop/transfer points (continuous or batch) if so desired the material transfer point onto a stockpile either from a conveyor or a radial stacker is not considered in these calculations. Emissions generated due to a transfer (either continuous or batch) onto a stockpile are considered in the stockpile emissions calculations. The emission factor identified for stockpiles includes emissions from the transfer onto the stockpile. Further discussion of this concept is found in the stockpile calculation instructions.


Stockpile Emissions

Material stockpiles are a potential source of fugitive emissions due to maintenance of the stockpile and wind erosion. Inactive stockpiles are those affected by wind erosion only. Active stockpiles are those piles that have 8 to 12 hours of activity per 24 hours. Active stockpiles include the following distinct source operations in the storage cycle: loading of rock onto storage piles (batch or continuous drop), equipment traffic in storage areas, and wind erosion of the pile. The active stockpile emission factor includes all three operations above. Calculate stockpile emissions on an hourly and annual basis. Please note, only the annual emission rate will be annotated in the permit.

Record the maximum acreage expected to be covered by stockpiles and the maximum expected active days to calculate the hourly and annual emissions for the stockpile.

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