How to Plan Air Treatment Around a New Bobcat Industrial Air Compressor
Before you order a new Bobcat compressor, decide what condition the air needs to be in when it reaches production. That means defining moisture, particle, and oil limits, then sizing the dryer, filters, drains, and connecting piping for the airflow they’ll actually handle.
The mistake is treating air treatment as an accessory selected after the compressor. A larger compressor can expose an undersized dryer or restrictive filter that worked reasonably well with the old machine. You get more air at the compressor but wet air or low pressure at the equipment.
For facilities evaluating Bobcat industrial air compressors in Chattanooga, the practical approach is to plan the compressor and treatment package together, using measured demand, production requirements, and Tennessee summer conditions—not just matching connection sizes.
Start With the Air Quality Your Equipment Requires
Ask production equipment suppliers for their compressed air requirements before comparing packages. “Clean, dry air” isn’t a specification. A pneumatic cylinder, a paint process, and an instrument air application may need different treatment.
Gather these requirements:
Minimum pressure at the machine: Under operating flow, not while equipment is idle.
Peak and sustained airflow: Including overlapping production cycles.
Moisture limit: Preferably stated as a pressure dew point.
Particle and oil limits: Including whether oil vapor matters.
Application-specific requirements: Particularly where air contacts products or sensitive processes.
ISO 8573-1 purity classes can help document particle, water, and oil requirements, but the application determines which classes are appropriate. Don’t assign the entire plant the strictest requirement without evaluating whether point-of-use treatment makes more sense.
For example, a small specialty process may justify dedicated polishing filtration while general shop air uses a common treatment system. That decision can avoid unnecessary pressure loss and maintenance across the whole plant.
Match Treatment to the Selected Bobcat Package
Confirm the configuration of the Bobcat compressor being quoted. Review its rated delivery at your intended operating pressure, cooling arrangement, discharge conditions, controls, and any included treatment equipment. Don’t assume a package includes a dryer, moisture separator, or every filter your application requires.
With an oil-flooded rotary screw compressor, downstream treatment must address moisture, particles, and lubricant carryover to the required level. The compressor’s internal air/oil separator is not a substitute for application-specific filtration.
Have the supplier identify the boundaries of the package: what leaves the compressor, what treatment is included, and what remains to be installed. Use current model documentation rather than assuming another Bobcat configuration has the same features.
Size for the air that passes through treatment
A dryer should not be selected from compressor horsepower alone. Its usable capacity depends on inlet air temperature, operating pressure, ambient conditions for air-cooled equipment, and the required outlet dew point.
Ask for the manufacturer’s correction factors applied to expected site conditions. A catalog flow rating at reference conditions isn’t automatically the available capacity in a hot compressor room.
Also account for:
Whether existing and new compressors will feed the same treatment train.
Future production additions that are reasonably defined.
Dryer purge consumption, where applicable.
Short flow surges created by production demand and receiver placement.
Leave documented growth capacity rather than selecting an arbitrary oversized package. A treatment system should fit both today’s operation and the planned expansion.
Choose the Dryer by Dew Point, Not Habit
Pressure dew point is the temperature at which moisture begins condensing from compressed air at its operating pressure. The target should account for the coldest conditions the downstream piping and equipment will experience, with an appropriate operating margin.
Refrigerated drying for suitable indoor applications
A refrigerated air dryer is often suitable for general industrial air where its rated pressure dew point meets the application requirement and downstream piping stays warmer than that dew point. It cools the air, separates condensed water, and drains that water away.
Chattanooga’s humid summers increase the amount of moisture entering the compressor. High compressor-room temperatures can also make heat rejection harder and increase dryer inlet temperatures. Both belong in the selection review.
Humidity alone doesn’t tell you whether the dryer is undersized. A fouled aftercooler, poor ventilation, or failed drain can contribute to water problems too.
Desiccant drying for lower moisture limits
A desiccant dryer may be appropriate when equipment requires a lower pressure dew point or piping encounters temperatures below what refrigerated drying can accommodate.
Compare regeneration methods, energy requirements, purge air consumption where applicable, filtration requirements, and maintenance access. Desiccant drying isn’t automatically the better choice for every plant. It should solve a defined moisture requirement.
Give Filters, Receivers, and Drains a Defined Job
Each part of the treatment train handles a different problem. A bulk moisture separator removes liquid droplets; it doesn’t remove water vapor. Coalescing filters remove liquid aerosols, including oil and water, but they don’t replace a dryer or reliably remove oil vapor.
If the application limits oil vapor, a suitable adsorption stage may be needed. Its performance depends on inlet conditions and proper upstream treatment.
A typical arrangement might include aftercooling and bulk separation, a wet receiver, dryer-specific prefiltration, the dryer, and downstream filtration as required. Desiccant systems commonly need protection from upstream oil aerosols and downstream filtration for desiccant dust. Final sequencing should follow the equipment manufacturers’ requirements.
Receiver placement affects treatment flow. A wet receiver upstream can collect additional condensate and support compressor operation, but it stores untreated air. A dry receiver downstream stores treated air and can help serve short demand bursts without forcing the same instantaneous flow through the dryer.
Neither arrangement fixes sustained demand above treatment capacity.
Provide properly selected condensate drains wherever water collects, along with access for inspection and service. Route oily condensate to suitable condensate management equipment and confirm local disposal requirements. Don’t assume it can go directly into a floor drain.
Check Pressure Loss Before Raising the Setpoint
Budget pressure loss through separators, dryers, filters, valves, and connecting piping at expected flow. Review both clean-filter conditions and the manufacturer’s element replacement criteria.
A new compressor won’t correct an undersized filter housing or a restrictive connection to old plant piping. Raising discharge pressure may hide that restriction while increasing operating cost.
Specify accessible pressure measurement points around treatment components. Differential-pressure indicators help maintenance track filter restriction, but they don’t prove the air meets moisture or oil limits.
A Chattanooga Expansion Example
Consider a machine shop adding another CNC cell and a new Bobcat compressor. The existing refrigerated dryer still runs, so keeping it looks reasonable.
Before reusing it, compare its corrected capacity against the new compressor’s delivery and any simultaneous flow from the existing machine. Check dryer inlet temperature during a loaded shift, drain operation, and pressure loss across the existing filters.
If the shop also has piping through an unheated loading area, review winter pipe temperatures. A dryer suitable for the conditioned production floor may not prevent condensation or freezing in that colder section.
The answer might be a larger dryer, separate treatment trains, better heat rejection, or local treatment for a particular branch. Inspection and operating data should decide—not the fact that the old dryer turns on.
Put Acceptance Checks in the Installation Plan
Before startup, agree on how performance will be verified during representative production loads. Include delivered pressure, pressure loss through treatment, dryer inlet conditions, drain function, and pressure dew point where the application warrants monitoring. Sensitive processes may also need particle or oil testing.
Maintenance teams can safely review displays, record accessible gauge readings, observe drain discharge, check for blocked ventilation, and track when water appears. Opening filters, servicing pressurized drains, electrical work, and internal repairs belong with trained personnel following isolation and lockout procedures.
Plan maintenance access and any required treatment redundancy before installation. A bypass may keep air flowing during service, but it also sends untreated air downstream unless an alternate treatment path is provided.
Bottom Line
Choose the air quality target first, then select the Bobcat compressor and treatment equipment as one system. Require corrected dryer sizing, a filtration plan, a pressure-loss review, and a layout that accounts for storage, drainage, service access, and growth.
Contact Industrial Air Services to discuss a Bobcat compressor and air-treatment consultation for your Chattanooga-area facility. Bring equipment air requirements, production schedules, and existing system information so the discussion starts with what your plant actually needs.
Industrial Air Services is an authorized Bobcat® Industrial Air Compressors distributor serving Central to East Tennessee, including Nashville, Knoxville, and Chattanooga.
(615) 641-3100
138 Bain Drive • LaVergne, TN 37086
