Pair air storage with a Bobcat industrial air compressor by working backward from the plant’s demand: how much air a production event needs, how long it lasts, and how far pressure can fall before equipment struggles. Then match receiver volume, placement, and compressor controls to that operating window.
Don’t select a tank by horsepower alone. Two plants using similar compressors can need very different storage arrangements. One runs steady air demand all shift; another has several machines pulling hard for a few seconds at a time.
For facilities evaluating Bobcat industrial air compressors in East Tennessee, the useful question isn’t simply, “What size tank goes with this compressor?” It’s, “What does this system need storage to accomplish?”
Decide What the Receiver Needs to Do
An air receiver holds compressed air that the system can release as pressure falls. Its usable capacity depends on both tank volume and the allowable pressure drop. A large tank with a narrow usable pressure range may provide less help than expected.
Storage typically serves three purposes:
Support short demand peaks: Supply part of a brief air requirement that exceeds compressor output.
Support compressor control: Slow pressure changes so the compressor doesn’t react to every small demand fluctuation.
Protect a demanding application: Place stored air near a machine whose short bursts disturb the plant header.
Storage doesn’t create air. If production consumes more than the compressor can deliver throughout the shift, a larger receiver only delays the pressure loss. There must also be enough spare compressor capacity between events to refill the tank.
Match Storage to the Specific Bobcat Compressor
Start with the proposed Bobcat model’s current performance data, not just its motor horsepower. Verify delivered airflow at the intended operating pressure, control method, allowable operating range, and manufacturer guidance for system volume.
The control method changes what storage needs to accomplish.
Fixed-Speed and Load/Unload Operation
On a load/unload rotary screw compressor, receiver volume influences how quickly pressure moves between control settings. Too little effective storage can produce frequent transitions. However, a larger tank won’t automatically reduce energy use; results depend on demand, unloading behavior, control settings, and how long the machine remains unloaded.
If the selected compressor uses start/stop control, allowable motor starts and minimum run times also matter. Those limits should come from the equipment documentation.
Variable-Speed Operation
A variable-speed compressor adjusts output within its operating range, but it still benefits from storage. The tank helps cover sudden demand changes while the compressor responds. Storage can also matter when demand falls below the machine’s minimum controllable output.
Have the supplier review the selected Bobcat compressor’s controls alongside existing machines. Adding a new compressor and receiver without coordinating pressure settings can leave older equipment loading unnecessarily or machines working against each other.
Size for Usable Air, Not Just Tank Gallons
A gallons-per-CFM rule can provide a preliminary check, but it isn’t a complete sizing method. For a production event, collect:
The event’s airflow requirement and duration.
The airflow the compressor can contribute while serving other plant loads.
The receiver pressure available before the event.
The lowest acceptable receiver pressure after allowing for downstream losses.
The time available to recharge before the event repeats.
The difference between event demand and available compressor contribution is the airflow deficit. Storage must cover that deficit for the required duration.
A simplified receiver estimate is:
Receiver volume in gallons = 7.48 × airflow deficit × event duration × atmospheric pressure ÷ allowable pressure drop.
For this expression, use airflow in cubic feet per minute referenced to local atmospheric pressure and temperature, duration in minutes, and pressures in psi. Atmospheric pressure is absolute; the allowable pressure drop is the difference between starting and ending receiver pressures. If using SCFM, the reference conditions need to be reconciled. The estimate assumes approximately constant temperature.
This is a starting calculation, not a final equipment selection. Rapid discharge, changing compressor contribution, existing connected storage, and restrictions between the receiver and machine can change the result. A compressed air system audit can establish those conditions under actual production loads.
Don’t increase system pressure simply to make the calculation favor a smaller tank. Higher pressure can increase power demand and leakage, and every component must remain within its rating.
Choose Wet Storage, Dry Storage, or Both
Receiver placement affects more than pressure stability. It also changes how air moves through the treatment equipment.
Wet Storage Before the Dryer
A wet receiver typically sits downstream of the compressor’s aftercooler and moisture separator but upstream of the dryer. It can collect additional condensate as air cools and provide volume for compressor control.
It needs dependable drainage. A tank holding standing water loses usable air volume and may develop internal corrosion. Wet storage also doesn’t bypass dryer capacity: air released toward production still has to pass through the dryer and associated filters.
Dry Storage After Treatment
A dry receiver stores air downstream of the dryer and appropriate filtration. It can supply a brief downstream demand peak without requiring that entire instantaneous flow to pass through the dryer at that moment.
The dryer still needs to handle the sustained production and recharge load. Its capacity must be checked against actual inlet temperature, pressure, and ambient conditions—not just a nominal airflow rating.
That matters during humid Tennessee summers, especially in hot compressor rooms. Storage cannot correct an overloaded dryer or failed condensate drain. Poorly treated air entering a dry receiver remains poorly treated air.
Some systems benefit from both wet and dry storage. Others need a simpler arrangement. Air quality requirements and compressor pressure-sensing locations should guide the design.
Put Storage Where the Pressure Problem Happens
Consider a Knoxville machine shop planning a Bobcat compressor purchase after adding a machine with a brief, high-flow blowoff cycle. The compressor-room gauge looks steady, but pressure falls at the far end of an older distribution line whenever that cycle starts.
That doesn’t prove the compressor is undersized. The branch piping, filter, regulator, or hose connection may restrict delivery. A larger receiver beside the compressor may offer little improvement if air still can’t reach the machine fast enough.
A properly designed local receiver may help cover the burst. Its outlet piping must support the required flow, and it needs time to recharge. Depending on the arrangement, engineered check valves or flow controls may keep other plant demand from draining the reserve.
Those components require professional selection. A poorly placed restriction can make the original problem worse, while added isolated storage creates additional stored-energy hazards during maintenance.
What Maintenance Can Check Before a Consultation
Useful observations don’t require opening equipment or changing controls. Gather:
Compressor display pressures and operating states during normal production and demand peaks.
Existing gauge readings near the affected machine at the same times.
Receiver nameplate information, location, and documented inspection history.
Visible drain problems, external corrosion, or leakage.
Accessible filter differential-pressure readings and dryer alarms.
Production cycle timing, upcoming equipment additions, and maintenance records.
Never open a pressurized receiver, remove fittings, adjust relief devices, or attempt tank repairs. Inspection, installation, and control changes belong with qualified personnel using proper isolation and depressurization procedures.
A receiver proposal should address pressure-vessel suitability, applicable Tennessee requirements, relief protection, drainage, safe access, supports, and piping connections—not just gallons and price. Existing tanks shouldn’t be reused solely because they appear sound externally.
Bottom Line
The right storage package gives a Bobcat compressor enough usable system volume to support its controls and meet short production peaks without dropping below machine requirements. That means checking demand duration, available pressure, recharge time, treatment capacity, and receiver location together.
Before buying, ask for a recommendation that explains both the receiver size and why it belongs in that location. Include planned expansion, but distinguish brief future peaks from sustained demand that may require more compressor capacity.
Contact Industrial Air Services to discuss a Bobcat compressor and air storage arrangement for your Tennessee facility. Bring your current equipment information and production requirements so the consultation starts with how your plant actually uses air.
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
