The Castair 240 Gallon Tank Adder (ADDER240GALLON) adds a 240-gallon horizontal ASME receiver tank to your existing compressed air system. This is not a compressor -- it is a storage tank that connects to your current system and substantially increases your available air volume. The 240H200 and 240HD200 tanks that this product covers are Cast Air's largest standard receivers, rated to 200 PSI and weighing 700-790 lbs when empty.
If your compressor is cycling every 30-60 seconds during peak use, or if pressure sags when multiple tools are running simultaneously, the problem is usually storage volume, not compressor output. Adding a 240-gallon receiver solves that problem without replacing functioning compressor hardware. This is also the correct approach when adding a new service bay to an existing air system: expand storage at the main header rather than installing a second compressor.
Key Features
- 240-gallon capacity: Cast Air's largest standard horizontal receiver -- substantial buffer volume for high-demand shop environments
- 200 PSI ASME rating: Pressure vessel constructed and stamped to ASME code; the 200 PSI rating gives adequate headroom above standard shop operating pressures of 90-175 PSI
- Horizontal orientation: 30" x 84" footprint -- designed for floor installation in a compressor room or along a wall
- Dual top plate options: Available with either 17" x 44" or 17" x 85" top plate to match your plumbing layout and manifold requirements
- All-cast-iron construction where applicable: Cast Air builds to their standard of durability; this is not a thin-wall import tank
- Add-on design: Connects to an existing compressor system via standard pipe connections -- expands storage without replacing current equipment
- Drain provisions: Bottom drain connection for routine moisture purging -- essential for tank longevity and air quality in humid shop environments
240 Gallon Tank Specifications (240H200 / 240HD200)
- Capacity: 240 gallons
- Pressure Rating: 200 PSI (ASME coded)
- Orientation: Horizontal
- Dimensions: 30" diameter x 84" length
- Top Plate Options: 17" x 44" or 17" x 85"
- Weight: 700-790 lbs (empty)
- Certification: ASME pressure vessel code
What Does "Tank Adder" Mean
A tank adder is a receiver tank that connects to your existing compressor system to increase total storage volume. Your compressor continues to run as the air source. The additional tank acts as a buffer -- the compressor fills both tanks, and your air tools draw from the combined volume. The practical effects are:
- Longer run times between compressor cycles -- the motor runs less frequently
- Less pressure drop during peak demand -- you have more stored volume to draw from before the compressor needs to top it off
- Better sustained flow for high-CFM applications like spray booths and blast cabinets
- Reduced wear on the compressor motor and pump from fewer start-stop cycles
The tank adder approach makes sense when your compressor has adequate CFM output but insufficient storage. If your compressor is undersized in CFM for the tools you are running, adding storage volume helps but does not fix the root problem -- call us and we will help you diagnose which issue you actually have.
When Does a Shop Need a 240-Gallon Tank Adder
This is the right solution when:
- Spray booth operation: Body shops running HVLP guns need sustained CFM. A compressor cycling every minute interrupts finish quality. 240 gallons of additional storage eliminates that cycle during most spray jobs.
- Multi-bay simultaneous use: Three or four bays running impact wrenches, air ratchets, and lifts at the same time creates demand spikes that a standard receiver cannot buffer. Additional storage absorbs those spikes.
- Blast cabinet rooms: Abrasive blasting requires sustained high CFM. Even with an adequate compressor, a standard 60-80 gallon tank cannot supply the volume needed for extended blast sessions without constant cycling.
- Adding a new service bay: Before running a second compressor, check whether your existing unit has the CFM output to serve the expanded system. If it does, a storage adder is a fraction of the cost of a second compressor.
- Industrial production lines: High-cycle pneumatic tools in production environments create consistent demand that standard storage cannot buffer efficiently.
This is likely not the right solution when your compressor is genuinely undersized in CFM -- adding storage helps temporarily but the compressor will run continuously trying to keep up. Call us and describe your setup; we can tell you whether this tank or a different solution is the right call.
Castair Large Tank Lineup -- Putting the 240 in Context
Cast Air offers remote tank options for shops that need to expand storage beyond their primary compressor. The 240-gallon is the largest standard receiver in the Cast Air lineup:
- 240H200 / 240HD200 -- 240 gallons, 200 PSI, 30"x84", 700-790 lbs: This product -- the largest standard Cast Air receiver
- Smaller receivers: Cast Air offers smaller horizontal and vertical tanks for shops with less space or lower storage requirements; call for current availability and pricing
- Custom remote tanks: Cast Air lists "Remote tanks available -- call for quote" for configurations outside the standard lineup
If 240 gallons is more than your situation requires, call us -- we can help you size the right tank rather than having you over-buy storage you do not need.
Installation Considerations
Before ordering, confirm the following:
- Floor load capacity: At 700-790 lbs empty, plus the weight of compressed air and condensate, this tank requires a concrete or reinforced floor. Verify your floor rating before installation.
- Connection sizing: Confirm the inlet connection size matches your existing header pipe. Call us to confirm compatibility with your current system.
- Space: 30" diameter, 84" length -- measure the installation location before ordering. This tank needs clearance on all sides for access to drain and connections.
- Drain maintenance: The tank must be drained regularly -- daily in humid climates. Plan the installation location with drain access and a floor drain nearby.
- ASME inspection: In some jurisdictions, pressure vessels above certain size or pressure thresholds require registration and periodic inspection. Check your local code requirements.
Technical Specifications
- Part Number: ADDER240GALLON
- Tank Models: 240H200 / 240HD200
- Manufacturer: Cast Air (Castair), Minnesota
- Capacity: 240 gallons
- Pressure Rating: 200 PSI
- Certification: ASME coded pressure vessel
- Orientation: Horizontal
- Dimensions: 30" diameter x 84" length
- Top Plate: 17" x 44" or 17" x 85" (specify at order)
- Weight: 700-790 lbs (empty)
- Price: Call for current pricing -- freight on a 700+ lb tank is quote-based
Why Buy From Air Compressor Factory Direct
A 240-gallon tank adder is not an impulse purchase. It requires a conversation about your compressor output, your facility layout, your connection sizes, and your freight situation. Since 2016, we have helped shops size and specify compressed air systems -- from individual accessories to complete multi-compressor installations. We know the Cast Air line and we know how to match the right storage solution to a real shop's real situation.
Freight on a 700-790 lb tank is not standard ground shipping -- call us before ordering and we will give you an accurate freight quote and confirm the correct top plate configuration for your installation. Full manufacturer warranty on Cast Air products. Honest guidance on whether this tank or a different solution fits your situation best.
Call 866-217-0063 for quick answers and help!
