TRG Supply offers a selection of fiberglass holding tanks built for durability, chemical resistance, and reliable long-term performance. These tanks are used across industrial, commercial, and municipal applications where safe storage of liquids, wastewater, or sewage is critical.
Every tank is designed and supplied to meet project-specific requirements, including volume, installation environment, and regulatory standards.
TRG Supply is a custom vessel manufacturer, not an information library. We fabricate air receiver tanks, boiler blowdown tanks, vacuum tanks, and general-purpose holding tanks for facilities that need a pressure vessel built to a defined duty rather than pulled off a shelf. Every unit is supplied in accordance with ASME Section VIII, with CRN registration available for Canadian jurisdictions.
The vessels on this page support compressed air systems, boiler rooms, and process plants. Wet and dry air receivers stabilize compressed air supply. Boiler blowdown tanks cool and depressurize high-temperature discharge before it reaches a drain. Vacuum tanks hold negative-pressure service for collection and process duty. Buffer and surge vessels absorb demand swings in batch and continuous operations.
Plant managers, boiler operators, compressed air system designers, and procurement teams use TRG Supply when capacity, pressure rating, orientation, nozzle layout, or material need to match an existing system. We coordinate carbon steel, stainless steel, and specialty-alloy construction, vertical or horizontal configurations, and documentation packages suited to your inspection and code requirements. Browse our full pressure vessel range or request a quote for a specific vessel below.
Holding and pressure vessels are used across several industrial systems depending on function and operating conditions.
Air receiver tanks (compressed air systems)
Boiler blowdown tanks (steam and boiler discharge systems)
Vacuum tanks (negative-pressure applications)
General holding tanks (process storage between stages)
Buffer tanks (flow and pressure surge stabilization)
An air receiver tank is a pressure vessel that stores compressed air downstream of the compressor so the system has a reserve volume to draw from. Without stored air, the compressor responds to every demand change directly, which drives short-cycling, pressure swings, and premature wear.
The receiver buffers demand. When a tool, valve, or process pulls a sudden volume of air, the tank supplies it from storage instead of forcing the compressor to spike output. That smooths delivery pressure to the plant and keeps end-use equipment running within its design window.
Stored volume also stabilizes compressor control. A larger reserve lengthens the time between load and unload cycles, which reduces motor starts on fixed-speed units and steadies operation on variable-speed systems. Fewer cycles means lower electrical and maintenance cost over the life of the compressor.
A compressed air receiver also helps manage moisture. As hot, saturated air sits in the tank and cools, condensate drops out and collects at the bottom, where a drain removes it before the air reaches downstream filtration and drying. That protects desiccant beds and reduces water carryover into the system. For drying equipment that pairs with a receiver, see our desiccant dryer pressure vessels.
Most compressed air systems use a wet receiver, a dry receiver, or both. The placement relative to the dryer is what separates them, and that placement changes what each tank does.
A wet air receiver is installed between the compressor and the dryer and stores air that still contains moisture. Its primary function is to help smooth compressor output and allow bulk condensate to drop out before the air reaches downstream treatment equipment.
This configuration is used to reduce moisture load on dryers and protect filtration systems from excessive water carryover.
A dry air receiver is installed after the dryer and stores clean, treated air close to the point of use. It provides reserve capacity for sudden demand changes and helps maintain stable delivery pressure across the plant. Many systems use both wet and dry receivers to balance moisture control with demand stability.
Sizing an air receiver is based on system demand rather than a fixed standard size. The correct volume depends on how air is consumed and how stable the pressure must remain during operation.
Key factors include:
Because these factors interact with overall system design, receiver sizing is typically matched to flow, pressure, and duty cycle rather than a generic rule of thumb.
A boiler blowdown tank receives high-temperature, pressurized water discharged from a boiler during blowdown operations. Its function is to safely reduce pressure and temperature before the water can be released into a drain system.
As the discharge enters the tank, a portion of the water flashes into steam due to the sudden pressure drop. The tank is designed to separate and vent this flash steam while retaining the remaining water for controlled cooling and safe disposal, often with the addition of tempering water.
This process prevents thermal shock to drain systems, reduces safety risks in boiler rooms, and ensures discharge conditions remain within acceptable limits.
Boiler blowdown tanks must be designed for high-temperature and high-pressure service conditions. Proper venting is required to safely release flash steam and prevent pressure buildup inside the vessel.
Key safety considerations include:
Each installation must be matched to specific boiler operating conditions and local discharge regulations to ensure safe and compliant operation.
A vacuum tank operates under negative pressure rather than positive pressure, holding a reservoir of vacuum for collection systems, process operations, and storage that requires sub-atmospheric conditions. Common duties include vacuum receivers in conveying and collection systems, surge volume for vacuum pumps, and holding capacity in process lines that run under vacuum.
The design priority differs from a pressure vessel. A pressure tank is built to resist forces pushing outward; a vacuum tank has to resist external atmospheric pressure pushing inward, which can collapse a shell that was only designed for internal pressure. That external-pressure condition governs wall thickness, stiffening rings, and head design, and it has to be specified up front.
Because of that, vacuum service has to be stated clearly when the vessel is ordered, including full vacuum or a partial range, so the tank is built for the correct external-pressure rating. TRG Supply fabricates vacuum tanks to ASME requirements for external pressure, in the capacity, orientation, and connection layout your system needs.
Beyond air and blowdown service, many plants need a general holding tank or buffer tank to hold process fluid and smooth out flow between stages. These vessels give a system the working volume it needs to run steadily.
A holding tank stores process fluid between operations, giving you reserve capacity so upstream and downstream equipment do not have to run in lockstep. A buffer tank adds surge capacity, absorbing flow and pressure swings so pumps, valves, and controls see a steadier condition. In batch processing, a holding vessel stages material between steps and decouples one stage from the next, which keeps throughput consistent. Each can be supplied in carbon steel, stainless steel, or specialty alloy to suit the fluid and operating conditions.
Used to stabilize pressure and reduce compressor cycling using wet and dry air receivers in industrial air networks.
Provides a steady compressed air supply for tools, pneumatic equipment, and automated production lines.
Supports safe handling of high-temperature discharge through boiler blowdown tanks with controlled cooling and venting.
Acts as buffer and staging storage between process steps to maintain consistent flow and throughput.
Helps balance fluctuating demand by providing reserve storage and surge capacity across plant utilities.
Used for holding, buffering, and flow stabilization in treatment and distribution processes.
Supports collection, conveying, and process operations that require controlled sub-atmospheric pressure.
Custom vessel fabrication built to your capacity, pressure, orientation, and connection requirements
ASME-certified construction to Section VIII, with U-stamp and National Board registration where required
Industry experience across compressed air, boiler room, process, and utility applications
Documentation support with material certs, inspection records, and test reports for code approval
Project support from specification through fabrication and supply
Quality assurance, including hydrostatic testing and weld inspection, before delivery
An air receiver tank is a pressure vessel that stores compressed air downstream of the compressor. It gives the system a reserve volume that buffers sudden demand, stabilizes delivery pressure, reduces compressor cycling, and lets condensate drop out before the air reaches drying and filtration.
It depends on your air demand profile, the size and frequency of peak draws, your compressor type, and how tight your allowable pressure band is. Systems with large intermittent demand need more storage than steady loads. Share your flow, pressure, and duty cycle and we will recommend a receiver sized to your system rather than a generic figure.
A wet air receiver sits before the dryer and handles air that still carries moisture, dropping out bulk condensate and dampening compressor pulses. A dry air receiver sits after the dryer and stores clean, dried air close to demand for pressure stability. Many systems use both.
A boiler blowdown tank receives the hot, pressurized water discharged during boiler blowdown and reduces its temperature and pressure to safe levels. It separates and vents the flash steam that forms as pressure drops, then holds and tempers the remaining water so it can safely reach a drain.
High-temperature boiler blowdown generally cannot discharge directly to a drain, so a blowdown tank is used to cool, depressurize, and temper the effluent to meet local discharge limits. Requirements vary by jurisdiction. We supply tanks built to ASME Section VIII with documentation to support code approval; confirm your local rules with the authority having jurisdiction.
A vacuum tank holds negative-pressure service for collection systems, vacuum conveying, surge volume for vacuum pumps, and process operations that run under vacuum. Because it resists external atmospheric pressure pushing inward, it must be designed for the external-pressure rating you specify.
Yes. TRG Supply fabricates air receiver tanks to ASME Section VIII, Division 1. Vessels requiring certification carry the ASME U-stamp and are registered with the National Board, with CRN registration available for Canadian jurisdictions.
Yes. We configure capacity, pressure rating, vertical or horizontal orientation, material, and nozzle and connection layout to match your installation, so the vessel fits your floor space and piping without rework.
Holding and buffer tanks are used in manufacturing, industrial processing, utility systems, water treatment, and process plants, anywhere a system needs working volume, surge capacity, or staging between process stages.
Contact us for more information on our products and how they can fulfill your manufacturing or sterilization needs. You may also ask us about our policies, ordering and delivery process, or for other related information.
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