Cryogenic equipment
buyer’s guide.

Start with the job, then choose the vessel.

A similar-looking tank can serve a very different purpose. Before comparing used nitrogen equipment or used CO₂ equipment, write down the gas, whether you need liquid or gas at the outlet, the required flow and pressure, and whether the equipment will travel or remain at a site.

• Move bulk liquid between locations: investigate a transport trailer, truck-mounted tank or an appropriate ISO tank container.
• Hold product at a facility: investigate a bulk storage vessel and its supporting delivery equipment.
• Deliver gaseous nitrogen to a process: define the pumping, vaporization and outlet conditions as a system.
• Remove heat from a process: define the cooling duty before shopping for a nitrogen chiller or its liquid supply tank.

Buying equipment? This guide is for buyers evaluating vessels and equipment. It is not a freight-booking service or a quotation for bulk gas delivery. Browse listings for individual specifications and ask our team to confirm availability.

Compare the main equipment types.

Use this table to identify the right category. The checks below are purchasing questions, not a substitute for the unit’s drawings, manuals or engineering review.

Cryogenic transport trailers: compare the complete unit.

Cryogenic transport equipment is designed around a particular liquid-gas service and transport application. Nitrogen, oxygen and argon trailers may look similar, but the intended product and the unit’s documented configuration matter more than appearance. Manufacturer transport ranges include different vessel, chassis and insulation arrangements; CO₂ equipment can use different insulation designs. [1]

Payload and capacity are different comparisons.

Ask whether a capacity figure describes water volume, usable liquid volume or product mass. Compare tare weight, loaded weight and axle arrangement alongside the vessel capacity. A larger tank does not automatically mean more usable payload for your operation.

Look beyond the tank barrel.

Request photographs and condition information for the frame, suspension, brakes, tires, kingpin, landing gear, piping cabinet and transfer connections. Identify whether the offer includes a pump, meter, hoses and drive equipment. A trailer advertised with a capacity figure alone is not a complete unloading-system specification.

For tandem, tridem, lead-and-pup or Super B configurations, have the proposed combination assessed for the intended routes and operating jurisdiction. For an ISO tank, confirm both the vessel details and the frame’s suitability for the intended handling and transport modes. The ISO format itself does not establish that a used unit is ready for your application.

Bulk industrial gas transport: equipment or a hauling service?

“Bulk industrial gas transport” can describe either the movement of industrial gases or the equipment used to do it. If you are building or expanding a fleet, the buying decision is about the vessel, running gear, transfer system and supporting documents. If you need a load moved, you need a transport provider’s service quotation.

For an equipment inquiry, specify the product, loading and unloading locations, expected trip duration, delivery frequency, target payload and the receiving system’s requirements. Ask how the proposed unit fits those conditions instead of choosing on tank volume alone.

Separate the equipment purchase from delivery to your site, import arrangements, inspection work and commissioning. Ask for a written scope identifying what is included, what needs additional work and who will arrange it. That makes quotations for a CO₂ transport trailer, liquid nitrogen tanker or bulk storage package easier to compare.

Bulk storage tanks, CO₂ vessels and storage queens.

A storage vessel provides inventory at a site; the downstream system determines how that inventory reaches the process. A tank supplying liquid to cooling equipment has a different duty from a tank feeding a vaporizer for gas use. Manufacturers offer purpose-designed bulk storage systems for different gases and applications. [2]

Liquid nitrogen storage.

For a used liquid nitrogen tank, request the vessel data plate, capacity basis, pressure and temperature ratings, insulation details, vacuum history where applicable, and service records. Heat entering a cryogenic container causes some liquid to vaporize, so storage performance and consumption pattern should be considered together. [3]

CO₂ storage vessels.

Compare the specified CO₂ service, usable product capacity, pressure rating, insulation arrangement and any refrigeration or pressure-management equipment included in the sale. Ask whether the vessel is intended for permanent installation or mobile storage. The commercial term “storage queen” should prompt a discussion about its actual configuration and documentation, rather than an assumption about transport capability.

Oxygen and argon equipment.

Confirm documented product service and cleanliness requirements with the manufacturer and a qualified specialist. Do not assume that equipment previously used for one gas can be put into another service without assessment. Oxygen service brings specific compatibility and cleanliness considerations. [6]

Before selecting a location, ask your installation team to review foundations, access for filling and maintenance, unloading arrangements and the complete supply-system design.

What is a nitrogen chiller?

A nitrogen chiller is a broad description, so first establish what the seller means. Liquid-nitrogen cooling systems use nitrogen’s cooling capacity to remove heat. Direct cooling brings nitrogen into contact with the process; for example, Linde’s DCOOL system converts liquid nitrogen to cold gas before injecting it into the reactor contents. Indirect cooling keeps the nitrogen separate from the process, such as by cooling a heat-transfer fluid through a heat exchanger. [4]

A liquid nitrogen storage tank is the supply vessel, not a complete chiller. A nitrogen generator is also a different equipment category: generating nitrogen gas does not by itself provide a liquid-nitrogen cooling system. Ask for a system diagram showing exactly what the offer includes.

Specifications to request for nitrogen cooling equipment.

• Cooling duty: heat removal in kW or BTU/h at your stated operating conditions, plus batch size or production throughput.
• Temperature: starting and target temperatures, pull-down time and required control tolerance.
• Cooling method: direct contact or indirect heat exchange, with process-material compatibility confirmed.
• Supply requirements: liquid nitrogen consumption, inlet pressure, supply connections and storage requirements.
• Package scope: heat exchanger, control valves, sensors, controls, piping and any heat-transfer-fluid circuit.
• Installation: utility requirements, exhaust arrangements and the ventilation and monitoring assessment for the site.

Compare operating cost using the expected duty cycle, delivered nitrogen consumption, maintenance and installation scope. A low purchase price alone does not establish a low cost per production batch. This guide explains the category; it does not imply that a nitrogen chiller is currently listed.

Nitrogen pumpers, cryogenic pumps and vaporizers.

Nitrogen pumpers.

When evaluating a used nitrogen pumping unit, request performance at the required discharge pressure and outlet temperature. A headline flow rating is incomplete without its test conditions. Confirm the pump, vaporizer, engine or hydraulic drive, controls and storage components included in the package. Review service history for the pumping system separately from chassis mileage or engine hours.

Liquid transfer pumps and motors.

Identify the pump model, intended fluid, inlet conditions, flow curve and differential pressure. Then confirm drive speed, motor power, electrical supply or hydraulic requirements and connection sizes. CO₂ transfer has its own pump-design considerations; Blackmer identifies liquid CO₂ as a demanding, non-lubricating service. Do not select a pump solely by port diameter. [7]

Product vaporizers versus pressure-building coils.

A product vaporizer converts liquid into gas for downstream use. A pressure-building vaporizer serves the tank’s pressure-maintenance circuit. They are not interchangeable simply because both vaporize liquid. Ambient vaporizers use surrounding air as their heat source; rated output must be evaluated against the actual operating conditions. [5]

Ask for the duty, flow rating and reference conditions, pressure rating, heat source, outlet temperature and continuous or intermittent service limits. For outdoor equipment in Alberta, discuss winter operation and defrost requirements with the equipment supplier.

Specifications that make quotations comparable.

Capacity and units

Record litres, US gallons, Imperial gallons, kilograms or pounds exactly as stated. Ask for clarification when a listing says only “gallons” or uses an unfamiliar abbreviation. Vessel volume and product mass cannot be compared as the same quantity.

MAWP and temperature rating

MAWP means maximum allowable working pressure and must be read with its associated temperature rating. It is not a recommended operating setpoint. Request the nameplate, manufacturer’s data report and any later re-rating or inspection records; the complete system’s permitted operating conditions need separate review. [8]

Flow and reference conditions

Separate liquid flow from gas flow. For SCFH or Nm³/h, ask which standard temperature and pressure were used. Compare pump or vaporizer output at the required duty, not just a model’s headline maximum.

Insulation and holding performance

Request the insulation type, vacuum-test history where applicable, and any evaporation or holding-performance records with their test conditions. A fresh outer finish does not demonstrate insulation performance.

Identity and documentation

Match the manufacturer, serial number, year and data plate to the supplied records. For a truck-mounted package, identify the tank, truck and pumping-system years separately.

Condition and sale scope

Clarify as-is versus refurbished condition, completed work, outstanding repairs, included accessories, warranty terms if offered, and what evidence supports each claim.

General reference material cannot establish a used unit’s rating or condition. Use the actual vessel documentation and a qualified assessment to resolve missing, inconsistent or unclear specifications.

A practical used-equipment buying checklist.

1. Write a duty brief. Include product, liquid or gas outlet, capacity, flow, pressure, temperature, location, duty cycle and target delivery date.
2. Request the evidence pack. Ask for clear data-plate photos, drawings, manuals, maintenance history, inspection records and details of repairs or alterations.
3. Arrange an independent condition review. Have a qualified person inspect the vessel, fittings, insulation, supports and relevant running gear. Agree on any further examination before purchase.
4. Confirm suitability for the destination. Have the responsible specialist identify the applicable installation, pressure-equipment and transport requirements for the specific unit and location.
5. Price the complete project. Include loading, freight, duties or taxes where applicable, site work, missing components, inspection, refurbishment and commissioning.
6. Document the purchase scope. Confirm equipment identity, included parts, condition, payment terms, collection arrangements and any agreed acceptance criteria in writing.

Cryogenic systems involve very low temperatures, pressure and gas-specific hazards. Have qualified personnel assess installation and operation using the equipment manual and product safety information. This guide is a purchasing aid, not an operating or conversion procedure. [6]

Questions buyers ask.