Trailer Mounted High-Pressure Nitrogen Pumper – 800 HP / 10,000 PSIG / 800,000 SCFH Flow Rate

Is this sized for my peak demand or my average?

High-pressure nitrogen pumpers like this are typically sized for peak instantaneous demand, not average consumption, because most oilfield and pipeline applications—well stimulation, hydrotesting, pigging—require sustained high flow at full pressure for the duration of the job. This unit's 800,000 SCFH rating at 10,000 PSIG represents its maximum vaporization and pumping capacity under optimal conditions; actual output will depend on inlet pressure, ambient temperature, pump plunger sizing, engine RPM, and mechanical condition after recommissioning. If your operation requires continuous duty cycles or the vaporizer experiences derating in cold weather, ask the seller for historical runtime data and whether the vaporizer has supplemental heat capability.

What gases can it be put into service with, given what it ran before?

The listing indicates previous cryogenic nitrogen service. Nitrogen is a non-oxidizing, non-flammable inert gas, so this equipment can typically remain in nitrogen service or transition to argon (also inert) without material compatibility concerns, though seals and gaskets should still be verified for the new fluid. Converting to oxygen service from prior nitrogen use is prohibited without complete cleaning, passivation, and recertification to oxygen-clean standards due to combustion risk from residual hydrocarbons. Carbon dioxide service may be possible depending on metallurgy and seal materials, but CO₂'s different thermodynamic properties and potential for dry ice formation require engineering review of the pump's cold-end materials and the vaporizer's heat transfer design.

What are the installation and utility requirements?

This is a self-contained trailer-mounted package with integrated diesel power (Caterpillar C-18 engine), so the primary site requirements are level ground with adequate load-bearing capacity for the trailer (owner documentation references approximately 80,000 GVW class), clear access for cryogenic liquid tanker deliveries to fill the onboard CVA supply vessel, and compliance with local setback and fire code requirements for high-pressure equipment near occupied structures. Operational utilities are minimal—diesel fuel supply for the engine, though consumption rate is not provided in the listing—but you'll need to confirm whether instrumentation and controls require external power, as the listing notes control systems require inspection. Ask the seller for the trailer's actual GVW, axle configuration, and whether air brakes or electrical hookup to a tractor are required for transport, and verify your site can accommodate discharge piping rated for 10,000 PSIG service.

What should I inspect on a used vaporizer before buying?

Prioritize visual inspection of the heat exchanger coil and fins for physical damage, corrosion, or evidence of freeze damage from operating below design limits, as coil replacement typically represents the highest refurbishment cost on ambient vaporizers. Check the vaporizer's ASME code stamp and nameplate data against the listing (the Cryoquip 800K is stated as 10,000 PSIG and 800,000 SCFH rated) and request the last hydrostatic test date and report—ambient vaporizers generally follow a requalification interval per ASME Section VIII, though the specific interval depends on jurisdiction and service. Verify inlet and outlet connection sizes, flange ratings, and pressure relief valve set points match your system design, and closely examine inlet piping and valve seats for erosion or ice damage patterns that suggest past operational upsets. Since the unit is offered as-is with controls requiring inspection, allocate time to test pressure transmitters, temperature sensors, and any automated defrost or control logic if present.