Cryostar PD-3000 Dual Pump Skid — 3 GPM Cryogenic Pump

What flow and head is this rated for, and at what NPSH?

This unit is rated for 3 GPM flow. Head and NPSH requirements are not specified in the listing; ask the seller for the pump curve or nameplate data showing discharge pressure at rated flow and minimum NPSH required. Cryogenic pumps typically require very low NPSH due to the density and saturation characteristics of LOX, LIN, and LAR, often 5–15 feet, but you need the specific curve for this model to size your system correctly.

What service has it been in, and what were the running hours?

The listing states the unit is designed for LOX, LIN, and LAR cryogenic service but does not specify which fluid it actually ran or the operating hours accumulated. Ask the seller for service history records, which fluid(s) were pumped, and total run time or cycles—this affects seal wear, bearing condition, and whether any oxygen cleaning or material compatibility concerns exist for your intended use.

What seals, materials and drive does it have?

This unit is configured with a 1-Wax seal. The listing does not specify wetted materials, motor type, horsepower, or voltage. On cryogenic pumps, wetted materials are typically 316 or 316L stainless for compatibility with LOX/LIN/LAR, and drives are usually TEFC or explosion-proof motors sized to handle the density and viscosity of the cryogen—ask the seller for the motor nameplate and materials of construction documentation.

What should I inspect on a used pump before buying?

The listing notes the unit has been inspected but not fully tested, so request documentation of that inspection and ask about any performance testing planned before shipment. Physically inspect the pump shaft for play or scoring, verify seal condition and verify no corrosion or frost damage on the cold box or vacuum jacket if present. On dual-pump skids, check both pumps, all valving, relief devices, and the control panel or instrumentation for completeness—cryogenic seals and bearings degrade with thermal cycling even when idle, so verify the unit can be run under load or negotiate access for witness testing.