ACD 50mm Complete Pump Skid — 75 HP 460V LNG/LOX/LIN/LAR

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

The listing states the unit is configured for LOX, LIN, LAR, and LNG service but does not specify which product it actually ran or for how many hours. The seller notes the skid has been inspected but not fully commissioned, which suggests it may have seen limited or no operational service. Ask the seller for service history, product exposure, and actual run time to assess wear and contamination risk.

What seals, materials and drive does it have?

The unit has a 75 HP 460V motor drive and uses a 2-SGV configuration, but the listing does not specify seal type or wetted materials. Cryogenic pumps in multi-product service typically use mechanical seals with face materials compatible with oxygen service (often carbon against tungsten carbide or silicon carbide) and 316/316L stainless construction, but you should confirm the actual seal design, materials of construction, and whether oxygen cleaning has been maintained if LOX service is intended.

What should I inspect on a used pump before buying?

Request documentation of the last inspection findings and check the motor for bearing condition, winding insulation resistance, and whether it's been rewound. On the pump itself, verify shaft runout, impeller-to-casing clearances, and inspect the mechanical seal faces for scoring or flat spots—cryogenic seals are expensive and damage from a thermal shock or dry run is common on skids that sat idle. Since this unit is offered as-is and not fully commissioned, arrange for a witnessed rotation test and verify all instrumentation, relief valves, and the vaporizer coil (if equipped) are intact.