The Ingersoll Rand MSG TURBO-AIR NX 12000 is a high-speed, integrally geared centrifugal compressor. The centrifugal impeller is the single most critical rotating component, operating at speeds typically between 15,000 and 30,000+ RPM.
Here is the direct technical and sourcing information you need.
1. OEM Part Number Context
Ingersoll Rand does not sell "bare impellers" over the counter. They are sold as part of a Balance of Rotor (BOR) or High-Speed Shaft Assembly.
Typical OEM P/N format:
IR-XXXXX-XXor399XXXXXThe critical identifier: You need the Stage (1, 2, or 3) and the Compressor Serial Number (S/N) . The NX 12000 is a 3-stage compressor; impellers for Stage 1 (low pressure) are larger diameter than Stage 3 (high pressure).
2. Aftermarket & Repair Sources (OEM-Equivalent)
Since you asked for a "Centrifugal Impeller" specifically, you are likely looking for a replacement or repair. Major authorized and non-authorized suppliers include:
Ingersoll Rand Aftermarket (Direct): Part # likely requires a quote. They will only sell if you provide the unit S/N. They will force a full rotor assembly or certified exchange.
Sulzer (Aftermarket): They manufacture reverse-engineered impellers for the NX 12000 with improved materials (e.g., 17-4PH vs. original Aluminum).
Compressor Engineering Corp. (CECO): A major IR aftermarket competitor. They sell individual impellers for the MSG series.
Atlas Copco / Turblex (Cross-shopping): Occasionally used as replacement parts, but generally not compatible without custom machining.
3. Critical Technical Specifications
If you are sourcing aftermarket, the replacement impeller must match these parameters exactly:
| Parameter | Typical Value for NX 12000 | Why it matters |
|---|---|---|
| Material | Aluminum 7075-T6 (Stage 1/2) or 17-4 PH Stainless (Stage 3/high temp) | If you use aluminum on a high temp stage, it will explode. |
| Yield Strength | >70,000 psi (Al) / >150,000 psi (SS) | Prevents high-cycle fatigue failure. |
| Machining Tolerance | ISO 5 (Grind finish) | Roughness > 16 Ra will kill efficiency by 5-10%. |
| Balance Grade | ISO 1940 G0.4 (or better) | Standard G1.0 is not acceptable for 30k RPM. |
| Natural Frequency | Must avoid harmonics from 0 to 125% operating speed | Aftermarket impellers often fail here. |
4. Immediate Action Plan
To get a price or lead time, you must provide a supplier with the following data from your unit's nameplate:
"Need impeller for IR MSG TURBO-AIR NX 12000. S/N: [YOUR NUMBER]. Stage [1, 2, or 3]. Current wheel damage: [Cracked tip / Bored bore / FOD damage]."
Warning: Do not attempt to weld or re-profile a damaged impeller on this model. The NX 12000 operates at such high tip speeds (approaching Mach 1) that any repair other than a full CNC re-machining will result in catastrophic failure within hours.
