Lassen High Vacuum, Inc. follows industry-standard best practices and exacting standards for every cryogenic pump and compressor rebuild. We back our rebuilds with a one (1) year warranty.
- Standard Lead-Time: Ten (10) Business Days.
- Expedited Lead-Time and On-Site Rebuild Services Available for Additional Cost.
Our rebuilding process is as follows:
- Receiving and Evaluation
- Pump, Compressor and/or any associated components are photographed.
- Any damaged or missing components are noted.
- Note: Customer is required to provide details on any contamination that may be present in the pump and/or any associated components.
- All items received are logged into the Lassen tracking system for trace-ability throughout the rebuild process.
- Customer is contacted to advise of any damage or missing components that could add to the standard rebuild cost.
- Disassembly
- All rebuild-able items are dis-assembled to the major component level.
- Components are inspected and all critical tolerances are measured.
- Second-Stage 15k Charcoal Condensing Array is discarded.
- Failure analysis report generated.
- Reconditioning
- All items are ultrasonically cleaned.
- Decontamination procedures are performed as needed.
- Radiation Pot is media blasted and repainted with low emissivity paint.
- Frontal (first-stage) array is re-plated with electroless nickel.
- New 15 Kelvin charcoal condensing array is installed.
- On-board roughing valve assembly is refreshed as needed.
- Other on-board modules are refreshed as needed.
- Reassembly
- All items re-assembled per original manufacturers specifications.
- Test
- Cool-down test (time vs. temperature) is performed. Performance results verified.
- Motor vibration test.
- Vacuum vessel leak checked with helium leak detector.
- Hour meter is reset to zero (0) for on-board pumps.
- Packaging and Shipment
- Lassen rebuild identification tag applied to rebuilt item(s).
- Item(s) are bagged and prepared for shipment.
Rebuild Process Summary
| Vacuum Side | Helium Circuit |
|---|---|
| Disassemble and clean parts to be reused. | Replace all elastomers and all components subject to wear. |
| Replace 15K condensing array with new assembly. | Inspect 2nd stage displacer regenerator material and repack or replace as necessary. |
| Replace 80K condensing array and 80K radiation shield if needed. | Inspect all parts for damage. |
| Inspect and test silicon diode. Diode is repaired or replaced if required. | Set intake/exhaust valve timing and test inlet valve for perfect seal. |
| Reassemble in clean room conditions using new indium gasket set. | Test motor for appropriate torque and re-magnetize motor. |
| Upgrade to new style relief valve and install "standpipe" filter. | Leak check using helium sniffing leak detector. |
| Leak check with helium mass spectrometer leak detector. | Perform cool-down test and verify performance. |