- Delta pressure 100 psi or higher
- Unable to flow, maintain pressure above 1 mL/min, 4000 psi
- Alliance 2695
- Empower 2, Empower 3
- Third-party halo column
The third-party column is used in a method that runs up to approximately 3700–4200 psi. Excessive stress is placed on 2695 plunger seals and high-pressure valves.
FIX or WORKAROUND
- Perform PM on the 2695 pumps.
- Rebuild the high-pressure valves if necessary.
The 2695 user manual states a theoretical limit of 5000 psi. With normal running at 3000 psi, more frequent PMs are recommended.