Unstable system backpressure

Issue

How do I troubleshoot unstable system backpressure?

Environment

• Integrion models:
  • 22153-60301
  • 22153-60302
  • 22153-60303
  • 22153-60304
  • 22153-60305
  • 22153-60306

Resolution

Possible Causes and Solutions: 

1. Pump insufficiently primed 

• Prime the pump.

2. Insufficient backpressure on the EG degasser 

• Verify that there is 14 MPa (2000 psi) of backpressure on the EG. Add additional backpressure coils if needed.

3. Pump component problem 

• A worn or damaged pump component can often be identified by a cyclic pattern in pressure readings.
• Replace the pump check valves.
• Replace the pump seals.

4. Unstable column temperature

• Check the temperature setpoint of the column compartment; verify that the temperature is stable.
• Verify that the column is installed correctly on the column clips and the column compartment door is closed completely.

5. Clogged injection valve 

• A clogged injection valve may cause unstable pressure whenever the valve position is switched.
• If the injection valve is the suspected source of the unstable backpressure, the injection valve rotor seal or stator may need to be replaced.