Recommendations For New Piston Seals - Thermo Scientific Vanquish VH-P10 Operating Manual

7.6.6

Recommendations for New Piston Seals

When
Items required
Recommendations
Allow new piston seals to run in.
Never run the pump dry.
Vanquish Pumps (VH-P10) Operating Manual
When new piston seals have been installed
TIP The actions recommended in this section directly influence pump
performance and the piston seal life cycle.
•
Backpressure capillary (from Diagnostics tool kit)
•
Isopropanol
•
Solvent suitable for your application
To run in new piston seals, follow these steps:
1. Purge the pump. For 15 minutes, apply a purge flow of
approximately 1.3 mL/min using isopropanol.
2. Install the backpressure capillary on the pump outlet.
3. For 30 minutes, apply a flow of approximately 1.3 mL/min using
isopropanol to generate a backpressure of approximately 30 MPa.
4. Turn off the pump flow and wait until the system pressure is down
to zero.
5. Remove the backpressure capillary from the pump outlet and
reconnect the pump to the system.
6. Purge the pump using the solvent for your application.
7. If an increased leakage rate is observed with new piston seals after
several hours of operation, operate the pump for at least 2 hours at
35 MPa.
TIP If the piston seals are not sufficiently tight yet, have the pump
build up and hold high pressure for some minutes.
Running the pump dry can damage the pistons or piston seals.
7 • Maintenance and Service
Page 145