Troubleshooting
Pressure and flow troubleshooting: identify the pattern first
Use upstream and downstream pressure, flow, temperature and time trends to narrow the cause before changing a filter.
On this page
Check the measurement boundary
High inlet pressure alone does not prove a blocked filter. If outlet pressure rises similarly, downstream resistance or system backpressure may be involved. Identify the pressure taps and units, and account for elevation where relevant. Establish that the readings are valid before interpreting filter performance.
- Confirm taps bracket the intended filter rather than additional valves.
- Check gauge versus absolute pressure, units and calibration status.
Investigate an abnormal starting point
High pressure drop immediately after installation calls for checks of configuration, direction, valves, temperature, viscosity, wetting and venting. Compare with a clean baseline at the same fluid and flow. A water baseline cannot be transferred directly to a more viscous process liquid.
- Compare stable initial readings with the approved configuration baseline.
- Record changes in connection, area or fluid temperature during changeout.
Interpret the rate and direction of change
A gradual rise at constant flow may reflect retained material or changing fluid properties. A step change suggests investigating valves, gas entry, feed events or instrumentation. A sudden decrease is not automatic evidence of recovery; examine flow changes, bypass, sealing and downstream quality.
- Mark feed changes, additions, stops and valve actions on the trend.
- Align downstream quality observations with pressure events.
Act on defined stopping criteria
Use the approved shutdown and material-assessment process when a stopping criterion or quality deviation occurs. Retain the removed filter identity and operating record to support investigation. Document the cause and corrective action before judging whether the next batch represents a real improvement.
- Consider differential pressure, minimum flow, quality and permitted service history together.
- Record the stop reason and comparable post-changeout performance.
Common technical questions
Does low differential pressure prove there is no blockage?
No. Lower flow can also reduce pressure drop; assess flow and system state together.
What if the same issue remains after replacement?
Review fluid, system, instrument and operating changes before repeatedly replacing filters.
Related product approaches
Check materials, configuration and validation documents for the specific model.