Define the measurement
Distinguish inlet pressure from differential pressure across the exchanger. Record tapping points, units and the relevant circuit.
Record the trend
A sudden change and a gradual increase raise different questions. Note concurrent changes in flow rate, temperature and fluid properties.
Share a consistent record
Provide the design pressure drop and operating history to the service team. Pressure drop alone does not identify a fault or justify intervention in a running system.
Prepare for the discussion
- Fluids, composition and relevant material requirements
- Flow rates and inlet/outlet temperatures on both circuits
- Design conditions and allowable pressure drop on each side
- Exact model, nameplate and current technical documents