Silo Dust Collector Pressure Drop Troubleshooting Guide

What Differential Pressure Means

The measurement compares pressure on the dirty-air and clean-air sides. Resistance rises as dust loads the media and should fall to a repeatable level after effective pulse cleaning.

Absolute values differ by media and duty. A trend recorded under similar filling conditions is more informative than copying an alarm value from another collector.

High Pressure Drop

• Pulse controller disabled or incorrect sequence
• Low dynamic compressed-air pressure
• Failed valve diaphragm or blocked nozzle
• Wet, oily or hardened filter cake
• Airflow above design
• Undersized area or blinded media
• Blocked clean-air outlet

Low Pressure Drop With Dust Emissions

Suspect a torn element, failed seal, missing filter, open bypass, disconnected impulse tube or incorrect transmitter range. Inspect the clean chamber before disturbing the dirty side so leakage evidence remains visible.

Low resistance without visible emissions may simply mean low airflow or a recently changed filter set; verify operating conditions.

A Logical Test Sequence

Zero the instrument with both ports at equal pressure, inspect tubing and confirm port orientation. Record readings with the process off, during filling and after cleaning. Then check fan or conveying airflow, pulse-system pressure and filter condition.

Change one setting at a time and document the result. Randomly increasing pulse duration can hide the cause and waste air.