Abrasive Blasting, Shot Peening & Surface Prep calculator
Dust Collector Filter Differential-Pressure Trend Calculator
Project when the filters reach the OEM differential-pressure limit from the measured rise rate and the remaining margin. The projection stays blank with no positive rise, and airflow is checked separately as a stop condition.
What this calculator does
- Project a filter change interval only from a positive measured differential-pressure rise, with airflow checked separately.
Formula used
- DP rise per hour = rise per 100 operating hours ÷ 100
- Remaining DP margin = OEM limit − current differential pressure
- Remaining operating hours = remaining margin ÷ positive rise per hour
- Calendar days = remaining operating hours ÷ operating hours per day
Inputs explained
- Differential-Pressure Rise Rate: Stabilized rise per 100 operating hours from two comparable readings.
- Current Differential Pressure: Latest stabilized reading at a comparable operating condition.
- OEM Differential-Pressure Limit: Manufacturer service limit for this collector and filter.
- Collector Operating Hours per Day: Expected loaded collector runtime per calendar day.
- Current Airflow: Verified exhaust airflow against the approved design basis.
- Minimum Acceptable Airflow: Approved minimum airflow threshold.
How to use the result
- Best suited to maintenance planning, spare filter timing, trend review after a process change.
- A linear trend is not a reliability guarantee. No interval is produced for a flat or falling trend. Airflow, leaks, damage, emissions, fire and exposure concerns can require earlier action.
Common questions
- Why can the result be blank? A flat or falling rise rate cannot support a finite rise-to-limit projection. A blank result is safer than an invented replacement interval.
- Does low differential pressure always mean a healthy filter? No. A leak, damaged filter, open bypass or low airflow can also produce a low reading, so verify airflow and filter condition.
- Can I run until the projected hour? Not automatically. Manufacturer service instructions, airflow, emissions, damage and hazard controls can require earlier action at any time.
- Why include airflow? Ventilation performance is a functional requirement independent of the pressure trend, so it acts as a separate stop condition.
Last reviewed 2026-10-01.