DIY Scavenge Line Cleaning for Ingersoll Rand P100–P185 Models
Oil Carryover? It Might Just Be a Dirty Scavenge Line
Seeing oil carryover? Before you replace your separator element, there’s one maintenance step you should always knock out first—cleaning the scavenge line. This quick guide walks you through the process for Ingersoll Rand models P100-WDJU, P125-WJDU, P160-WJDU, P175-WJDU, and P185-WJDU.
Why the Scavenge Line Matters
The scavenge line runs from the receiver-separator tank cover to the compressor air end through a small orifice. Its job? Returning separated oil back to the compressor. If this line gets clogged, it can cause excessive oil carryover and lead to unnecessary part replacements—like a brand new separator element you might not actually need.
Recommended Service Interval
Clean the scavenge line once a year or every 1,000 hours of operation, whichever comes first.
Steps to Clean the Scavenge Line
- Shut down the unit and follow all lockout/tagout safety procedures.
- Locate the scavenge line—it originates at the separator tank cover and terminates at the compressor air end through an orifice.
- Remove the line and inspect it thoroughly for any sludge or debris buildup.
- Clean the scavenge line, any orifice, and the check valve completely. You can use solvent or compressed air—just make sure the parts are dry before reassembly.
- Reinstall the scavenge line and confirm that all fittings are tight and properly sealed.
Important Note About Separator Elements
Excessive oil carryover might seem like a separator issue—but don’t replace the element until you’ve completed this scavenge line maintenance. Here’s the full recommended procedure:
- Check and maintain proper oil level.
- Thoroughly clean the scavenge line, any orifice, and the check valve.
- Assume the minimum pressure valve (if equipped) is set properly.
- Run the unit at rated operating pressure for 30 to 40 minutes to give the separator a chance to clear itself.
Wrap-Up
Keeping the scavenge line clean not only helps prevent oil carryover, but also extends the life of your separator element and compressor system overall. It’s quick, easy, and way cheaper than replacing parts unnecessarily.