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Tramp Oil2022-11-02T16:03:57+00:00

Tramp Oil Removal using Zebra Skimmers and Coalescers

Tramp oil originates as lubrication oil seeps out from the slide-ways and washes into the coolant mixture, or as the protective film with which the steel supplier coats the bar stock to prevent rusting, or as hydraulic oil leaks. In extreme cases it can be seen as a film or skin on the surface of the coolant or as floating specks of oil. It is considered a a contaminant and a potential pollutant if not dealt with properly.

What is tramp oil?

Tramp oil or sump oil is unwanted oil that has mixed with cutting fluid (also known as coolant, lubricant, or metalworking fluid). It is generated as a byproduct during metalworking operations.

How Skimmers and Coalescers Function

Skimmers are used to separate the oils from the coolant. These are typically slowly rotating disks, tubes or belts that are partially submerged below the coolant level. As these moving parts rotate through the coolant, tramp oils cling to them and passes through a separator or wiper before returning to the coolant sump. Theses wipers also direct the tramp oil to a container where it is collected for disposal.

To remove tramp oils, Zebra Skimmers manufactures disktube, and belt skimmers as well as the Muscle™ coalescer that uses a floating oil skimmer for tramp oil removal from the surface of metalworking coolants.

Zebra skimmers are designed as simple, trouble-free, economic solutions for removing free floating and mechanically dispersed tramp oils from individual machine sumps. Based on gravity flow and coalescence, Zebras disc, tube and belt skimmers can reduce these oils to less than 1% in a single pass.

The full line of skimmers extend the productive life of soluble oil, semi-synthetic and synthetic coolants, as well as the cutting tool. The  Zebra line of skimmers are backed by our standard 90-day warranty and is proudly manufactured in the United States.

Benefits of using Zebra Skimmers:

  • Most Inexpensive Way to Remove Oil from Coolant
  • Reduces Bacterial Growth and Foul Sump Odors
  • Prolongs Coolant Life, Reducing Raw Material Costs
  • Extends Tool Life and Improves Part Quality
  • Prevents Plugging of Spray Heads and Filters
  • Reduces Disposal Costs
  • Minimal Maintenance

Comparison data on skimmers

wdt_ID Tube Skimmers Belt Skimmers Disk Skimmers Z17 Coalescer
1 Tramp Oil Ratings: 1 qt/hr Tramp Oil Ratings: 1" - 1 gallon/hr Tramp Oil Ratings: 1+ gallons/hr Tramp Oil Ratings: 3 gallons/minute
2 max fluid temp 90°F (30°C) max fluid temp poly belt 40-80°F (4-27°C) Stainless Steel belt 60-212°F (15-100°C) max fluid temp standard disk 80°F (27°C) High temp disk 212°F (100C) max fluid temp 90°F (30°C)
3 Use on sumps with limited access Use on sumps with limited access and heavy tramp oil loads Use on sumps with larger access heavy tramp oil loads Use on sumps with very heavy tramp oil loads that require extra filtration


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