Over 30 L/h of oil removed.
Longer emulsion service life.
A cold rolling mill used a 1U oil skimmer with a 3 m collector hose to remove a viscous oil-and-grease layer from a pre-separation basin of approximately 1 m². Depending on the thickness of the oil layer, recovery exceeded 30 L/h. The hose covered the whole surface, and emulsion service life increased substantially.
Case background
The rolls used to process steel strip are regularly turned and reground. Because they were not cleaned before machining, the coolant emulsion washed off large quantities of oil and grease, which floated in the pre-separation basin. Earlier trials with suction systems and other skimmers had not produced the required result.
The requirement
To stabilise emulsion quality and extend service life, the viscous oil-and-grease layer had to be removed from the bath surface. Earlier trials with suction systems and several other skimmers had not produced the required result.
The solution: FRIESS 1U oil skimmer
A FRIESS 1U oil skimmer was initially installed temporarily above the basin to treat the large floating surface. Its 3 m collection tube reaches the entire basin surface, and the high-viscosity oil forms a thick layer on the oleophilic tube.
Depending on the oil-layer thickness, the skimmer removes more than 30 litres per hour. The rotating movement of the collection tube draws oil from the whole surface. Earlier systems treated only local areas and soon recovered a mixture with a high emulsion content and little tramp oil.
Results at a glance
- The collection tube reaches the entire surface
- Emulsion service life increased substantially
- Tramp-oil removal exceeded 30 L/h (previously only a drip)
Tramp oil repeatedly building up in your cold rolling emulsion?
Please share your emulsion tank capacity, temperature, circulation flow rate, tramp-oil source and content, and target cleanliness. Our China engineering team can recommend a 1U oil skimmer, collector hose length and installation position suited to your conditions.