Quench Oil Filtration Centrifuge | Self-Cleaning Design

Quench Oil Centrifuge

Quench Oil Centrifuge

A quench oil centrifuge is an efficient way to filter out the sludge from quenching oil continuously. The centrifuge can remove contaminant particles down to 0.5 microns while exerting over 7000 from the quenching oil. And with its self-cleaning design, the centrifuge is fully-automatic, requiring minimal labor compared to filtration.

The Function of Quench Oil or Heat-treatment Oil

Time-bound or quick cooling of metals changes the base metal’s grain structure, enhancing its physical properties. This process of rapidly cooling metals is known as quenching.

The quenching process involves pre-heating the metal component to high enough temperature to allow its recrystallization. The heated part is then immersed in a medium of choice based on the desired end properties.

The cooling medium is often a heat-treating oil, also known as quench oil. The use of this medium enhances the quenching process and protects the parts from oxidation.

Contamination and its Effect on Quench Oil

Quench oil accumulates the carbon, rust, scales from the immersion of heated parts. Additionally, oxidation by-products also degrade the quench oil over time.

These contaminants reduce the oil’s effectiveness, resulting in uneven heat treatment, leading to quality issues.

This accumulated sludge also clogs up filtration systems and heat exchangers used to cool the quench oil.

Quench Oil Centrifuge Operation

A quench oil centrifuge from Dolphin Centrifuge is a disc-stack centrifuge. These centrifuges exert over 7,000 G-force on the process liquid. In the case of quench oil, this centrifugal force is sufficient to remove all the sludge particles from the oil.

Additionally, the centrifuge’s automatic, self-cleaning ability means that the centrifuge can work continuously and independently. This advantage eliminates any labor requirement, which filtration requires.

A system integrated pump feeds the contaminated quench oil into the centrifuge bowl. Inside the centrifuge bowl, the quench oil experiences high centrifugal forces. This force pushes out the heavier sludge particles towards the bowl wall where it accumulates.

The clarified quench oil pushed towards the center of the bowl and out through the clean oil chamber at the bowl top. A centripetal impeller builtin to the bowl pumps out the clean oil back to the quenching oil reservoir.

Filters can only do so much on quench oil. If you use too fine a filter, the media cost and labor multiply due to the increased filter change frequency. If you use a coarse filter, the quench oil retains its contaminants.

Benefits of Quench Oil Centrifuge

Clean quench oil has many advantages which are familiar to the heat-treating companies. Some of these benefits of centrifuging quench oil are listed below.

Features and Benefits:

  • Eliminates or reduces filtration.
  • Cost savings based on reduced quench oil replacement.
  • Reduced used oil disposal costs.
  • Better heat-treatment of components with consistent grain structure.
  • Labor saved on post-heat-treatment job cleaning and machining operations.
  • Enhanced durability of pumps and other process components.
  • Eliminate heat-exchanger clogging.
  • Quench Oil tanks do not accumulate sludge, which requires cleaning.


A quench oil centrifuge offers considerable benefits to the heat-treatment industry. Based on case studies conducted by Dolphin Centrifuge, a typical payback period of a centrifuge system is less than 3~6 months considering the costs mentioned above. Additionally, improved product quality and equipment durability are collateral benefits.

Contact Dolphin Centrifuge for additional information or to get a price quote. 

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Self Cleaning æ Disc Stack Centrifuge

Technical Specs
Capacity: 10 GPM on Quench Oil
Motor HP: 5 HP
Voltages: 230V / 460V
Skid Dim.: ~ 5′ x 5′
Skid Wt.: ~ 1,800 lbs
Alfa Laval Quenching Oil Filtration Centrifuge

Alfa Laval WHPX405 Centrifuge

Self-Cleaning æ Disc Stack Centrifuge

Technical Specs
Capacity: 10 GPM on Quench Oil
Motor HP: 5 HP
Voltages: 230V / 460V
Skid Dim.: 5′ x 5′
Skid Wt.: ~ 2,000 lbs
Alfa Laval MOPX213 Quenching Oil Centrifuge Package

Alfa Laval MOPX213 Centrifuge

Manual-Cleaning æ Disc Stack Centrifuge

Technical Specs
Capacity: 40 GPM on Quench Oil
Motor HP: 15 HP
Voltages: 230V / 460V
Skid Dim.: 6′ x 6′
Skid Wt.: ~ 4,000 lbs