Vent Mist Elimination

The Hilco VME system removes visible oil vapor from the air stream of vents on lubricating oil systems — turbines, generators, compressors, pumps, and engines. It eliminates oil mist from contaminating air or soil and helps facilities comply with RICE NESHAP requirements.

Hilco VME-79E mist eliminator unit Hilco VME mist eliminator — installed on equipment
99.97%
Removal efficiency
0.3 µm
Particle capture
< 3 ppm
Oil carryover
Zero
Visible plume

How the VME system works

Oil mist generated by reciprocating or rotating equipment is drawn from the breather by the blower. The mist passes through coalescing cartridges where it is trapped and gathered into droplets that fall to the bottom of the housing. Clean air — less the captured oil — proceeds through the blower and exhaust silencer and exits the unit. Recovered oil returns to the sump.

Hilco VME system layout diagram — airflow and oil recovery path

VME system layout — oil mist enters at left, coalesced oil returns to sump, clean air exits right

No back pressure on the oil system
Self-regulating bypass maintains atmospheric crankcase conditions
Vapor extractor and mist eliminator in one unit
Explosion-proof and UL/CSA approved
Guaranteed no visible plume
50 Hz / 60 Hz dual-rated motors
Wall mount or roof mount — compact footprint
Tandem configurations for high-flow applications
Direct replacement for Dollinger, Franke, and other OEM units
Clean oil return keeps lube system cleaner over time

Three configurations for different operating conditions

Each configuration uses the same high-efficiency coalescing cartridge technology. The difference is how the system handles airflow and back pressure. Many standard series are stocked and ready to ship.

Most common

Blower-Assisted

For oil systems that cannot withstand back pressure. Can be installed with an airflow-restriction device (butterfly valve) to pull vacuum. Maintains atmospheric conditions in the oil system.

80 CFM max · 2" inlet/outlet · DM639-00-C element
High-temperature

With Heat Exchanger

For applications where oil temperatures exceed 200°F. Cooling the air stream makes the oil mist easier to coalesce, increasing collection efficiency in demanding environments.

Custom CFM ratings · Integrated cooler section
Passive option

Coalescer-Only

Where back pressure on the oil system is not a concern. Can be sized large enough to meet pressure-drop requirements. Also suitable where an existing blower is already present to assist flow.

Scalable sizing · No electrical required

Standard unit specifications

80 CFM Series

80 CFM maximum flow capacity
2" inlet / 2" outlet connections
Carbon steel construction
50/60 Hz electrical requirements
Paint as specified
Mountable inside or outside enclosure
Demister element: DM639-00-C

38 CFM Series

38 CFM maximum flow capacity
2" inlet / 1.5" outlet connections
Carbon steel construction
50/60 Hz electrical requirements
Paint as specified
Mountable inside or outside enclosure
Demister element: DM620-00-C

Measured results

Performance data from field installations confirms 99.97% removal efficiency regardless of particle size or shape.

575 → 0.04
PPM influent → effluent
At 40 engine hours: influent oil content at 575 PPM reduced to 0.04 PPM in the effluent air stream.
1,557 → 0.21
PPM influent → effluent
At 1,000 engine hours with higher blow-by: influent oil content at 1,557 PPM still reduced to 0.21 PPM — sustained efficiency under load.

Where VME systems are installed

VME systems are operating across power generation, compression, and heavy industrial facilities — anywhere oil mist from rotating or reciprocating equipment creates compliance, safety, or maintenance risk.

Power generation

Gas turbines, steam turbines, and diesel/gas engine generator sets. VME units keep turbine halls clean and reduce fire risk from airborne oil mist.

Lube oil reservoir vents
Bearing housing vents
Seal oil systems on hydrogen-cooled generators
Turbine hall oil mist control
Fire risk reduction from airborne oil

Compressors and rotating equipment

Crankcase ventilation on CAT and Waukesha engines at pipeline and gas processing stations. Any application generating oil vapor from bearing or crankcase systems.

Reciprocating compressors — natural gas, hydrogen, process gas
Centrifugal compressors and gear drives
Large industrial pumps
CAT and Waukesha engine crankcase ventilation
Pipeline and gas processing stations
Hilco VME on CAT engine crankcase Hilco VME on GE steam turbine

Need a VME system sized for your equipment?

Tell us the equipment type, vent configuration, and airflow. We'll confirm the right model and element — or walk through options if it's not straightforward.

Request a VME Review ← Back to Hilco Products