SES320-600C Insulating Oil Purifier

This compact, mobile 600 GPH system prepares mineral and ester-based insulating fluids for transformer service

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This compact, mobile insulating oil conditioning system is designed for single pass conditioning of new and in service (Group I & II) insulating fluids, increasing voltage values (dielectric strength) by removing dissolved water, dissolved gas, and solid matter contamination. The SES320-600C includes vacuum dry out capabilities and can be used to vacuum filling. 

SES320-600C Highlights

Condition Mineral & Natural Ester Fluids

Single Pass Processing

10GPM/600GPH/2280 LPH

64 Kw Electric Heating

450 Cfm Vacuum System

Transformer Evacuation


More Specifications

SES320 600 Trailer

Efficient Oil & Transformer Processing
The SES320-600C was engineered to provide a convenient, mid-sized oil conditioning package.
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Easy to Tow and Position

The SES320-600C cargo trailer-mounted package is small and light enough to be easily towed, yet large enough to store hoses, supplies and add-on accessories.

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Easy to Operate and Maintain

Automatic temperature, level, foam, and re-circulation control provide trouble-free, simple operation. Routine maintenance is simple with open clear access to all critical components.

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Small but Powerful

The mobile SES320-600C is targeted for small to medium size projects but has sufficient flow rate and heat and vacuum capacity to tackle large projects if necessary.

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Complete Package

The SES320-600C combines high efficient oil processing and plenty of heating and vacuum capacity to perform a full spectrum transformer service tasks including evacuation and single pass vacuum filling.

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Rugged Construction

Low speed direct drive oil pumps, direct drive booster pumps, carbon steel welded oil piping, stainless steel degas chamber and vacuum piping are just some of the features that insure many years of demanding mobile duty service.

Simple Operation

The SES320 oil flow circuit features simple, single valve operation. Adjusting the flow rate is as simple as restricting the discharge valve. The discharge pressure is always constant, but also adjustable, if necessary, to meet demanding applications.


Automatic functions like level control and internal re-circulation eliminate the tedious adjustments required by many competitor’s systems. Oil circulation rate is electronically panel adjustable, a feature not normally standard in a 600 GPH system.


After the job is complete, packing up is a breeze with the SES320 standard inlet and discharge “hose suck” feature.

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Superior Trailer Layout
The layout arrangement of the SES320-600C utilizes a convenient center aisle design. This not only provides space for operation, maintenance, and storage but also balances trailer weight distribution and center of gravity for better towing.
Fail-Safe User-Friendly Controls

The SES320-600C electrical system features fail-safe operator-friendly controls, IEC rated components,100% circuit breaker protection, and includes a complete complement of high-power instrumentation. System and vacuum pump hour meters are also standard!

Complete Instrumentation Package Available

Accuracy: Flow Rate & Totaling Meters


Control: Digital PID Temperture Controllers


Gauges: Local Pressure & Temperature Gauges Where You Need Them


Vacuum: Convection Full-Scale Digital Vacuum Gauges


Oil Quality: In-Line Moisture Monitors


Evacuation: In-Line Vacuum Line Dew Point Monitors


Oil Cleanliness: In-Line Contamination Monitors


Data Logging: Optional Process Data Logging


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Mineral OilNatural Ester Fluids

Processing Rate

10 GPM / 600 GPH / 2280 LPH

De-rate processing rate and heating capacity by 25%

Dielectric Strength

(2 mm gap)

>65 kV

>60 kV

Moisture Content
Single pass


100 ppm reduced to < 10 ppm
50 ppm reduced to < 5 ppm

200 ppm reduced to < 30 ppm

Moisture Content
3 Passes


100 ppm reduced to < 2 ppm 200 ppm reduced to < 20 ppm

Total Gas Content
Single Pass

Saturation reduced to < 0.25%

Saturation reduced to < 0.25%

Total Gas Content
3 Passes
Saturation reduced to < 0.15% Saturation reduced to < 0.15%

Particulate Content

99.9% > 1 micron
97.8% > 1/2 micron

99.8% > 1 micron

Processing Temperature

Min 120F° / 49C°
Max Limit 190F° / 88C°

Min 170F° / 76C°
Max Limit 190F° / 88C°

Processing Vacuum Level

1.5 torr – 0.3 torr

1.5 torr – 0.3 torr


Typically built to order, the SES320-600C and can be customized to any requirement 

Standard Flow Circuit

  • Automatic internal recirculation – no valves to adjust
  • Automation degas chamber level control
  • Discharge pressure is automatically controlled and adjustable to 80 psi
  • Discharge adjustable from 0 – 100% of circulation rate
  • Built in hose suck back and drain capability

Oil Pumping System

  • Two pump systems. Inlet pump standard
  • Direct mount low speed positive displacement screw pumps
  • Viton mechanical seals
  • External relief valves

Electric Heating Systems

  • Low watt density heating does not degrade oil
  • (2) 32 Kw heater banks
  • Heater banks can be disabled at the control panel to reduce amperage requirement if necessary
  • Digital PID individual bank control scheme provides smooth accurate generator friendly operation
  • Oil flow and over temperature safety interlocks provided

Filtration System

  • Coarse inlet pump strainer provided
  • Dual ASME code filter housings provide two stage particulate filtration. 3 & 0.5 micron
  • Pleated synthetic media.
  • 99.8% efficiency
  • Local dirty filter gauges standard
  • Automatic air bleed standard

Degasification System

  • Three stage dispersal system
  • Single pass performance
  • 316 SS chamber shell and interior components
  • Automatic non-pilot operated level control system
  • Primary dispersing system
  • Transparent chamber cover on system 
  • Safety high level overflow shutdown interlock switch
  • Low level warning switch
  • Fiber optic foam control system
  • Automatic vent

Vacuum System

  • Two stage system
  • System capacity is sized at 0.5 torr for 1.25X the maximum oil conditioning vapor load.
  • Vacuum system blank off pressure is < 0.05 torr
  • Vacuum systems can be isolated for dedicated transformer evacuation
  • 304SS vacuum system piping
  • Vacuum booster pump inlet safety oil trap w/ shutdown interlock is provided.

Protects vacuum booster pump from chamber or transformer overflow

  • Rotary vane backing vacuum pump
  • Direct drive Roots style rotary lobe pump vacuum booster pump

Local Instrumentation 

  • Inlet Suction Gauge
  • Inlet Temperature Gauge
  • Filter Inlet & Outlet Gauges
  • Dirty Filter Gauges
  • Chamber Manifold Vacuum Gauge
  • Discharge Pressure Gauge
  • Discharge Temperature Gauge
  • Flow Rate Meter
  • Dual Register Positive Displacement Flow Totaling Meter

Standard Instrumentation

  • Inlet Temperature
  • Inlet Suction
  • Chamber Vacuum
  • Aux Vacuum Line Vacuum
  • Outlet Pressure
  • Outlet Temperature
  • Inlet Temperature Control
  • Discharge Flow Rate
  • Discharge Flow Total

Electrical System

  • All control packages are built to NEMA and IEC specifications
  • Main Power Disconnect Breaker
  • 100% Circuit Breaker Protection
  • IEC Motor Starters and Overload Protection
  • Circuit Breaker Protected Heater Contactors
  • Individually Controlled Banked Heaters
  • System Hour Meter
  • Vacuum Pump Hour Meter
  • Alarm Horn
  • Amp Meter
  • Phase Indicator

Standard Control System

  • A NEMA 4,  push button and pilot operator interface is used to provide pump, heating system, and automatic valve control. Pumps, heaters, and automatic valves status by pilot lights. The system incorporates a 7" color operator interface  for alarm annunciation, alarm logging,  and troubleshooting. Data logging is optional. optional.

HMI Displayed Instrumentation:

  • Status & Control Displays:
    • All Motors
    • All Heater Banks
    • All Actuated Valve Positions
    • All Alarms
    • All Warnings
    • Oil Temperature Set Point
  • HMI Displayed Instrumentation:
    • Inlet Pressure
    • Outlet Oil Flow Rate
    • Outlet Out Total Gallons
    • Outlet Pressure
    • Degas Chamber Vacuum Level
    • External Vacuum Line Vacuum Level
    • Heater Outlet Temperature


  • Skid mounted with a recessed deck plate for drip collection.
  • System design facilitates easy access for maintenance and operation.
  • Piping
    • All oil piping is welded carbon steel w/ butt weld or socket fittings. All vapor and water piping is stainless steel with w/ but weld or socket weld fittings. Maintenance connections use bolted flanges or O-ring sealed unions. Threaded unions are not used. Threaded connections are kept to a minimum.
  • Instrumentation Tubing
    • Oil filled tubing is 1/4" carbon steel w/ carbon steel compression fittings.
  • Electrical Conduit
    • A combination of ridged and liquid tight flexible conduit is used to provide a water tight easy maintenance wiring system

Oil Pumping System

  • Inlet oil booster pump for evacuated transformer circulation

Filtration System

  • Dirty filter alarms
  • Oversized inlet housing

Vacuum System

  • Fail-safe external vacuum line actuated valve


  • Remote Transformer Vacuum Gauge (760 torr – 0.01 torr)
  • Inlet Moisture & Temperature Monnitor
  • Outlet Moisture & Temperature Moitor
  • External Vacuum Line Dew Point Monitor

Control Package

  • Data logging

The SES320-600C is a mobile cargo trailer mounted system 


  • Skid Mounting
    Built-to-order skid-mounted equipment can normally be built to meet customer footprint and access requirements.  Consult SESCO with special requests.
  • Cargo Trailer Mounting
    All cargo trailers are specifically engineered to accommodate equipment load, weight distribution, to provide optimum towing conditions. Cargo trailer weight capacities (GVRW) range from 4,000 to 16,000 Lbs. SESCO will provide the cargo trailer size and weight capacity options available for the system being quoted.

SES320-600C Trailer Specification

  • Length
    • 16’ OAL 
    • 12’ compartment length
  • Bumper Hitch 
    • Ball or pintle ring
  • Cargo Trailer 
  • Enclosed Tandem Axle Bumper Hitch
  • Width
    • 90” OAW
    • 72” Compartment width
  • Height 
    • 105” OAH
    • 80” Interior height
  • Axles 
    • Dual 7000 Lbs w/ Tor-flex suspension
  • Weight
    • GVRW 9500 Lbs 
    • SES320-600C curb weight 6900 Lbs 
  • Brakes 
    • Electric drum
  • Construction
    • Steel tubular main beams
    • Aluminum roof
    • Steel diamond plate over Drymax subfloor 
    • Aluminum sheet & post sidewalls
    • Lined interior sidewalls 
    • DOT LED lighting
    • Radial tires w/ spare
    • (2) Full swing rear doors w/ double locking cams 
    • (1) 28” x 78” Curbside entry door
  • Oil Connection Options
    • Single or dual rear 
  • Vacuum Connection Options
    • Single rear door accessible
  • Steps
    • (2) Heavy duty aluminum step assemblies
  • Ventilation
    • (1) 16” 115V flush mount ventilation fan / intake louver assembly 
  • LED Lighting
    • (2) Exterior flush wall mount flood
    • (2) Interior ceiling mount 
  • 120V/1PH Power
    • Load center circuit breaker controlled
    • (2) Exterior GFIC Outlets (1) 15 circuit
    • (3) Interior GFIC Outlets (1) 15 circuit

Trailer Dress Out Options 

  • Heating
    • (1) Three phase 5 KW forced air heater w/ thermostat