Inlet Oil Booster Pumps
SESCO SES330 series inlet oil booster pumps are low pressure, low suction head, portable booster pumps designed to assist oil processors when circulating oil through a partially filled transformer being held under full vacuum. The SES330 is available in centrifugal and positive displacement pump versions.
SES330 Highlights
- Centrifugal and Positive Displacement Configurations
- 15 PSI Maximum Discharge Pressure
- Operates Under Full Transformer Vacuum
- Inlet and Discharge Shutoff Valves
- Inlet and Discharge Compound Gauges
- Discharge Flow Sight
- NEMA 4 Starter Enclosure
- 50' to 75' Power Cable
- 230/460/3/60 Power
- Portable, Compact Designs

SESCO SES330 series inlet oil booster pumps are designed to assist insulating oil processors when circulating oil through partially filled transformers held under full vacuum. Both centrifugal and positive displacement versions are available to match processing requirements.
Performance Overview
| SES330S Centrifugal | SES330PD Positive Displacement | |
|---|---|---|
| Pump Type | Multistage Centrifugal | Positive Displacement Gear |
| Flow Rate | 5 - 45 GPM | 20 - 45 GPM |
| Pressure Out | 15 PSI | 7.5 - 20 PSI Adjustable |
| Suction Head Requirement | 36" Minimum @ 45 GPM | 36" Minimum @ Rated Flow |
| Voltage | 230/460/3/60 | 230/460/3/60 |
SES330S-2400-C-AL-SE | Centrifugal Model
The SES330S-2400 utilizes a special multistage suction centrifugal pump to supply up to 45 GPM with only 36" of oil suction head while the transformer is under full vacuum.
images/Sesco_Products/SES330/S/SES330S_500x500-min.png
Features
- All Aluminum Frame Construction - 140 lbs
- 12" W x 35.5" D x 16" H
- 5 - 45 GPM Adjustable Flow Rate
- 15 PSI Maximum Discharge Pressure
- 30-36" Oil Head Required
Operating Conditions
| Minimum Ambient Temperature | > 0°F / -17.7°C |
| Maximum Ambient Temperature | 115°F / 46.1°C |
| Minimum Oil Temperature | > 0°F / -17.7°C |
| Maximum Oil Temperature | 210°F / 98.9°C |
Specifications
| Pump Type | Multistage Centrifugal |
| Flow Rate | 5 - 45 GPM |
| Pressure Out | 15 PSI |
| Suction Connection | 2" Female Cam |
| Discharge Connection | 2" Male Cam |
| Voltage | 230/460/3/60 |
| Power Cord | 50 ft / 15 m |
SES330PD-2400 | Positive Displacement Model
The SES330PD inlet oil booster pump is a low NPSH, low speed positive displacement booster pump designed for circulation through a partially filled transformer under full vacuum.
images/Sesco_Products/SES330/PD/SES330PD_500x500-min.png
Features
- 20, 30, and 40 GPM Versions
- 15 PSI Maximum Pressure
- 30"-36" Oil Head Required
- 50' Power Cable
- Steel Frame Construction - 425 lbs
Operating Conditions
| Minimum Ambient Temperature | > 0°F / -17.7°C |
| Maximum Ambient Temperature | 115°F / 46.1°C |
| Minimum Oil Temperature | > 0°F / -17.7°C |
| Maximum Oil Temperature | 210°F / 98.9°C |
Specifications
| Pump Type | Positive Displacement Gear |
| Flow Rate | 20-45 GPM |
| Pressure Out | 7.5-20 PSI Adjustable |
| Inlet Connection | 2" Female Cam |
| Discharge Connection | 2" Male Cam |
| Voltage | 230/460/3/60 |
| Power Cord | 50 ft / 15 m |
Downloads
index.php?option=com_docman&view=document&alias=93-ses330s-datasheet&category_slug=email&Itemid=350 SES330S DATASHEET