Vacuum Pressure Impregnation

World Wide Power Services FZCO (WWPS) are pleased to announce that our newly installed Vacuum Impregnation Plant is fully operational at our Jebel Ali facility.

VPI
VPI

VPI System Specification

Varnish Chamber 2.5 dia x 2 m length
Storage Vessel 2.5 dia x 2 m length
Vacuum Pump Single stage Pump, pumping speed of 280 m3/hr and ultimate vacuum will be 8 x 10 mbar
Water Chilling Unit 5 TR

Vacuum Pressure Impregnation (VPI) is a process that uses vacuum and pressure to seal porous materials with varnish or resin. The process is used primarily for high-voltage motors and generators to fill gaps in materials to create a void free insulation in various devices.

Industrial electromechanical equipment is designed for durability to provide reliable function and increased longevity, but age, temperature, and environmental factors can degrade porous metals over time. The process of impregnation seals porous materials with varnish or resin, improving the function and longevity of equipment.

The Vacuum Pressure Impregnation Process WWPS specializes in vacuum pressure impregnation, which is more effective than traditional dip-and-bake methods and is better suited to high voltage motors and generators. Our basic vacuum pressure impregnation motor repair process comprises several steps.

Preheating We place the equipment in an oven that heats the equipment and allows moisture to evaporate. This helps the resin better penetrate the material.
Dry Vacuuming We remove the equipment from the oven and place it into a vacuum chamber, which removes air and any remaining moisture.
Filling We fill the chamber with resin, coating the part and filling in all the gaps and pores in the piece of equipment.
Wet Vacuuming We reduce the vacuum levels and hold it for a set period of time.
Pressure We increase pressure within the chamber using dry air, nitrogen, or other gases. This allows for even deeper penetration of the resin.
Draining We then vent the pressure, drain the chamber of excess resin, and remove the part.
Curing Finally, the equipment is placed into an oven to cure the resin.

The Benefits of VPI In traditional impregnation, varnishes can lose up to 50% of their volume in the curing process. The reduced volume leads to air pockets and gaps, making it more susceptible to damage and wear. The vacuum used in a VPI creates a more solid structure that can withstand: Leaks, Cracks, Corrosion, Moisture.

VPI also accommodates longer insulation life and greater heat dissipation. Vacuum pressure impregnation is a more cost-effective solution as it extends the lifetime of products while saving energy.