Double-stage vacuum oil treatment plants are not equipped with an oil feed pump. Their oil drain pump is a gear pump and the gas extraction system is a combination of a rotary-vane vacuum pump and Roots pump. In addition, the oil treatment plant is equipped with an evacuation interface to connect to the external vessel, which is used as a vacuum group.
Oil filtration indexes:
- After one treatment, the moisture content is ≤ 4±2 ppm; the gas content, ≤ 0.1 %