THERMOJET
®
G-3700E SERIES
OIL PURIFIER SYSTEM
INSTALLATION AND OPERATING MANUAL
Doc #
77740151
Rev
03
Date
June 2020
Page
16
of
111
Principal of Operation
The ThermoJet Oil Purifier works on the principal of air stripping. The use of air or nitrogen
bubbled through contaminated liquids has long been used to remove contaminants. But the
use of this technique was restricted because the volume of gas required was large due to
limited mixing of the gas with the liquid. The unique technology embodied by the ThermoJet
makes air/gas stripping practical and efficient because of the mixing and intimate contact of
the air/gas with the fluid being cleaned. In addition, the ThermoJet
utilizes the principal that
the capacity of a gas to entrain moisture increases exponentially with temperature.
The ThermoJet is designed to operate on ISO 32 through ISO 220 oils from circulating oil
systems. Oil with higher viscosity (ISO 150 and ISO 220) must be at 40
o
C (100
o
F) minimum
temperature at the inlet to the ThermoJet during start-up.
Degasification
The ThermoJet
®
removes dissolved light hydrocarbon gases such as propane and H
2
S from
industrial lubricants. In refineries and petrochemical plants an ideal application for the
ThermoJet
is the removal of hydrogen sulfide from compressor seal oil. The ThermoJet
returns
the viscosity of the lube oil and restores the oil flash point to like new levels. No longer is there
a need to dispose of gas laden and sour lube oils; these oils can be purified and reused.
Flow through the Unit
The suction pump of the ThermoJet
draws contaminated oil from the user lube, seal or
hydraulic system. Flexible hose or hard piping can be used to connect the ThermoJet
to the
system reservoir. A one and one half horsepower motor drives the suction pump. The suction
pump is protected by a “Y” strainer. From the pump the oil passes through a filter. This
cartridge filter can be easily replaced. It is recommended replacement be made when the
pressure differential across it, as monitored by two easily read gages which are externally
mounted on the panel above the access door, reaches 2 BAR ( 30 PSI). From the filter the
oil passes through the heater that elevates the oil to 82° C (180° F).
The electric heater temperature is set and controlled with a solid-state device whose
operation is viewed through a window on the electrical control box. After the heater, the oil
passes through the heart of the ThermoJet
which is the dual stage jet mixer
The Jet Mixer
This proprietary and uniquely designed device is the heart of the system. Without the aid of
secondary pressure, it continuously and automatically draws ambient air or inert gas such as
nitrogen into the heated oil stream as delivered to it by the inlet pump. The ambient air/gas
becomes intimately mixed with the oil and assumes the temperature of the oil. The oil leaves the
Jet Mixer and is directed to the separation vessel that operates at atmospheric pressure. Here
the moisture laden air, or gas saturated nitrogen, expands and leaves the oil thus cleansing
the oil of water or dissolved hydrocarbon gases.
Return of Clean Oil
In the separation vessel the oil from the jet mixer cascades down trays to promote the release
of the saturated air/gas. A volume of oil is maintained in the lower portion of the separation
vessel to allow any entrained air to leave the oil so that none is contained in the return oil
stream. The second close coupled pump driven by the electric motor returns oil to the user
reservoir. Water vapor vents from the separation vessel and travels through a filter and oil
absorbing media to insure that discharge from the unit is oil free. The water condensate
discharged from the ThermoJet
can be piped to a sanitary sewer.
Mounting Options
The ThermoJet Model G3700
Oil Purifier is offered in two different mounting configurations so that
the unit can best fit client requirements. All series units are available as base mounted with lifting
eyes. The H-2000 series is also available mounted on a fork lift able base.
