Data Sheet

Bulletin 71.4:MR108
7
• Auxiliary pump (Pump 2) and lter system is brought
into operation while main pump is in operation.
• Auxiliary pump ramp up rate is one second.
• Auxiliary pump produces a pressure spike
that is beyond the limitations of the pressure
reducing regulator.
• The backpressure regulator relieves the excess
pressure back to the oil tank. Flow rate is 120% of
total pump rate.
Main pump can now be shut down to allow repair of
the system. High capacity direct-operated regulators
are recommended for this type of application where
speed of response is critical. The Type MR108 can
provide fast response to the pressure spikes as
described above while maintaining a constant delivery
pressure of oil to the bearing.
UniversalNACECompliance
Optional materials are available for applications
handling sour gases. These constructions comply with
the recommendations of NACE International Sour
Service Standards.
The manufacturing processes and materials used
by Regulator Technologies assure that all products
specied for sour gas service comply with the
chemical, physical and metallurgical requirements of
NACE MR0175 and/or NACE MR0103. Customers
have the responsibility to specify correct materials.
Environmental limitations may apply and shall be
determined by the user.
Figure 3. Lube Oil Skid Diagram
LubeOilSkids(Figure3)
Lube oil skids maintain oil ow to bearings, seals and
servo-controls on critical turbomachinery assets such
as air and gas compressors, steam turbines, power
recovery turbines and power generating equipment.
These skids are essential in keeping lube oil clean
at all times and ensure maximum service life for the
equipment. Because it is critical to maintain a constant
ow and pressure of oil to the equipment, it is normally
equipped with two pumps – the main pump and the
auxiliary pump, which will take over in case of main
pump failure – and lters.
In normal condition, the skids operate in the
following manner:
• Lube oil is stored in the tank at atmospheric pressure.
• It is then fed to the main pump (Pump 1) which
pressurizes the lube oil.
• Oil then goes through a lter.
• After ltration, oil ow is split such that a fraction is
sent to a backpressure regulator to limit the supply
pressure to the pressure reducing regulator. 20%
of the pump rate ows through the backpressure
regulator, sending back oil to the oil tank.
• The pressure reducing regulator decreases the
pressure to a safe and allowable range. Flow
through this regulator is 80% of pump rate.
• Oil ows to large rotating equipment lubricating
bearings, e.g. turbines and compressors.
The loss of pressure or ow to the bearings or these
turbomachinery assets may shut down the equipment
or even the whole plant. Failure of the main pump or
lter results in the following upset operation:
OILTANK
TOEQUIPMENT
BEARINGS,SEALSOR
SERVO-CONTROLS
PUMP1
PUMP2
TYPEMR108
BACKPRESSUREREGULATOR
TYPEMR105PRESSURE
REDUCINGREGULATOR
FILTER2
FILTER1