LUBRICATION OIL, CONTROL AND HYDRAULIC OIL SYSTEM
TURBINE OIL SPECIFICATION
Function
‒Turbine oil is defined as a mineral oil or synthetic oil
with additives which enhance corrosion protection and degradation resistance.
Turbine oils used for gearbox lubrication may also contain additives which
increase load carrying capacity and reduce wear.
‒As a rule, turbine oil is a paraffin-base mineral oil
comprising a mixture of saturated hydrocarbons. Because of the numerous
chemical constituents involved, it is not possible to state a defined
composition. The physical properties of the oil are the selection criteria for
choosing a turbine oil. The additives shall not have any adverse effect on the
materials used in the oil system. Additives shall not contain any
organo-metallic compounds (e.g., organic zinc compounds).
Viscosity
‒Viscosity grade ISO VG 32 and ISO VG 46 is used (the
viscosity grade specified is dependent on the gas turbine model in question).
Prior approval from the Siemens engineering departments is required if oils
with other viscosity grades are to be used.
Turbine Oils With Normal Thermal Stability:
The turbine oil must be capable of withstanding temperatures
of up to 110 °C in machine components (e.g., bearings, clutch, and gearbox) and
up to 80 °C in the oil tank with no negative impact on the properties of the
oil.
Compatibility
The fluids must be capable of mixing with residues (max. 4
vol. %) of another similarly based product (mineral or synthetic) with no
negative impact on the properties of the oil.
Physiological Properties
By nature, the turbine oil must not be hazardous to the
health of the persons working with it, provided the necessary hygienic
precautions are taken.
Type Of Hydraulic Oil
‒ The minimum
requirements which hydraulic oil must meet are stipulated in DIN 51524 Part 2.
‒ Requirement:
Grade HLP 46 hydraulic oil per DIN 51524 & Grade ISO-L-HM 46 hydraulic oil
per ISO 6743-4.
Chemical Composition
‒ For the
purposes of this specification, hydraulic oil is defined as a mineral-oil-base
liquid pressure medium, having additives which enhance protection against
oxidation, corrosion, and wear, and exhibit good emulsification performance,
i.e. resistance to emulsification. The additives shall not have any adverse
effect on the materials used in the hydraulic system. Additives shall not
contain any organometallic compounds (e.g. organic zinc compounds). The use of
hydraulic fluids that attack lead or bearing shell alloys which contain lead is
not permitted even if these materials meet the requirements of the HLP
specification per DIN 51524 Part 2.
‒ If the terms of
a contract call for the use of hydraulic fluids which do not correspond to
these requirements, approval must be obtained from the respective engineering
departments.
Thermal Stability
‒ The hydraulic
oil must be capable of withstanding temperatures of up to +70°C in the
hydraulic oil tank with no negative impact on the properties of the fluid.
Compatibility
‒ If hydraulic
fluids from different manufacturers or different types from one manufacturer
are mixed, sludge and deposits may form. These may cause faults in and damage
to the hydraulic system. For this reason, mixing different types of hydraulic
fluid is strictly forbidden. The only exception to this is the compatibility of
the hydraulic fluid with residues (max. 2vol.%) of another hydraulic fluid with the same mineral
base.
Physiological Properties
‒ By nature, the
hydraulic oil must not be hazardous to the health of the persons working with
it, provided the necessary hygienic precautions are taken.
LUBE AND JACKING OIL SYSTEM
Lube and Jacking Oil System
Lube oil system and jacking oil system for gas turbine and Steam turbine
are common.
Lube Oil System
-The lubricating oil system has the following
process engineering functions:
Lubrication and cooling of the turbine and generator bearings with
turbine oil drawn from the main oil tank by the oil pumps and forwarded via
cooler and filter to the bearings; pressures and flow rates are set with
throttle valves.
Supplying the turning gear and freewheel clutch with lubricating oil.
Backflow of the turbine oil to the main oil tank.
-Components of the
lubricating oil system
In addition to piping, manually operated valves and monitoring equipment,
the following tanks, pumps, drives, coolers, filters and valves are necessary
for operation of the lubricating oil system:
- Main oil tank and oil pumps
‒ Main Oil Tank
‒ Full-load Oil
Pump 1 (A.C motor)
‒ Full-load Oil
Pump 2 (A.C motor)
‒ Emergency Oil
Pump (D.C motor)
‒ Main Oil Tank
Heating
‒ E-Motor with
gear and freewheel clutch.
‒ Solenoid valve
turning gear clutch
‒ Lubricating oil
throttle valve .
‒ Oil Cooler 1
.
‒ Oil Cooler 2
.
‒ Double
Multiport Butterfly Valve
‒ Oil Temperature
Control Valve
‒ Lubricating Oil
Filter 1
‒ Lubricating Oil
Filter 2
‒ Double
Multiport Butterfly Valve
0 commentaires:
Enregistrer un commentaire