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Hydraulic System Upgrades
GE large steam turbine, Electro-hydraulic fluid systems currently
utilize either Vickers or Dennison high pressure fluid pumps. These
pumps, which were supplied with the original hydraulic power unit
are slow to respond to
system demand. This slow response (1-3 seconds from no flow to full
flow) causes many problems with the control system. The most pronounced
problems occur during valve tests, causing major swings in manifold
pressure and could cause the turbine to trip.
Many utility stations who currently use these pumps have experienced
problems as the pumps show signs of age. GE distributed a TIL (Technical
Information Letter) #1115-3R1 in 1992. The TIL states that the Vickers
PV2032 and PV2050 hydraulic pumps have both been discontinued. MD&A
Control Systems Division, in conjunction with Rexroth, the worlds
largest supplier of hydraulic components, offers a replacement kit
for both the Vickers and Dennison hydraulic pumps.
Replacement consist of removing both inlet suction strainers, replacing
both existing high pressure fluid pumps and motors. In addition,
a special pump/motor mounting assembly is added which positions
the new pump well below the fluid level on the outside of the reservoir.
To mount the new pumps the existing space heaters are replaced by
state-of-the-art tank heating pads that interface to the existing
thermostat control. The pump discharge piping up to the inlet of
the Pall Discharge Filter will also be replaced, including both
of the existing relief valves. Two discharge line-isolation valves
are also added between each Pall Discharge Filter and the manifold
check valves. All piping and fittings being added to the system
are welded stainless steel.
In addition to the parts and pieces, we provide one on-site Technical
Director who provides instructions to properly install and start-up
the new system. The modification can be completed within five, ten-hour
shifts with the unit off-line and the reservoir drained (no EHC
flush will be required following installation.) Following the installation
and startup of the upgraded system an EHC system hydraulic fluid-flow
analysis is conducted. Our price includes the replacement of both
pumps, motors relief valves, and space heaters, including installation
technical direction and an EHC system hydraulic fluid-flow analysis.
Shipping, travel and living expenses are the only additional charges.
Installation Kits Available:
- AA10VSO-100 (Replaces Vickers PV2032 and Denison PVO9XS-032
pumps)
- AA10VSO-140 (Replaces Vickers PV2050 and Denison PVO9XS-053
pumps)
Spare Parts Available:
- AA10VSO-100 Pump
- AA10VSO-140 Pump
- Bosch Rexroth DB5X Relief Valve
- Baldor 40HP Motor
- Baldor 60HP Motor
For more information on MD&A Control Systems' products and
services, please call (970) 224-2223 Ext. 140 or email: amcneill@mdaturbines.com
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