Hydraulic Power Supply
The hydraulic power supply is located between the nees@berkeley laboratory and the PEER Earthquake Simulator Laboratory and it provides oil to each building. The oil is delivered by 4 Denison 60 series pumps capable of 80 gpm each at steady state. The pumps are configured to be pressure compensating, delivering such volume as demand requires. The pumps may be run individually or altogether and are fed by superchargers which supply oil at a fixed displacement to the Denison pumps. The system uses a 1500 gallon reservoir. The oil is cooled by offline circulation through a heat exchanger. The oil is filtered inline at the output of the superchargers and offline through the heat exchanger. Additional filtering is done down line at the service manifolds.
The sudden demands that can be made by large dynamic servo valves require that a large volume of accumulated oil under pressure be available. The power supply uses a a 500 gallon bank of supply accumulators and a 100 gallon bank of return line accumulators. The return line accumulators are to reduce back pressure.
Accumulators
There are ten 50 gallon piston type accumulators that make up the stored energy availible to the NEES laboratory. The accumulators are typically precharged with 2,000 psi of nitrogen. In addition there are two 50 gallon accumulators that serve to reduce back pressure during sudden discharges of oil. The accumulators are manufactured by Tobul Accumulator Inc.
(model 14.3A30-400A691).
Service Manifolds
There are nine hydraulic service manifolds that line the south wall of the laboratory. Three of these manifolds are a low flow type intended for use with the three static actuators. To achieve the maximum flow of the MTS 244.51 actuators it is recommended that two of the high flow service manifolds be used together. The configuration allows all seven MTS actuators to be connected at once.
More information is available from the MTS Model 293.32 Hydraulic Service Manifold Product Information Manual.
