Accumulators

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A weighted hydraulic accumulator system was an additional safety feature that would insert all seven shim rods completely into the pile to facilitate a shut down when the safety circuit was triggered. The accumulators stored oil under high pressure, similar to the hydraulic lift used to elevate a car in an auto repair shop. To scram the pile in the event of a power outage or other pile-threatening event, the weight of the accumulators would pump the oil to insert the shim rods into the pile at the relatively fast rate of 30 in. per second.