As an additional precaution, the first length of outlet pipe work to the after coolers was supported on anti-vibration matting. ![]() Each compressor unit was installed on ‘Vulcascot’ anti-vibration matting and was isolated from the discharge pipe work by means of a flexible pipe work connector. Each unit is driven by a 150 HP 1440 RPM induction motor controlled by an auto-transformer started capable of up to 15 starts per hour. Each compressor maximum pressure ratings is 100 psig for continuous operation and 115 psig for intermittent operation such as that required for use with supersonic wind tunnels. ![]() ![]() Two Holman RO600S screw type compressors, each rated at 600 cubic feet per minute of free air each and capable of operation separately to provide a mass flow of 0.75 lb/sec or in parallel for an output of 1.5 lb/sec were acquired. From a consideration of vibration and intake resonance of the machines and also to provide significantly larger outputs per unit cost, it was decided to use rotary compressors.
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