Good evening David g... The last Recp. Compressor station I was involved with had two monster Clark V-16's.. There were six pipes, 30" diameter .375 wall X 50' long buried in the ground. These storage Vessels/ Pipes were maintained at 240 PSI Air pressure.
When a start sequence was initiated on one of the Clarks, the Engine would start to turn over on starting air...how long and at what RPM evades me now. I would say probably the unit was on starting air for at least 20>45 RPM's. At some point after 20>45 RPMs the AIR assist on both TURBOS would energize.
As starting air was still turning the engine over, both TURBOS were also being spooled up on starting air. With the ignition energised, fuel enabled to the engine, ignition retarded (2 STROKE ENGINE)the turbo assist had to stay energized to the turbos until the engine was placed on load. When the governor started to increase fuel, heat was produced to sustain Turbos. Turbo assist air was then shut off.
As long as ENGINE was NOT UNDRELOAD the TURBO assist had to be maintained.
If unit had a failed start / load sequence, there was ONLY one more air volume left to try the second start.
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