The lobe count isn’t the same on each rotor so it works out. Probably an industrial compressor of some sort. They work well in high turn-down applications And are lower maintenance than recip compressors.
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...boy, someone really screwed up this rig job...;)...https://scontent-atl3-1.xx.fbcdn.net...4A&oe=6408FF96
...left turn clyde...https://scontent-atl3-1.xx.fbcdn.net...ww&oe=640934C8
...break time...https://scontent-atl3-1.xx.fbcdn.net...ZA&oe=640917E8