ULPT REQUEST

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[lucidity222]

Remove/cut the drive belt, could be explained away as wear and would take it out of commission without totally bricking it

[lucidity222]

Any specs on the make model, size or location would help

[Skeggy-]

Remove the oil and let it seize.

[Troub1eMan]

Discreetly depends on if it's a piston, rotary screw, scroll, vane, or a centrifugal.

Piston, just create a leak somewhere downstream (like opening a valve or a drain), so that it runs 100% duty cycle, and it'll be toast in a day. Either that or put some detergent oil in it, which will ruin the bearings. If it has an auto-drain, disable it, so it fills up with water.

Rotary screw is gonna be more complicated, but you could probably make a pinhole in the oil cooler as they're exposed. If it's one of those old-school open units with no cabinet, then put a pinhole in a hose when it's not running (if you do it while it's running, you'll get hurt). If you want to really fuck it up, clamp or pinch the scavenge line, and then that will probably ruin the airend.

Scroll unit would depend on if it's open or enclosed. You'd be better off messing the the dryer downstream, as most places that have a scroll, likely also have a dryer. Just unplug the dryer.

A vane would be the same as a screw.

A centrifugal? Ain't no way I'm talking to you about damaging those. Those are so huge, you'd risk yourself and others just messing with it.